diff --git a/.gitignore b/.gitignore
index 6b2d6fc97b..8fda9f2980 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,6 @@ cmake_build
 *.lo
 *.tar.gz
 *.log
+.coverage
+*.pyc
+cov_html/
diff --git a/shards/Dockerfile b/shards/Dockerfile
new file mode 100644
index 0000000000..594640619e
--- /dev/null
+++ b/shards/Dockerfile
@@ -0,0 +1,10 @@
+FROM python:3.6
+RUN apt update && apt install -y \
+    less \
+    telnet
+RUN mkdir /source
+WORKDIR /source
+ADD ./requirements.txt ./
+RUN pip install -r requirements.txt
+COPY . .
+CMD python mishards/main.py
diff --git a/shards/build.sh b/shards/build.sh
new file mode 100755
index 0000000000..fad30518f2
--- /dev/null
+++ b/shards/build.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+BOLD=`tput bold`
+NORMAL=`tput sgr0`
+YELLOW='\033[1;33m'
+ENDC='\033[0m'
+
+echo -e "${BOLD}MISHARDS_REGISTRY=${MISHARDS_REGISTRY}${ENDC}"
+
+function build_image() {
+    dockerfile=$1
+    remote_registry=$2
+    tagged=$2
+    buildcmd="docker build -t ${tagged} -f ${dockerfile} ."
+    echo -e "${BOLD}$buildcmd${NORMAL}"
+    $buildcmd
+    pushcmd="docker push ${remote_registry}"
+    echo -e "${BOLD}$pushcmd${NORMAL}"
+    $pushcmd
+    echo -e "${YELLOW}${BOLD}Image: ${remote_registry}${NORMAL}${ENDC}"
+}
+
+case "$1" in
+
+all)
+    [[ -z $MISHARDS_REGISTRY ]] && {
+        echo -e "${YELLOW}Error: Please set docker registry first:${ENDC}\n\t${BOLD}export MISHARDS_REGISTRY=xxxx\n${ENDC}"
+        exit 1
+    }
+
+    version=""
+    [[ ! -z $2 ]] && version=":${2}"
+    build_image "Dockerfile" "${MISHARDS_REGISTRY}${version}" "${MISHARDS_REGISTRY}"
+    ;;
+*)
+    echo "Usage: [option...] {base | apps}"
+    echo "all,      Usage: build.sh all [tagname|] => {docker_registry}:\${tagname}"
+    ;;
+esac
diff --git a/shards/conftest.py b/shards/conftest.py
new file mode 100644
index 0000000000..34e22af693
--- /dev/null
+++ b/shards/conftest.py
@@ -0,0 +1,27 @@
+import logging
+import pytest
+import grpc
+from mishards import settings, db, create_app
+
+logger = logging.getLogger(__name__)
+
+
+@pytest.fixture
+def app(request):
+    app = create_app(settings.TestingConfig)
+    db.drop_all()
+    db.create_all()
+
+    yield app
+
+    db.drop_all()
+
+
+@pytest.fixture
+def started_app(app):
+    app.on_pre_run()
+    app.start(settings.SERVER_TEST_PORT)
+
+    yield app
+
+    app.stop()
diff --git a/shards/manager.py b/shards/manager.py
new file mode 100644
index 0000000000..931c90ebc8
--- /dev/null
+++ b/shards/manager.py
@@ -0,0 +1,28 @@
+import fire
+from mishards import db
+from sqlalchemy import and_
+
+
+class DBHandler:
+    @classmethod
+    def create_all(cls):
+        db.create_all()
+
+    @classmethod
+    def drop_all(cls):
+        db.drop_all()
+
+    @classmethod
+    def fun(cls, tid):
+        from mishards.factories import TablesFactory, TableFilesFactory, Tables
+        f = db.Session.query(Tables).filter(and_(
+            Tables.table_id == tid,
+            Tables.state != Tables.TO_DELETE)
+        ).first()
+        print(f)
+
+        # f1 = TableFilesFactory()
+
+
+if __name__ == '__main__':
+    fire.Fire(DBHandler)
diff --git a/shards/mishards/.env.example b/shards/mishards/.env.example
new file mode 100644
index 0000000000..0a23c0cf56
--- /dev/null
+++ b/shards/mishards/.env.example
@@ -0,0 +1,33 @@
+DEBUG=True
+
+WOSERVER=tcp://127.0.0.1:19530
+SERVER_PORT=19532
+SERVER_TEST_PORT=19888
+
+SD_PROVIDER=Static
+
+SD_NAMESPACE=xp
+SD_IN_CLUSTER=False
+SD_POLL_INTERVAL=5
+SD_ROSERVER_POD_PATT=.*-ro-servers-.*
+SD_LABEL_SELECTOR=tier=ro-servers
+
+SD_STATIC_HOSTS=127.0.0.1
+SD_STATIC_PORT=19530
+
+#SQLALCHEMY_DATABASE_URI=mysql+pymysql://root:root@127.0.0.1:3306/milvus?charset=utf8mb4
+SQLALCHEMY_DATABASE_URI=sqlite:////tmp/milvus/db/meta.sqlite?check_same_thread=False
+SQL_ECHO=True
+
+#SQLALCHEMY_DATABASE_TEST_URI=mysql+pymysql://root:root@127.0.0.1:3306/milvus?charset=utf8mb4
+SQLALCHEMY_DATABASE_TEST_URI=sqlite:////tmp/milvus/db/meta.sqlite?check_same_thread=False
+SQL_TEST_ECHO=False
+
+# TRACING_TEST_TYPE=jaeger
+TRACING_TYPE=jaeger
+TRACING_SERVICE_NAME=fortest
+TRACING_SAMPLER_TYPE=const
+TRACING_SAMPLER_PARAM=1
+TRACING_LOG_PAYLOAD=True
+#TRACING_SAMPLER_TYPE=probabilistic
+#TRACING_SAMPLER_PARAM=0.5
diff --git a/shards/mishards/__init__.py b/shards/mishards/__init__.py
new file mode 100644
index 0000000000..7db3d8cb5e
--- /dev/null
+++ b/shards/mishards/__init__.py
@@ -0,0 +1,36 @@
+import logging
+from mishards import settings
+logger = logging.getLogger()
+
+from mishards.db_base import DB
+db = DB()
+
+from mishards.server import Server
+grpc_server = Server()
+
+
+def create_app(testing_config=None):
+    config = testing_config if testing_config else settings.DefaultConfig
+    db.init_db(uri=config.SQLALCHEMY_DATABASE_URI, echo=config.SQL_ECHO)
+
+    from mishards.connections import ConnectionMgr
+    connect_mgr = ConnectionMgr()
+
+    from sd import ProviderManager
+
+    sd_proiver_class = ProviderManager.get_provider(settings.SD_PROVIDER)
+    discover = sd_proiver_class(settings=settings.SD_PROVIDER_SETTINGS, conn_mgr=connect_mgr)
+
+    from tracing.factory import TracerFactory
+    from mishards.grpc_utils import GrpcSpanDecorator
+    tracer = TracerFactory.new_tracer(config.TRACING_TYPE, settings.TracingConfig,
+                                      span_decorator=GrpcSpanDecorator())
+
+    from mishards.routings import RouterFactory
+    router = RouterFactory.new_router(config.ROUTER_CLASS_NAME, connect_mgr)
+
+    grpc_server.init_app(conn_mgr=connect_mgr, tracer=tracer, router=router, discover=discover)
+
+    from mishards import exception_handlers
+
+    return grpc_server
diff --git a/shards/mishards/connections.py b/shards/mishards/connections.py
new file mode 100644
index 0000000000..618690a099
--- /dev/null
+++ b/shards/mishards/connections.py
@@ -0,0 +1,154 @@
+import logging
+import threading
+from functools import wraps
+from milvus import Milvus
+
+from mishards import (settings, exceptions)
+from utils import singleton
+
+logger = logging.getLogger(__name__)
+
+
+class Connection:
+    def __init__(self, name, uri, max_retry=1, error_handlers=None, **kwargs):
+        self.name = name
+        self.uri = uri
+        self.max_retry = max_retry
+        self.retried = 0
+        self.conn = Milvus()
+        self.error_handlers = [] if not error_handlers else error_handlers
+        self.on_retry_func = kwargs.get('on_retry_func', None)
+        # self._connect()
+
+    def __str__(self):
+        return 'Connection:name=\"{}\";uri=\"{}\"'.format(self.name, self.uri)
+
+    def _connect(self, metadata=None):
+        try:
+            self.conn.connect(uri=self.uri)
+        except Exception as e:
+            if not self.error_handlers:
+                raise exceptions.ConnectionConnectError(message=str(e), metadata=metadata)
+            for handler in self.error_handlers:
+                handler(e, metadata=metadata)
+
+    @property
+    def can_retry(self):
+        return self.retried < self.max_retry
+
+    @property
+    def connected(self):
+        return self.conn.connected()
+
+    def on_retry(self):
+        if self.on_retry_func:
+            self.on_retry_func(self)
+        else:
+            self.retried > 1 and logger.warning('{} is retrying {}'.format(self, self.retried))
+
+    def on_connect(self, metadata=None):
+        while not self.connected and self.can_retry:
+            self.retried += 1
+            self.on_retry()
+            self._connect(metadata=metadata)
+
+        if not self.can_retry and not self.connected:
+            raise exceptions.ConnectionConnectError(message='Max retry {} reached!'.format(self.max_retry,
+                                                                                           metadata=metadata))
+
+        self.retried = 0
+
+    def connect(self, func, exception_handler=None):
+        @wraps(func)
+        def inner(*args, **kwargs):
+            self.on_connect()
+            try:
+                return func(*args, **kwargs)
+            except Exception as e:
+                if exception_handler:
+                    exception_handler(e)
+                else:
+                    raise e
+        return inner
+
+
+@singleton
+class ConnectionMgr:
+    def __init__(self):
+        self.metas = {}
+        self.conns = {}
+
+    @property
+    def conn_names(self):
+        return set(self.metas.keys()) - set(['WOSERVER'])
+
+    def conn(self, name, metadata, throw=False):
+        c = self.conns.get(name, None)
+        if not c:
+            url = self.metas.get(name, None)
+            if not url:
+                if not throw:
+                    return None
+                raise exceptions.ConnectionNotFoundError(message='Connection {} not found'.format(name),
+                                                         metadata=metadata)
+            this_conn = Connection(name=name, uri=url, max_retry=settings.MAX_RETRY)
+            threaded = {
+                threading.get_ident(): this_conn
+            }
+            self.conns[name] = threaded
+            return this_conn
+
+        tid = threading.get_ident()
+        rconn = c.get(tid, None)
+        if not rconn:
+            url = self.metas.get(name, None)
+            if not url:
+                if not throw:
+                    return None
+                raise exceptions.ConnectionNotFoundError('Connection {} not found'.format(name),
+                                                         metadata=metadata)
+            this_conn = Connection(name=name, uri=url, max_retry=settings.MAX_RETRY)
+            c[tid] = this_conn
+            return this_conn
+
+        return rconn
+
+    def on_new_meta(self, name, url):
+        logger.info('Register Connection: name={};url={}'.format(name, url))
+        self.metas[name] = url
+
+    def on_duplicate_meta(self, name, url):
+        if self.metas[name] == url:
+            return self.on_same_meta(name, url)
+
+        return self.on_diff_meta(name, url)
+
+    def on_same_meta(self, name, url):
+        # logger.warning('Register same meta: {}:{}'.format(name, url))
+        pass
+
+    def on_diff_meta(self, name, url):
+        logger.warning('Received {} with diff url={}'.format(name, url))
+        self.metas[name] = url
+        self.conns[name] = {}
+
+    def on_unregister_meta(self, name, url):
+        logger.info('Unregister name={};url={}'.format(name, url))
+        self.conns.pop(name, None)
+
+    def on_nonexisted_meta(self, name):
+        logger.warning('Non-existed meta: {}'.format(name))
+
+    def register(self, name, url):
+        meta = self.metas.get(name)
+        if not meta:
+            return self.on_new_meta(name, url)
+        else:
+            return self.on_duplicate_meta(name, url)
+
+    def unregister(self, name):
+        logger.info('Unregister Connection: name={}'.format(name))
+        url = self.metas.pop(name, None)
+        if url is None:
+            return self.on_nonexisted_meta(name)
+        return self.on_unregister_meta(name, url)
diff --git a/shards/mishards/db_base.py b/shards/mishards/db_base.py
new file mode 100644
index 0000000000..5f2eee9ba1
--- /dev/null
+++ b/shards/mishards/db_base.py
@@ -0,0 +1,52 @@
+import logging
+from sqlalchemy import create_engine
+from sqlalchemy.engine.url import make_url
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker, scoped_session
+from sqlalchemy.orm.session import Session as SessionBase
+
+logger = logging.getLogger(__name__)
+
+
+class LocalSession(SessionBase):
+    def __init__(self, db, autocommit=False, autoflush=True, **options):
+        self.db = db
+        bind = options.pop('bind', None) or db.engine
+        SessionBase.__init__(self, autocommit=autocommit, autoflush=autoflush, bind=bind, **options)
+
+
+class DB:
+    Model = declarative_base()
+
+    def __init__(self, uri=None, echo=False):
+        self.echo = echo
+        uri and self.init_db(uri, echo)
+        self.session_factory = scoped_session(sessionmaker(class_=LocalSession, db=self))
+
+    def init_db(self, uri, echo=False):
+        url = make_url(uri)
+        if url.get_backend_name() == 'sqlite':
+            self.engine = create_engine(url)
+        else:
+            self.engine = create_engine(uri, pool_size=100, pool_recycle=5, pool_timeout=30,
+                                        pool_pre_ping=True,
+                                        echo=echo,
+                                        max_overflow=0)
+        self.uri = uri
+        self.url = url
+
+    def __str__(self):
+        return '<DB: backend={};database={}>'.format(self.url.get_backend_name(), self.url.database)
+
+    @property
+    def Session(self):
+        return self.session_factory()
+
+    def remove_session(self):
+        self.session_factory.remove()
+
+    def drop_all(self):
+        self.Model.metadata.drop_all(self.engine)
+
+    def create_all(self):
+        self.Model.metadata.create_all(self.engine)
diff --git a/shards/mishards/exception_codes.py b/shards/mishards/exception_codes.py
new file mode 100644
index 0000000000..bdd4572dd5
--- /dev/null
+++ b/shards/mishards/exception_codes.py
@@ -0,0 +1,10 @@
+INVALID_CODE = -1
+
+CONNECT_ERROR_CODE = 10001
+CONNECTTION_NOT_FOUND_CODE = 10002
+DB_ERROR_CODE = 10003
+
+TABLE_NOT_FOUND_CODE = 20001
+INVALID_ARGUMENT_CODE = 20002
+INVALID_DATE_RANGE_CODE = 20003
+INVALID_TOPK_CODE = 20004
diff --git a/shards/mishards/exception_handlers.py b/shards/mishards/exception_handlers.py
new file mode 100644
index 0000000000..c79a6db5a3
--- /dev/null
+++ b/shards/mishards/exception_handlers.py
@@ -0,0 +1,82 @@
+import logging
+from milvus.grpc_gen import milvus_pb2, milvus_pb2_grpc, status_pb2
+from mishards import grpc_server as server, exceptions
+
+logger = logging.getLogger(__name__)
+
+
+def resp_handler(err, error_code):
+    if not isinstance(err, exceptions.BaseException):
+        return status_pb2.Status(error_code=error_code, reason=str(err))
+
+    status = status_pb2.Status(error_code=error_code, reason=err.message)
+
+    if err.metadata is None:
+        return status
+
+    resp_class = err.metadata.get('resp_class', None)
+    if not resp_class:
+        return status
+
+    if resp_class == milvus_pb2.BoolReply:
+        return resp_class(status=status, bool_reply=False)
+
+    if resp_class == milvus_pb2.VectorIds:
+        return resp_class(status=status, vector_id_array=[])
+
+    if resp_class == milvus_pb2.TopKQueryResultList:
+        return resp_class(status=status, topk_query_result=[])
+
+    if resp_class == milvus_pb2.TableRowCount:
+        return resp_class(status=status, table_row_count=-1)
+
+    if resp_class == milvus_pb2.TableName:
+        return resp_class(status=status, table_name=[])
+
+    if resp_class == milvus_pb2.StringReply:
+        return resp_class(status=status, string_reply='')
+
+    if resp_class == milvus_pb2.TableSchema:
+        return milvus_pb2.TableSchema(
+            status=status
+        )
+
+    if resp_class == milvus_pb2.IndexParam:
+        return milvus_pb2.IndexParam(
+            table_name=milvus_pb2.TableName(
+                status=status
+            )
+        )
+
+    status.error_code = status_pb2.UNEXPECTED_ERROR
+    return status
+
+
+@server.errorhandler(exceptions.TableNotFoundError)
+def TableNotFoundErrorHandler(err):
+    logger.error(err)
+    return resp_handler(err, status_pb2.TABLE_NOT_EXISTS)
+
+
+@server.errorhandler(exceptions.InvalidTopKError)
+def InvalidTopKErrorHandler(err):
+    logger.error(err)
+    return resp_handler(err, status_pb2.ILLEGAL_TOPK)
+
+
+@server.errorhandler(exceptions.InvalidArgumentError)
+def InvalidArgumentErrorHandler(err):
+    logger.error(err)
+    return resp_handler(err, status_pb2.ILLEGAL_ARGUMENT)
+
+
+@server.errorhandler(exceptions.DBError)
+def DBErrorHandler(err):
+    logger.error(err)
+    return resp_handler(err, status_pb2.UNEXPECTED_ERROR)
+
+
+@server.errorhandler(exceptions.InvalidRangeError)
+def InvalidArgumentErrorHandler(err):
+    logger.error(err)
+    return resp_handler(err, status_pb2.ILLEGAL_RANGE)
diff --git a/shards/mishards/exceptions.py b/shards/mishards/exceptions.py
new file mode 100644
index 0000000000..72839f88d2
--- /dev/null
+++ b/shards/mishards/exceptions.py
@@ -0,0 +1,38 @@
+import mishards.exception_codes as codes
+
+
+class BaseException(Exception):
+    code = codes.INVALID_CODE
+    message = 'BaseException'
+
+    def __init__(self, message='', metadata=None):
+        self.message = self.__class__.__name__ if not message else message
+        self.metadata = metadata
+
+
+class ConnectionConnectError(BaseException):
+    code = codes.CONNECT_ERROR_CODE
+
+
+class ConnectionNotFoundError(BaseException):
+    code = codes.CONNECTTION_NOT_FOUND_CODE
+
+
+class DBError(BaseException):
+    code = codes.DB_ERROR_CODE
+
+
+class TableNotFoundError(BaseException):
+    code = codes.TABLE_NOT_FOUND_CODE
+
+
+class InvalidTopKError(BaseException):
+    code = codes.INVALID_TOPK_CODE
+
+
+class InvalidArgumentError(BaseException):
+    code = codes.INVALID_ARGUMENT_CODE
+
+
+class InvalidRangeError(BaseException):
+    code = codes.INVALID_DATE_RANGE_CODE
diff --git a/shards/mishards/factories.py b/shards/mishards/factories.py
new file mode 100644
index 0000000000..52c0253b39
--- /dev/null
+++ b/shards/mishards/factories.py
@@ -0,0 +1,54 @@
+import time
+import datetime
+import random
+import factory
+from factory.alchemy import SQLAlchemyModelFactory
+from faker import Faker
+from faker.providers import BaseProvider
+
+from milvus.client.types import MetricType
+from mishards import db
+from mishards.models import Tables, TableFiles
+
+
+class FakerProvider(BaseProvider):
+    def this_date(self):
+        t = datetime.datetime.today()
+        return (t.year - 1900) * 10000 + (t.month - 1) * 100 + t.day
+
+
+factory.Faker.add_provider(FakerProvider)
+
+
+class TablesFactory(SQLAlchemyModelFactory):
+    class Meta:
+        model = Tables
+        sqlalchemy_session = db.session_factory
+        sqlalchemy_session_persistence = 'commit'
+
+    id = factory.Faker('random_number', digits=16, fix_len=True)
+    table_id = factory.Faker('uuid4')
+    state = factory.Faker('random_element', elements=(0, 1))
+    dimension = factory.Faker('random_element', elements=(256, 512))
+    created_on = int(time.time())
+    index_file_size = 0
+    engine_type = factory.Faker('random_element', elements=(0, 1, 2, 3))
+    metric_type = factory.Faker('random_element', elements=(MetricType.L2, MetricType.IP))
+    nlist = 16384
+
+
+class TableFilesFactory(SQLAlchemyModelFactory):
+    class Meta:
+        model = TableFiles
+        sqlalchemy_session = db.session_factory
+        sqlalchemy_session_persistence = 'commit'
+
+    id = factory.Faker('random_number', digits=16, fix_len=True)
+    table = factory.SubFactory(TablesFactory)
+    engine_type = factory.Faker('random_element', elements=(0, 1, 2, 3))
+    file_id = factory.Faker('uuid4')
+    file_type = factory.Faker('random_element', elements=(0, 1, 2, 3, 4))
+    file_size = factory.Faker('random_number')
+    updated_time = int(time.time())
+    created_on = int(time.time())
+    date = factory.Faker('this_date')
diff --git a/shards/mishards/grpc_utils/__init__.py b/shards/mishards/grpc_utils/__init__.py
new file mode 100644
index 0000000000..f5225b2a66
--- /dev/null
+++ b/shards/mishards/grpc_utils/__init__.py
@@ -0,0 +1,37 @@
+from grpc_opentracing import SpanDecorator
+from milvus.grpc_gen import status_pb2
+
+
+class GrpcSpanDecorator(SpanDecorator):
+    def __call__(self, span, rpc_info):
+        status = None
+        if not rpc_info.response:
+            return
+        if isinstance(rpc_info.response, status_pb2.Status):
+            status = rpc_info.response
+        else:
+            try:
+                status = rpc_info.response.status
+            except Exception as e:
+                status = status_pb2.Status(error_code=status_pb2.UNEXPECTED_ERROR,
+                                           reason='Should not happen')
+
+        if status.error_code == 0:
+            return
+        error_log = {'event': 'error',
+                     'request': rpc_info.request,
+                     'response': rpc_info.response
+                     }
+        span.set_tag('error', True)
+        span.log_kv(error_log)
+
+
+def mark_grpc_method(func):
+    setattr(func, 'grpc_method', True)
+    return func
+
+
+def is_grpc_method(func):
+    if not func:
+        return False
+    return getattr(func, 'grpc_method', False)
diff --git a/shards/mishards/grpc_utils/grpc_args_parser.py b/shards/mishards/grpc_utils/grpc_args_parser.py
new file mode 100644
index 0000000000..039299803d
--- /dev/null
+++ b/shards/mishards/grpc_utils/grpc_args_parser.py
@@ -0,0 +1,102 @@
+from milvus import Status
+from functools import wraps
+
+
+def error_status(func):
+    @wraps(func)
+    def inner(*args, **kwargs):
+        try:
+            results = func(*args, **kwargs)
+        except Exception as e:
+            return Status(code=Status.UNEXPECTED_ERROR, message=str(e)), None
+
+        return Status(code=0, message="Success"), results
+
+    return inner
+
+
+class GrpcArgsParser(object):
+
+    @classmethod
+    @error_status
+    def parse_proto_TableSchema(cls, param):
+        _table_schema = {
+            'status': param.status,
+            'table_name': param.table_name,
+            'dimension': param.dimension,
+            'index_file_size': param.index_file_size,
+            'metric_type': param.metric_type
+        }
+
+        return _table_schema
+
+    @classmethod
+    @error_status
+    def parse_proto_TableName(cls, param):
+        return param.table_name
+
+    @classmethod
+    @error_status
+    def parse_proto_Index(cls, param):
+        _index = {
+            'index_type': param.index_type,
+            'nlist': param.nlist
+        }
+
+        return _index
+
+    @classmethod
+    @error_status
+    def parse_proto_IndexParam(cls, param):
+        _table_name = param.table_name
+        _status, _index = cls.parse_proto_Index(param.index)
+
+        if not _status.OK():
+            raise Exception("Argument parse error")
+
+        return _table_name, _index
+
+    @classmethod
+    @error_status
+    def parse_proto_Command(cls, param):
+        _cmd = param.cmd
+
+        return _cmd
+
+    @classmethod
+    @error_status
+    def parse_proto_Range(cls, param):
+        _start_value = param.start_value
+        _end_value = param.end_value
+
+        return _start_value, _end_value
+
+    @classmethod
+    @error_status
+    def parse_proto_RowRecord(cls, param):
+        return list(param.vector_data)
+
+    @classmethod
+    @error_status
+    def parse_proto_SearchParam(cls, param):
+        _table_name = param.table_name
+        _topk = param.topk
+        _nprobe = param.nprobe
+        _status, _range = cls.parse_proto_Range(param.query_range_array)
+
+        if not _status.OK():
+            raise Exception("Argument parse error")
+
+        _row_record = param.query_record_array
+
+        return _table_name, _row_record, _range, _topk
+
+    @classmethod
+    @error_status
+    def parse_proto_DeleteByRangeParam(cls, param):
+        _table_name = param.table_name
+        _range = param.range
+        _start_value = _range.start_value
+        _end_value = _range.end_value
+
+        return _table_name, _start_value, _end_value
diff --git a/shards/mishards/grpc_utils/grpc_args_wrapper.py b/shards/mishards/grpc_utils/grpc_args_wrapper.py
new file mode 100644
index 0000000000..7447dbd995
--- /dev/null
+++ b/shards/mishards/grpc_utils/grpc_args_wrapper.py
@@ -0,0 +1,4 @@
+# class GrpcArgsWrapper(object):
+
+# @classmethod
+# def proto_TableName(cls):
diff --git a/shards/mishards/grpc_utils/test_grpc.py b/shards/mishards/grpc_utils/test_grpc.py
new file mode 100644
index 0000000000..9af09e5d0d
--- /dev/null
+++ b/shards/mishards/grpc_utils/test_grpc.py
@@ -0,0 +1,75 @@
+import logging
+import opentracing
+from mishards.grpc_utils import GrpcSpanDecorator, is_grpc_method
+from milvus.grpc_gen import status_pb2, milvus_pb2
+
+logger = logging.getLogger(__name__)
+
+
+class FakeTracer(opentracing.Tracer):
+    pass
+
+
+class FakeSpan(opentracing.Span):
+    def __init__(self, context, tracer, **kwargs):
+        super(FakeSpan, self).__init__(tracer, context)
+        self.reset()
+
+    def set_tag(self, key, value):
+        self.tags.append({key: value})
+
+    def log_kv(self, key_values, timestamp=None):
+        self.logs.append(key_values)
+
+    def reset(self):
+        self.tags = []
+        self.logs = []
+
+
+class FakeRpcInfo:
+    def __init__(self, request, response):
+        self.request = request
+        self.response = response
+
+
+class TestGrpcUtils:
+    def test_span_deco(self):
+        request = 'request'
+        OK = status_pb2.Status(error_code=status_pb2.SUCCESS, reason='Success')
+        response = OK
+        rpc_info = FakeRpcInfo(request=request, response=response)
+        span = FakeSpan(context=None, tracer=FakeTracer())
+        span_deco = GrpcSpanDecorator()
+        span_deco(span, rpc_info)
+        assert len(span.logs) == 0
+        assert len(span.tags) == 0
+
+        response = milvus_pb2.BoolReply(status=OK, bool_reply=False)
+        rpc_info = FakeRpcInfo(request=request, response=response)
+        span = FakeSpan(context=None, tracer=FakeTracer())
+        span_deco = GrpcSpanDecorator()
+        span_deco(span, rpc_info)
+        assert len(span.logs) == 0
+        assert len(span.tags) == 0
+
+        response = 1
+        rpc_info = FakeRpcInfo(request=request, response=response)
+        span = FakeSpan(context=None, tracer=FakeTracer())
+        span_deco = GrpcSpanDecorator()
+        span_deco(span, rpc_info)
+        assert len(span.logs) == 1
+        assert len(span.tags) == 1
+
+        response = 0
+        rpc_info = FakeRpcInfo(request=request, response=response)
+        span = FakeSpan(context=None, tracer=FakeTracer())
+        span_deco = GrpcSpanDecorator()
+        span_deco(span, rpc_info)
+        assert len(span.logs) == 0
+        assert len(span.tags) == 0
+
+    def test_is_grpc_method(self):
+        target = 1
+        assert not is_grpc_method(target)
+        target = None
+        assert not is_grpc_method(target)
diff --git a/shards/mishards/hash_ring.py b/shards/mishards/hash_ring.py
new file mode 100644
index 0000000000..a97f3f580e
--- /dev/null
+++ b/shards/mishards/hash_ring.py
@@ -0,0 +1,150 @@
+import math
+import sys
+from bisect import bisect
+
+if sys.version_info >= (2, 5):
+    import hashlib
+    md5_constructor = hashlib.md5
+else:
+    import md5
+    md5_constructor = md5.new
+
+
+class HashRing(object):
+    def __init__(self, nodes=None, weights=None):
+        """`nodes` is a list of objects that have a proper __str__ representation.
+        `weights` is dictionary that sets weights to the nodes.  The default
+        weight is that all nodes are equal.
+        """
+        self.ring = dict()
+        self._sorted_keys = []
+
+        self.nodes = nodes
+
+        if not weights:
+            weights = {}
+        self.weights = weights
+
+        self._generate_circle()
+
+    def _generate_circle(self):
+        """Generates the circle.
+        """
+        total_weight = 0
+        for node in self.nodes:
+            total_weight += self.weights.get(node, 1)
+
+        for node in self.nodes:
+            weight = 1
+
+            if node in self.weights:
+                weight = self.weights.get(node)
+
+            factor = math.floor((40 * len(self.nodes) * weight) / total_weight)
+
+            for j in range(0, int(factor)):
+                b_key = self._hash_digest('%s-%s' % (node, j))
+
+                for i in range(0, 3):
+                    key = self._hash_val(b_key, lambda x: x + i * 4)
+                    self.ring[key] = node
+                    self._sorted_keys.append(key)
+
+        self._sorted_keys.sort()
+
+    def get_node(self, string_key):
+        """Given a string key a corresponding node in the hash ring is returned.
+
+        If the hash ring is empty, `None` is returned.
+        """
+        pos = self.get_node_pos(string_key)
+        if pos is None:
+            return None
+        return self.ring[self._sorted_keys[pos]]
+
+    def get_node_pos(self, string_key):
+        """Given a string key a corresponding node in the hash ring is returned
+        along with it's position in the ring.
+
+        If the hash ring is empty, (`None`, `None`) is returned.
+        """
+        if not self.ring:
+            return None
+
+        key = self.gen_key(string_key)
+
+        nodes = self._sorted_keys
+        pos = bisect(nodes, key)
+
+        if pos == len(nodes):
+            return 0
+        else:
+            return pos
+
+    def iterate_nodes(self, string_key, distinct=True):
+        """Given a string key it returns the nodes as a generator that can hold the key.
+
+        The generator iterates one time through the ring
+        starting at the correct position.
+
+        if `distinct` is set, then the nodes returned will be unique,
+        i.e. no virtual copies will be returned.
+        """
+        if not self.ring:
+            yield None, None
+
+        returned_values = set()
+
+        def distinct_filter(value):
+            if str(value) not in returned_values:
+                returned_values.add(str(value))
+                return value
+
+        pos = self.get_node_pos(string_key)
+        for key in self._sorted_keys[pos:]:
+            val = distinct_filter(self.ring[key])
+            if val:
+                yield val
+
+        for i, key in enumerate(self._sorted_keys):
+            if i < pos:
+                val = distinct_filter(self.ring[key])
+                if val:
+                    yield val
+
+    def gen_key(self, key):
+        """Given a string key it returns a long value,
+        this long value represents a place on the hash ring.
+
+        md5 is currently used because it mixes well.
+        """
+        b_key = self._hash_digest(key)
+        return self._hash_val(b_key, lambda x: x)
+
+    def _hash_val(self, b_key, entry_fn):
+        return (b_key[entry_fn(3)] << 24) | (b_key[entry_fn(2)] << 16) | (
+            b_key[entry_fn(1)] << 8) | b_key[entry_fn(0)]
+
+    def _hash_digest(self, key):
+        m = md5_constructor()
+        key = key.encode()
+        m.update(key)
+        return m.digest()
+
+
+if __name__ == '__main__':
+    from collections import defaultdict
+    servers = [
+        '192.168.0.246:11212', '192.168.0.247:11212', '192.168.0.248:11212',
+        '192.168.0.249:11212'
+    ]
+
+    ring = HashRing(servers)
+    keys = ['{}'.format(i) for i in range(100)]
+    mapped = defaultdict(list)
+    for k in keys:
+        server = ring.get_node(k)
+        mapped[server].append(k)
+
+    for k, v in mapped.items():
+        print(k, v)
diff --git a/shards/mishards/main.py b/shards/mishards/main.py
new file mode 100644
index 0000000000..c0d142607b
--- /dev/null
+++ b/shards/mishards/main.py
@@ -0,0 +1,15 @@
+import os
+import sys
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from mishards import (settings, create_app)
+
+
+def main():
+    server = create_app(settings.DefaultConfig)
+    server.run(port=settings.SERVER_PORT)
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main())
diff --git a/shards/mishards/models.py b/shards/mishards/models.py
new file mode 100644
index 0000000000..4b6c8f9ef4
--- /dev/null
+++ b/shards/mishards/models.py
@@ -0,0 +1,76 @@
+import logging
+from sqlalchemy import (Integer, Boolean, Text,
+                        String, BigInteger, and_, or_,
+                        Column)
+from sqlalchemy.orm import relationship, backref
+
+from mishards import db
+
+logger = logging.getLogger(__name__)
+
+
+class TableFiles(db.Model):
+    FILE_TYPE_NEW = 0
+    FILE_TYPE_RAW = 1
+    FILE_TYPE_TO_INDEX = 2
+    FILE_TYPE_INDEX = 3
+    FILE_TYPE_TO_DELETE = 4
+    FILE_TYPE_NEW_MERGE = 5
+    FILE_TYPE_NEW_INDEX = 6
+    FILE_TYPE_BACKUP = 7
+
+    __tablename__ = 'TableFiles'
+
+    id = Column(BigInteger, primary_key=True, autoincrement=True)
+    table_id = Column(String(50))
+    engine_type = Column(Integer)
+    file_id = Column(String(50))
+    file_type = Column(Integer)
+    file_size = Column(Integer, default=0)
+    row_count = Column(Integer, default=0)
+    updated_time = Column(BigInteger)
+    created_on = Column(BigInteger)
+    date = Column(Integer)
+
+    table = relationship(
+        'Tables',
+        primaryjoin='and_(foreign(TableFiles.table_id) == Tables.table_id)',
+        backref=backref('files', uselist=True, lazy='dynamic')
+    )
+
+
+class Tables(db.Model):
+    TO_DELETE = 1
+    NORMAL = 0
+
+    __tablename__ = 'Tables'
+
+    id = Column(BigInteger, primary_key=True, autoincrement=True)
+    table_id = Column(String(50), unique=True)
+    state = Column(Integer)
+    dimension = Column(Integer)
+    created_on = Column(Integer)
+    flag = Column(Integer, default=0)
+    index_file_size = Column(Integer)
+    engine_type = Column(Integer)
+    nlist = Column(Integer)
+    metric_type = Column(Integer)
+
+    def files_to_search(self, date_range=None):
+        cond = or_(
+            TableFiles.file_type == TableFiles.FILE_TYPE_RAW,
+            TableFiles.file_type == TableFiles.FILE_TYPE_TO_INDEX,
+            TableFiles.file_type == TableFiles.FILE_TYPE_INDEX,
+        )
+        if date_range:
+            cond = and_(
+                cond,
+                or_(
+                    and_(TableFiles.date >= d[0], TableFiles.date < d[1]) for d in date_range
+                )
+            )
+
+        files = self.files.filter(cond)
+
+        logger.debug('DATE_RANGE: {}'.format(date_range))
+        return files
diff --git a/shards/mishards/routings.py b/shards/mishards/routings.py
new file mode 100644
index 0000000000..823972726f
--- /dev/null
+++ b/shards/mishards/routings.py
@@ -0,0 +1,96 @@
+import logging
+from sqlalchemy import exc as sqlalchemy_exc
+from sqlalchemy import and_
+
+from mishards import exceptions, db
+from mishards.hash_ring import HashRing
+from mishards.models import Tables
+
+logger = logging.getLogger(__name__)
+
+
+class RouteManager:
+    ROUTER_CLASSES = {}
+
+    @classmethod
+    def register_router_class(cls, target):
+        name = target.__dict__.get('NAME', None)
+        name = name if name else target.__class__.__name__
+        cls.ROUTER_CLASSES[name] = target
+        return target
+
+    @classmethod
+    def get_router_class(cls, name):
+        return cls.ROUTER_CLASSES.get(name, None)
+
+
+class RouterFactory:
+    @classmethod
+    def new_router(cls, name, conn_mgr, **kwargs):
+        router_class = RouteManager.get_router_class(name)
+        assert router_class
+        return router_class(conn_mgr, **kwargs)
+
+
+class RouterMixin:
+    def __init__(self, conn_mgr):
+        self.conn_mgr = conn_mgr
+
+    def routing(self, table_name, metadata=None, **kwargs):
+        raise NotImplemented()
+
+    def connection(self, metadata=None):
+        conn = self.conn_mgr.conn('WOSERVER', metadata=metadata)
+        if conn:
+            conn.on_connect(metadata=metadata)
+        return conn.conn
+
+    def query_conn(self, name, metadata=None):
+        conn = self.conn_mgr.conn(name, metadata=metadata)
+        if not conn:
+            raise exceptions.ConnectionNotFoundError(name, metadata=metadata)
+        conn.on_connect(metadata=metadata)
+        return conn.conn
+
+
+@RouteManager.register_router_class
+class FileBasedHashRingRouter(RouterMixin):
+    NAME = 'FileBasedHashRingRouter'
+
+    def __init__(self, conn_mgr, **kwargs):
+        super(FileBasedHashRingRouter, self).__init__(conn_mgr)
+
+    def routing(self, table_name, metadata=None, **kwargs):
+        range_array = kwargs.pop('range_array', None)
+        return self._route(table_name, range_array, metadata, **kwargs)
+
+    def _route(self, table_name, range_array, metadata=None, **kwargs):
+        # PXU TODO: Implement Thread-local Context
+        # PXU TODO: Session life mgt
+        try:
+            table = db.Session.query(Tables).filter(
+                and_(Tables.table_id == table_name,
+                     Tables.state != Tables.TO_DELETE)).first()
+        except sqlalchemy_exc.SQLAlchemyError as e:
+            raise exceptions.DBError(message=str(e), metadata=metadata)
+
+        if not table:
+            raise exceptions.TableNotFoundError(table_name, metadata=metadata)
+        files = table.files_to_search(range_array)
+        db.remove_session()
+
+        servers = self.conn_mgr.conn_names
+        logger.info('Available servers: {}'.format(servers))
+
+        ring = HashRing(servers)
+
+        routing = {}
+
+        for f in files:
+            target_host = ring.get_node(str(f.id))
+            sub = routing.get(target_host, None)
+            if not sub:
+                routing[target_host] = {'table_id': table_name, 'file_ids': []}
+            routing[target_host]['file_ids'].append(str(f.id))
+
+        return routing
diff --git a/shards/mishards/server.py b/shards/mishards/server.py
new file mode 100644
index 0000000000..599a00e455
--- /dev/null
+++ b/shards/mishards/server.py
@@ -0,0 +1,122 @@
+import logging
+import grpc
+import time
+import socket
+import inspect
+from urllib.parse import urlparse
+from functools import wraps
+from concurrent import futures
+from grpc._cython import cygrpc
+from milvus.grpc_gen.milvus_pb2_grpc import add_MilvusServiceServicer_to_server
+from mishards.grpc_utils import is_grpc_method
+from mishards.service_handler import ServiceHandler
+from mishards import settings
+
+logger = logging.getLogger(__name__)
+
+
+class Server:
+    def __init__(self):
+        self.pre_run_handlers = set()
+        self.grpc_methods = set()
+        self.error_handlers = {}
+        self.exit_flag = False
+
+    def init_app(self,
+                 conn_mgr,
+                 tracer,
+                 router,
+                 discover,
+                 port=19530,
+                 max_workers=10,
+                 **kwargs):
+        self.port = int(port)
+        self.conn_mgr = conn_mgr
+        self.tracer = tracer
+        self.router = router
+        self.discover = discover
+
+        self.server_impl = grpc.server(
+            thread_pool=futures.ThreadPoolExecutor(max_workers=max_workers),
+            options=[(cygrpc.ChannelArgKey.max_send_message_length, -1),
+                     (cygrpc.ChannelArgKey.max_receive_message_length, -1)])
+
+        self.server_impl = self.tracer.decorate(self.server_impl)
+
+        self.register_pre_run_handler(self.pre_run_handler)
+
+    def pre_run_handler(self):
+        woserver = settings.WOSERVER
+        url = urlparse(woserver)
+        ip = socket.gethostbyname(url.hostname)
+        socket.inet_pton(socket.AF_INET, ip)
+        self.conn_mgr.register(
+            'WOSERVER', '{}://{}:{}'.format(url.scheme, ip, url.port or 80))
+
+    def register_pre_run_handler(self, func):
+        logger.info('Regiterring {} into server pre_run_handlers'.format(func))
+        self.pre_run_handlers.add(func)
+        return func
+
+    def wrap_method_with_errorhandler(self, func):
+        @wraps(func)
+        def wrapper(*args, **kwargs):
+            try:
+                return func(*args, **kwargs)
+            except Exception as e:
+                if e.__class__ in self.error_handlers:
+                    return self.error_handlers[e.__class__](e)
+                raise
+
+        return wrapper
+
+    def errorhandler(self, exception):
+        if inspect.isclass(exception) and issubclass(exception, Exception):
+
+            def wrapper(func):
+                self.error_handlers[exception] = func
+                return func
+
+            return wrapper
+        return exception
+
+    def on_pre_run(self):
+        for handler in self.pre_run_handlers:
+            handler()
+        self.discover.start()
+
+    def start(self, port=None):
+        handler_class = self.decorate_handler(ServiceHandler)
+        add_MilvusServiceServicer_to_server(
+            handler_class(tracer=self.tracer,
+                          router=self.router), self.server_impl)
+        self.server_impl.add_insecure_port("[::]:{}".format(
+            str(port or self.port)))
+        self.server_impl.start()
+
+    def run(self, port):
+        logger.info('Milvus server start ......')
+        port = port or self.port
+        self.on_pre_run()
+
+        self.start(port)
+        logger.info('Listening on port {}'.format(port))
+
+        try:
+            while not self.exit_flag:
+                time.sleep(5)
+        except KeyboardInterrupt:
+            self.stop()
+
+    def stop(self):
+        logger.info('Server is shuting down ......')
+        self.exit_flag = True
+        self.server_impl.stop(0)
+        self.tracer.close()
+        logger.info('Server is closed')
+
+    def decorate_handler(self, handler):
+        for key, attr in handler.__dict__.items():
+            if is_grpc_method(attr):
+                setattr(handler, key, self.wrap_method_with_errorhandler(attr))
+        return handler
diff --git a/shards/mishards/service_handler.py b/shards/mishards/service_handler.py
new file mode 100644
index 0000000000..5e91c14f14
--- /dev/null
+++ b/shards/mishards/service_handler.py
@@ -0,0 +1,475 @@
+import logging
+import time
+import datetime
+from collections import defaultdict
+
+import multiprocessing
+from concurrent.futures import ThreadPoolExecutor
+from milvus.grpc_gen import milvus_pb2, milvus_pb2_grpc, status_pb2
+from milvus.grpc_gen.milvus_pb2 import TopKQueryResult
+from milvus.client.abstract import Range
+from milvus.client import types as Types
+
+from mishards import (db, settings, exceptions)
+from mishards.grpc_utils import mark_grpc_method
+from mishards.grpc_utils.grpc_args_parser import GrpcArgsParser as Parser
+from mishards import utilities
+
+logger = logging.getLogger(__name__)
+
+
+class ServiceHandler(milvus_pb2_grpc.MilvusServiceServicer):
+    MAX_NPROBE = 2048
+    MAX_TOPK = 2048
+
+    def __init__(self, tracer, router, max_workers=multiprocessing.cpu_count(), **kwargs):
+        self.table_meta = {}
+        self.error_handlers = {}
+        self.tracer = tracer
+        self.router = router
+        self.max_workers = max_workers
+
+    def _do_merge(self, files_n_topk_results, topk, reverse=False, **kwargs):
+        status = status_pb2.Status(error_code=status_pb2.SUCCESS,
+                                   reason="Success")
+        if not files_n_topk_results:
+            return status, []
+
+        request_results = defaultdict(list)
+
+        calc_time = time.time()
+        for files_collection in files_n_topk_results:
+            if isinstance(files_collection, tuple):
+                status, _ = files_collection
+                return status, []
+            for request_pos, each_request_results in enumerate(
+                    files_collection.topk_query_result):
+                request_results[request_pos].extend(
+                    each_request_results.query_result_arrays)
+                request_results[request_pos] = sorted(
+                    request_results[request_pos],
+                    key=lambda x: x.distance,
+                    reverse=reverse)[:topk]
+
+        calc_time = time.time() - calc_time
+        logger.info('Merge takes {}'.format(calc_time))
+
+        results = sorted(request_results.items())
+        topk_query_result = []
+
+        for result in results:
+            query_result = TopKQueryResult(query_result_arrays=result[1])
+            topk_query_result.append(query_result)
+
+        return status, topk_query_result
+
+    def _do_query(self,
+                  context,
+                  table_id,
+                  table_meta,
+                  vectors,
+                  topk,
+                  nprobe,
+                  range_array=None,
+                  **kwargs):
+        metadata = kwargs.get('metadata', None)
+        range_array = [
+            utilities.range_to_date(r, metadata=metadata) for r in range_array
+        ] if range_array else None
+
+        routing = {}
+        p_span = None if self.tracer.empty else context.get_active_span(
+        ).context
+        with self.tracer.start_span('get_routing', child_of=p_span):
+            routing = self.router.routing(table_id,
+                                          range_array=range_array,
+                                          metadata=metadata)
+        logger.info('Routing: {}'.format(routing))
+
+        metadata = kwargs.get('metadata', None)
+
+        rs = []
+        all_topk_results = []
+
+        def search(addr, query_params, vectors, topk, nprobe, **kwargs):
+            logger.info(
+                'Send Search Request: addr={};params={};nq={};topk={};nprobe={}'
+                .format(addr, query_params, len(vectors), topk, nprobe))
+
+            conn = self.router.query_conn(addr, metadata=metadata)
+            start = time.time()
+            span = kwargs.get('span', None)
+            span = span if span else (None if self.tracer.empty else
+                                      context.get_active_span().context)
+
+            with self.tracer.start_span('search_{}'.format(addr),
+                                        child_of=span):
+                ret = conn.search_vectors_in_files(
+                    table_name=query_params['table_id'],
+                    file_ids=query_params['file_ids'],
+                    query_records=vectors,
+                    top_k=topk,
+                    nprobe=nprobe,
+                    lazy_=True)
+                end = time.time()
+                logger.info('search_vectors_in_files takes: {}'.format(end - start))
+
+                all_topk_results.append(ret)
+
+        with self.tracer.start_span('do_search', child_of=p_span) as span:
+            with ThreadPoolExecutor(max_workers=self.max_workers) as pool:
+                for addr, params in routing.items():
+                    res = pool.submit(search,
+                                      addr,
+                                      params,
+                                      vectors,
+                                      topk,
+                                      nprobe,
+                                      span=span)
+                    rs.append(res)
+
+                for res in rs:
+                    res.result()
+
+        reverse = table_meta.metric_type == Types.MetricType.IP
+        with self.tracer.start_span('do_merge', child_of=p_span):
+            return self._do_merge(all_topk_results,
+                                  topk,
+                                  reverse=reverse,
+                                  metadata=metadata)
+
+    def _create_table(self, table_schema):
+        return self.router.connection().create_table(table_schema)
+
+    @mark_grpc_method
+    def CreateTable(self, request, context):
+        _status, _table_schema = Parser.parse_proto_TableSchema(request)
+
+        if not _status.OK():
+            return status_pb2.Status(error_code=_status.code,
+                                     reason=_status.message)
+
+        logger.info('CreateTable {}'.format(_table_schema['table_name']))
+
+        _status = self._create_table(_table_schema)
+
+        return status_pb2.Status(error_code=_status.code,
+                                 reason=_status.message)
+
+    def _has_table(self, table_name, metadata=None):
+        return self.router.connection(metadata=metadata).has_table(table_name)
+
+    @mark_grpc_method
+    def HasTable(self, request, context):
+        _status, _table_name = Parser.parse_proto_TableName(request)
+
+        if not _status.OK():
+            return milvus_pb2.BoolReply(status=status_pb2.Status(
+                error_code=_status.code, reason=_status.message),
+                bool_reply=False)
+
+        logger.info('HasTable {}'.format(_table_name))
+
+        _status, _bool = self._has_table(_table_name,
+                                metadata={'resp_class': milvus_pb2.BoolReply})
+
+        return milvus_pb2.BoolReply(status=status_pb2.Status(
+            error_code=_status.code, reason=_status.message),
+            bool_reply=_bool)
+
+    def _delete_table(self, table_name):
+        return self.router.connection().delete_table(table_name)
+
+    @mark_grpc_method
+    def DropTable(self, request, context):
+        _status, _table_name = Parser.parse_proto_TableName(request)
+
+        if not _status.OK():
+            return status_pb2.Status(error_code=_status.code,
+                                     reason=_status.message)
+
+        logger.info('DropTable {}'.format(_table_name))
+
+        _status = self._delete_table(_table_name)
+
+        return status_pb2.Status(error_code=_status.code,
+                                 reason=_status.message)
+
+    def _create_index(self, table_name, index):
+        return self.router.connection().create_index(table_name, index)
+
+    @mark_grpc_method
+    def CreateIndex(self, request, context):
+        _status, unpacks = Parser.parse_proto_IndexParam(request)
+
+        if not _status.OK():
+            return status_pb2.Status(error_code=_status.code,
+                                     reason=_status.message)
+
+        _table_name, _index = unpacks
+
+        logger.info('CreateIndex {}'.format(_table_name))
+
+        # TODO: interface create_table incompleted
+        _status = self._create_index(_table_name, _index)
+
+        return status_pb2.Status(error_code=_status.code,
+                                 reason=_status.message)
+
+    def _add_vectors(self, param, metadata=None):
+        return self.router.connection(metadata=metadata).add_vectors(
+            None, None, insert_param=param)
+
+    @mark_grpc_method
+    def Insert(self, request, context):
+        logger.info('Insert')
+        # TODO: Ths SDK interface add_vectors() could update, add a key 'row_id_array'
+        _status, _ids = self._add_vectors(
+            metadata={'resp_class': milvus_pb2.VectorIds}, param=request)
+        return milvus_pb2.VectorIds(status=status_pb2.Status(
+            error_code=_status.code, reason=_status.message),
+            vector_id_array=_ids)
+
+    @mark_grpc_method
+    def Search(self, request, context):
+
+        table_name = request.table_name
+
+        topk = request.topk
+        nprobe = request.nprobe
+
+        logger.info('Search {}: topk={} nprobe={}'.format(
+            table_name, topk, nprobe))
+
+        metadata = {'resp_class': milvus_pb2.TopKQueryResultList}
+
+        if nprobe > self.MAX_NPROBE or nprobe <= 0:
+            raise exceptions.InvalidArgumentError(
+                message='Invalid nprobe: {}'.format(nprobe), metadata=metadata)
+
+        if topk > self.MAX_TOPK or topk <= 0:
+            raise exceptions.InvalidTopKError(
+                message='Invalid topk: {}'.format(topk), metadata=metadata)
+
+        table_meta = self.table_meta.get(table_name, None)
+
+        if not table_meta:
+            status, info = self.router.connection(
+                metadata=metadata).describe_table(table_name)
+            if not status.OK():
+                raise exceptions.TableNotFoundError(table_name,
+                                                    metadata=metadata)
+
+            self.table_meta[table_name] = info
+            table_meta = info
+
+        start = time.time()
+
+        query_record_array = []
+
+        for query_record in request.query_record_array:
+            query_record_array.append(list(query_record.vector_data))
+
+        query_range_array = []
+        for query_range in request.query_range_array:
+            query_range_array.append(
+                Range(query_range.start_value, query_range.end_value))
+
+        status, results = self._do_query(context,
+                                         table_name,
+                                         table_meta,
+                                         query_record_array,
+                                         topk,
+                                         nprobe,
+                                         query_range_array,
+                                         metadata=metadata)
+
+        now = time.time()
+        logger.info('SearchVector takes: {}'.format(now - start))
+
+        topk_result_list = milvus_pb2.TopKQueryResultList(
+            status=status_pb2.Status(error_code=status.error_code,
+                                     reason=status.reason),
+            topk_query_result=results)
+        return topk_result_list
+
+    @mark_grpc_method
+    def SearchInFiles(self, request, context):
+        raise NotImplemented()
+
+    def _describe_table(self, table_name, metadata=None):
+        return self.router.connection(metadata=metadata).describe_table(table_name)
+
+    @mark_grpc_method
+    def DescribeTable(self, request, context):
+        _status, _table_name = Parser.parse_proto_TableName(request)
+
+        if not _status.OK():
+            return milvus_pb2.TableSchema(status=status_pb2.Status(
+                error_code=_status.code, reason=_status.message), )
+
+        metadata = {'resp_class': milvus_pb2.TableSchema}
+
+        logger.info('DescribeTable {}'.format(_table_name))
+        _status, _table = self._describe_table(metadata=metadata,
+                                               table_name=_table_name)
+
+        if _status.OK():
+            return milvus_pb2.TableSchema(
+                table_name=_table_name,
+                index_file_size=_table.index_file_size,
+                dimension=_table.dimension,
+                metric_type=_table.metric_type,
+                status=status_pb2.Status(error_code=_status.code,
+                                         reason=_status.message),
+            )
+
+        return milvus_pb2.TableSchema(
+            table_name=_table_name,
+            status=status_pb2.Status(error_code=_status.code,
+                                     reason=_status.message),
+        )
+
+    def _count_table(self, table_name, metadata=None):
+        return self.router.connection(
+            metadata=metadata).get_table_row_count(table_name)
+
+    @mark_grpc_method
+    def CountTable(self, request, context):
+        _status, _table_name = Parser.parse_proto_TableName(request)
+
+        if not _status.OK():
+            status = status_pb2.Status(error_code=_status.code,
+                                       reason=_status.message)
+
+            return milvus_pb2.TableRowCount(status=status)
+
+        logger.info('CountTable {}'.format(_table_name))
+
+        metadata = {'resp_class': milvus_pb2.TableRowCount}
+        _status, _count = self._count_table(_table_name, metadata=metadata)
+
+        return milvus_pb2.TableRowCount(
+            status=status_pb2.Status(error_code=_status.code,
+                                     reason=_status.message),
+            table_row_count=_count if isinstance(_count, int) else -1)
+
+    def _get_server_version(self, metadata=None):
+        return self.router.connection(metadata=metadata).server_version()
+
+    @mark_grpc_method
+    def Cmd(self, request, context):
+        _status, _cmd = Parser.parse_proto_Command(request)
+        logger.info('Cmd: {}'.format(_cmd))
+
+        if not _status.OK():
+            return milvus_pb2.StringReply(status=status_pb2.Status(
+                error_code=_status.code, reason=_status.message))
+
+        metadata = {'resp_class': milvus_pb2.StringReply}
+
+        if _cmd == 'version':
+            _status, _reply = self._get_server_version(metadata=metadata)
+        else:
+            _status, _reply = self.router.connection(
+                metadata=metadata).server_status()
+
+        return milvus_pb2.StringReply(status=status_pb2.Status(
+            error_code=_status.code, reason=_status.message),
+            string_reply=_reply)
+
+    def _show_tables(self, metadata=None):
+        return self.router.connection(metadata=metadata).show_tables()
+
+    @mark_grpc_method
+    def ShowTables(self, request, context):
+        logger.info('ShowTables')
+        metadata = {'resp_class': milvus_pb2.TableName}
+        _status, _results = self._show_tables(metadata=metadata)
+
+        return milvus_pb2.TableNameList(status=status_pb2.Status(
+            error_code=_status.code, reason=_status.message),
+            table_names=_results)
+
+    def _delete_by_range(self, table_name, start_date, end_date):
+        return self.router.connection().delete_vectors_by_range(table_name,
+                                                                start_date,
+                                                                end_date)
+
+    @mark_grpc_method
+    def DeleteByRange(self, request, context):
+        _status, unpacks = \
+            Parser.parse_proto_DeleteByRangeParam(request)
+
+        if not _status.OK():
+            return status_pb2.Status(error_code=_status.code,
+                                     reason=_status.message)
+
+        _table_name, _start_date, _end_date = unpacks
+
+        logger.info('DeleteByRange {}: {} {}'.format(_table_name, _start_date,
+                                                     _end_date))
+        _status = self._delete_by_range(_table_name, _start_date, _end_date)
+        return status_pb2.Status(error_code=_status.code,
+                                 reason=_status.message)
+
+    def _preload_table(self, table_name):
+        return self.router.connection().preload_table(table_name)
+
+    @mark_grpc_method
+    def PreloadTable(self, request, context):
+        _status, _table_name = Parser.parse_proto_TableName(request)
+
+        if not _status.OK():
+            return status_pb2.Status(error_code=_status.code,
+                                     reason=_status.message)
+
+        logger.info('PreloadTable {}'.format(_table_name))
+        _status = self._preload_table(_table_name)
+        return status_pb2.Status(error_code=_status.code,
+                                 reason=_status.message)
+
+    def _describe_index(self, table_name, metadata=None):
+        return self.router.connection(metadata=metadata).describe_index(table_name)
+
+    @mark_grpc_method
+    def DescribeIndex(self, request, context):
+        _status, _table_name = Parser.parse_proto_TableName(request)
+
+        if not _status.OK():
+            return milvus_pb2.IndexParam(status=status_pb2.Status(
+                error_code=_status.code, reason=_status.message))
+
+        metadata = {'resp_class': milvus_pb2.IndexParam}
+
+        logger.info('DescribeIndex {}'.format(_table_name))
+        _status, _index_param = self._describe_index(table_name=_table_name,
+                                                     metadata=metadata)
+
+        if not _index_param:
+            return milvus_pb2.IndexParam(status=status_pb2.Status(
+                error_code=_status.code, reason=_status.message))
+
+        _index = milvus_pb2.Index(index_type=_index_param._index_type,
+                                  nlist=_index_param._nlist)
+
+        return milvus_pb2.IndexParam(status=status_pb2.Status(
+            error_code=_status.code, reason=_status.message),
+            table_name=_table_name,
+            index=_index)
+
+    def _drop_index(self, table_name):
+        return self.router.connection().drop_index(table_name)
+
+    @mark_grpc_method
+    def DropIndex(self, request, context):
+        _status, _table_name = Parser.parse_proto_TableName(request)
+
+        if not _status.OK():
+            return status_pb2.Status(error_code=_status.code,
+                                     reason=_status.message)
+
+        logger.info('DropIndex {}'.format(_table_name))
+        _status = self._drop_index(_table_name)
+        return status_pb2.Status(error_code=_status.code,
+                                 reason=_status.message)
diff --git a/shards/mishards/settings.py b/shards/mishards/settings.py
new file mode 100644
index 0000000000..21a3bb7a65
--- /dev/null
+++ b/shards/mishards/settings.py
@@ -0,0 +1,94 @@
+import sys
+import os
+
+from environs import Env
+env = Env()
+
+FROM_EXAMPLE = env.bool('FROM_EXAMPLE', False)
+if FROM_EXAMPLE:
+    from dotenv import load_dotenv
+    load_dotenv('./mishards/.env.example')
+else:
+    env.read_env()
+
+DEBUG = env.bool('DEBUG', False)
+
+LOG_LEVEL = env.str('LOG_LEVEL', 'DEBUG' if DEBUG else 'INFO')
+LOG_PATH = env.str('LOG_PATH', '/tmp/mishards')
+LOG_NAME = env.str('LOG_NAME', 'logfile')
+TIMEZONE = env.str('TIMEZONE', 'UTC')
+
+from utils.logger_helper import config
+config(LOG_LEVEL, LOG_PATH, LOG_NAME, TIMEZONE)
+
+TIMEOUT = env.int('TIMEOUT', 60)
+MAX_RETRY = env.int('MAX_RETRY', 3)
+
+SERVER_PORT = env.int('SERVER_PORT', 19530)
+SERVER_TEST_PORT = env.int('SERVER_TEST_PORT', 19530)
+WOSERVER = env.str('WOSERVER')
+
+SD_PROVIDER_SETTINGS = None
+SD_PROVIDER = env.str('SD_PROVIDER', 'Kubernetes')
+if SD_PROVIDER == 'Kubernetes':
+    from sd.kubernetes_provider import KubernetesProviderSettings
+    SD_PROVIDER_SETTINGS = KubernetesProviderSettings(
+        namespace=env.str('SD_NAMESPACE', ''),
+        in_cluster=env.bool('SD_IN_CLUSTER', False),
+        poll_interval=env.int('SD_POLL_INTERVAL', 5),
+        pod_patt=env.str('SD_ROSERVER_POD_PATT', ''),
+        label_selector=env.str('SD_LABEL_SELECTOR', ''),
+        port=env.int('SD_PORT', 19530))
+elif SD_PROVIDER == 'Static':
+    from sd.static_provider import StaticProviderSettings
+    SD_PROVIDER_SETTINGS = StaticProviderSettings(
+        hosts=env.list('SD_STATIC_HOSTS', []),
+        port=env.int('SD_STATIC_PORT', 19530))
+
+# TESTING_WOSERVER = env.str('TESTING_WOSERVER', 'tcp://127.0.0.1:19530')
+
+
+class TracingConfig:
+    TRACING_SERVICE_NAME = env.str('TRACING_SERVICE_NAME', 'mishards')
+    TRACING_VALIDATE = env.bool('TRACING_VALIDATE', True)
+    TRACING_LOG_PAYLOAD = env.bool('TRACING_LOG_PAYLOAD', False)
+    TRACING_CONFIG = {
+        'sampler': {
+            'type': env.str('TRACING_SAMPLER_TYPE', 'const'),
+            'param': env.str('TRACING_SAMPLER_PARAM', "1"),
+        },
+        'local_agent': {
+            'reporting_host': env.str('TRACING_REPORTING_HOST', '127.0.0.1'),
+            'reporting_port': env.str('TRACING_REPORTING_PORT', '5775')
+        },
+        'logging': env.bool('TRACING_LOGGING', True)
+    }
+    DEFAULT_TRACING_CONFIG = {
+        'sampler': {
+            'type': env.str('TRACING_SAMPLER_TYPE', 'const'),
+            'param': env.str('TRACING_SAMPLER_PARAM', "0"),
+        }
+    }
+
+
+class DefaultConfig:
+    SQLALCHEMY_DATABASE_URI = env.str('SQLALCHEMY_DATABASE_URI')
+    SQL_ECHO = env.bool('SQL_ECHO', False)
+    TRACING_TYPE = env.str('TRACING_TYPE', '')
+    ROUTER_CLASS_NAME = env.str('ROUTER_CLASS_NAME', 'FileBasedHashRingRouter')
+
+
+class TestingConfig(DefaultConfig):
+    SQLALCHEMY_DATABASE_URI = env.str('SQLALCHEMY_DATABASE_TEST_URI', '')
+    SQL_ECHO = env.bool('SQL_TEST_ECHO', False)
+    TRACING_TYPE = env.str('TRACING_TEST_TYPE', '')
+    ROUTER_CLASS_NAME = env.str('ROUTER_CLASS_TEST_NAME', 'FileBasedHashRingRouter')
+
+
+if __name__ == '__main__':
+    import logging
+    logger = logging.getLogger(__name__)
+    logger.debug('DEBUG')
+    logger.info('INFO')
+    logger.warn('WARN')
+    logger.error('ERROR')
diff --git a/shards/mishards/test_connections.py b/shards/mishards/test_connections.py
new file mode 100644
index 0000000000..819d2e03da
--- /dev/null
+++ b/shards/mishards/test_connections.py
@@ -0,0 +1,101 @@
+import logging
+import pytest
+import mock
+
+from milvus import Milvus
+from mishards.connections import (ConnectionMgr, Connection)
+from mishards import exceptions
+
+logger = logging.getLogger(__name__)
+
+
+@pytest.mark.usefixtures('app')
+class TestConnection:
+    def test_manager(self):
+        mgr = ConnectionMgr()
+
+        mgr.register('pod1', '111')
+        mgr.register('pod2', '222')
+        mgr.register('pod2', '222')
+        mgr.register('pod2', '2222')
+        assert len(mgr.conn_names) == 2
+
+        mgr.unregister('pod1')
+        assert len(mgr.conn_names) == 1
+
+        mgr.unregister('pod2')
+        assert len(mgr.conn_names) == 0
+
+        mgr.register('WOSERVER', 'xxxx')
+        assert len(mgr.conn_names) == 0
+
+        assert not mgr.conn('XXXX', None)
+        with pytest.raises(exceptions.ConnectionNotFoundError):
+            mgr.conn('XXXX', None, True)
+
+        mgr.conn('WOSERVER', None)
+
+    def test_connection(self):
+        class Conn:
+            def __init__(self, state):
+                self.state = state
+
+            def connect(self, uri):
+                return self.state
+
+            def connected(self):
+                return self.state
+
+        FAIL_CONN = Conn(False)
+        PASS_CONN = Conn(True)
+
+        class Retry:
+            def __init__(self):
+                self.times = 0
+
+            def __call__(self, conn):
+                self.times += 1
+                logger.info('Retrying {}'.format(self.times))
+
+        class Func():
+            def __init__(self):
+                self.executed = False
+
+            def __call__(self):
+                self.executed = True
+
+        max_retry = 3
+
+        RetryObj = Retry()
+
+        c = Connection('client',
+                       uri='xx',
+                       max_retry=max_retry,
+                       on_retry_func=RetryObj)
+        c.conn = FAIL_CONN
+        ff = Func()
+        this_connect = c.connect(func=ff)
+        with pytest.raises(exceptions.ConnectionConnectError):
+            this_connect()
+        assert RetryObj.times == max_retry
+        assert not ff.executed
+        RetryObj = Retry()
+
+        c.conn = PASS_CONN
+        this_connect = c.connect(func=ff)
+        this_connect()
+        assert ff.executed
+        assert RetryObj.times == 0
+
+        this_connect = c.connect(func=None)
+        with pytest.raises(TypeError):
+            this_connect()
+
+        errors = []
+
+        def error_handler(err):
+            errors.append(err)
+
+        this_connect = c.connect(func=None, exception_handler=error_handler)
+        this_connect()
+        assert len(errors) == 1
diff --git a/shards/mishards/test_models.py b/shards/mishards/test_models.py
new file mode 100644
index 0000000000..d60b62713e
--- /dev/null
+++ b/shards/mishards/test_models.py
@@ -0,0 +1,39 @@
+import logging
+import pytest
+from mishards.factories import TableFiles, Tables, TableFilesFactory, TablesFactory
+from mishards import db, create_app, settings
+from mishards.factories import (
+    Tables, TableFiles,
+    TablesFactory, TableFilesFactory
+)
+
+logger = logging.getLogger(__name__)
+
+
+@pytest.mark.usefixtures('app')
+class TestModels:
+    def test_files_to_search(self):
+        table = TablesFactory()
+        new_files_cnt = 5
+        to_index_cnt = 10
+        raw_cnt = 20
+        backup_cnt = 12
+        to_delete_cnt = 9
+        index_cnt = 8
+        new_index_cnt = 6
+        new_merge_cnt = 11
+
+        new_files = TableFilesFactory.create_batch(new_files_cnt, table=table, file_type=TableFiles.FILE_TYPE_NEW, date=110)
+        to_index_files = TableFilesFactory.create_batch(to_index_cnt, table=table, file_type=TableFiles.FILE_TYPE_TO_INDEX, date=110)
+        raw_files = TableFilesFactory.create_batch(raw_cnt, table=table, file_type=TableFiles.FILE_TYPE_RAW, date=120)
+        backup_files = TableFilesFactory.create_batch(backup_cnt, table=table, file_type=TableFiles.FILE_TYPE_BACKUP, date=110)
+        index_files = TableFilesFactory.create_batch(index_cnt, table=table, file_type=TableFiles.FILE_TYPE_INDEX, date=110)
+        new_index_files = TableFilesFactory.create_batch(new_index_cnt, table=table, file_type=TableFiles.FILE_TYPE_NEW_INDEX, date=110)
+        new_merge_files = TableFilesFactory.create_batch(new_merge_cnt, table=table, file_type=TableFiles.FILE_TYPE_NEW_MERGE, date=110)
+        to_delete_files = TableFilesFactory.create_batch(to_delete_cnt, table=table, file_type=TableFiles.FILE_TYPE_TO_DELETE, date=110)
+        assert table.files_to_search().count() == raw_cnt + index_cnt + to_index_cnt
+
+        assert table.files_to_search([(100, 115)]).count() == index_cnt + to_index_cnt
+        assert table.files_to_search([(111, 120)]).count() == 0
+        assert table.files_to_search([(111, 121)]).count() == raw_cnt
+        assert table.files_to_search([(110, 121)]).count() == raw_cnt + index_cnt + to_index_cnt
diff --git a/shards/mishards/test_server.py b/shards/mishards/test_server.py
new file mode 100644
index 0000000000..efd3912076
--- /dev/null
+++ b/shards/mishards/test_server.py
@@ -0,0 +1,279 @@
+import logging
+import pytest
+import mock
+import datetime
+import random
+import faker
+import inspect
+from milvus import Milvus
+from milvus.client.types import Status, IndexType, MetricType
+from milvus.client.abstract import IndexParam, TableSchema
+from milvus.grpc_gen import status_pb2, milvus_pb2
+from mishards import db, create_app, settings
+from mishards.service_handler import ServiceHandler
+from mishards.grpc_utils.grpc_args_parser import GrpcArgsParser as Parser
+from mishards.factories import TableFilesFactory, TablesFactory, TableFiles, Tables
+from mishards.routings import RouterMixin
+
+logger = logging.getLogger(__name__)
+
+OK = Status(code=Status.SUCCESS, message='Success')
+BAD = Status(code=Status.PERMISSION_DENIED, message='Fail')
+
+
+@pytest.mark.usefixtures('started_app')
+class TestServer:
+    @property
+    def client(self):
+        m = Milvus()
+        m.connect(host='localhost', port=settings.SERVER_TEST_PORT)
+        return m
+
+    def test_server_start(self, started_app):
+        assert started_app.conn_mgr.metas.get('WOSERVER') == settings.WOSERVER
+
+    def test_cmd(self, started_app):
+        ServiceHandler._get_server_version = mock.MagicMock(return_value=(OK,
+                                                                          ''))
+        status, _ = self.client.server_version()
+        assert status.OK()
+
+        Parser.parse_proto_Command = mock.MagicMock(return_value=(BAD, 'cmd'))
+        status, _ = self.client.server_version()
+        assert not status.OK()
+
+    def test_drop_index(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+        ServiceHandler._drop_index = mock.MagicMock(return_value=OK)
+        status = self.client.drop_index(table_name)
+        assert status.OK()
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(BAD, table_name))
+        status = self.client.drop_index(table_name)
+        assert not status.OK()
+
+    def test_describe_index(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+        index_type = IndexType.FLAT
+        nlist = 1
+        index_param = IndexParam(table_name=table_name,
+                                 index_type=index_type,
+                                 nlist=nlist)
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(OK, table_name))
+        ServiceHandler._describe_index = mock.MagicMock(
+            return_value=(OK, index_param))
+        status, ret = self.client.describe_index(table_name)
+        assert status.OK()
+        assert ret._table_name == index_param._table_name
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(BAD, table_name))
+        status, _ = self.client.describe_index(table_name)
+        assert not status.OK()
+
+    def test_preload(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(OK, table_name))
+        ServiceHandler._preload_table = mock.MagicMock(return_value=OK)
+        status = self.client.preload_table(table_name)
+        assert status.OK()
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(BAD, table_name))
+        status = self.client.preload_table(table_name)
+        assert not status.OK()
+
+    @pytest.mark.skip
+    def test_delete_by_range(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+
+        unpacked = table_name, datetime.datetime.today(
+        ), datetime.datetime.today()
+
+        Parser.parse_proto_DeleteByRangeParam = mock.MagicMock(
+            return_value=(OK, unpacked))
+        ServiceHandler._delete_by_range = mock.MagicMock(return_value=OK)
+        status = self.client.delete_vectors_by_range(
+            *unpacked)
+        assert status.OK()
+
+        Parser.parse_proto_DeleteByRangeParam = mock.MagicMock(
+            return_value=(BAD, unpacked))
+        status = self.client.delete_vectors_by_range(
+            *unpacked)
+        assert not status.OK()
+
+    def test_count_table(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+        count = random.randint(100, 200)
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(OK, table_name))
+        ServiceHandler._count_table = mock.MagicMock(return_value=(OK, count))
+        status, ret = self.client.get_table_row_count(table_name)
+        assert status.OK()
+        assert ret == count
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(BAD, table_name))
+        status, _ = self.client.get_table_row_count(table_name)
+        assert not status.OK()
+
+    def test_show_tables(self, started_app):
+        tables = ['t1', 't2']
+        ServiceHandler._show_tables = mock.MagicMock(return_value=(OK, tables))
+        status, ret = self.client.show_tables()
+        assert status.OK()
+        assert ret == tables
+
+    def test_describe_table(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+        dimension = 128
+        nlist = 1
+        table_schema = TableSchema(table_name=table_name,
+                                   index_file_size=100,
+                                   metric_type=MetricType.L2,
+                                   dimension=dimension)
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(OK, table_schema.table_name))
+        ServiceHandler._describe_table = mock.MagicMock(
+            return_value=(OK, table_schema))
+        status, _ = self.client.describe_table(table_name)
+        assert status.OK()
+
+        ServiceHandler._describe_table = mock.MagicMock(
+            return_value=(BAD, table_schema))
+        status, _ = self.client.describe_table(table_name)
+        assert not status.OK()
+
+        Parser.parse_proto_TableName = mock.MagicMock(return_value=(BAD,
+                                                                    'cmd'))
+        status, ret = self.client.describe_table(table_name)
+        assert not status.OK()
+
+    def test_insert(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+        vectors = [[random.random() for _ in range(16)] for _ in range(10)]
+        ids = [random.randint(1000000, 20000000) for _ in range(10)]
+        ServiceHandler._add_vectors = mock.MagicMock(return_value=(OK, ids))
+        status, ret = self.client.add_vectors(
+            table_name=table_name, records=vectors)
+        assert status.OK()
+        assert ids == ret
+
+    def test_create_index(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+        unpacks = table_name, None
+        Parser.parse_proto_IndexParam = mock.MagicMock(return_value=(OK,
+                                                                     unpacks))
+        ServiceHandler._create_index = mock.MagicMock(return_value=OK)
+        status = self.client.create_index(table_name=table_name)
+        assert status.OK()
+
+        Parser.parse_proto_IndexParam = mock.MagicMock(return_value=(BAD,
+                                                                     None))
+        status = self.client.create_index(table_name=table_name)
+        assert not status.OK()
+
+    def test_drop_table(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(OK, table_name))
+        ServiceHandler._delete_table = mock.MagicMock(return_value=OK)
+        status = self.client.delete_table(table_name=table_name)
+        assert status.OK()
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(BAD, table_name))
+        status = self.client.delete_table(table_name=table_name)
+        assert not status.OK()
+
+    def test_has_table(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(OK, table_name))
+        ServiceHandler._has_table = mock.MagicMock(return_value=(OK, True))
+        has = self.client.has_table(table_name=table_name)
+        assert has
+
+        Parser.parse_proto_TableName = mock.MagicMock(
+            return_value=(BAD, table_name))
+        status, has = self.client.has_table(table_name=table_name)
+        assert not status.OK()
+        assert not has
+
+    def test_create_table(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+        dimension = 128
+        table_schema = dict(table_name=table_name,
+                            index_file_size=100,
+                            metric_type=MetricType.L2,
+                            dimension=dimension)
+
+        ServiceHandler._create_table = mock.MagicMock(return_value=OK)
+        status = self.client.create_table(table_schema)
+        assert status.OK()
+
+        Parser.parse_proto_TableSchema = mock.MagicMock(return_value=(BAD,
+                                                                      None))
+        status = self.client.create_table(table_schema)
+        assert not status.OK()
+
+    def random_data(self, n, dimension):
+        return [[random.random() for _ in range(dimension)] for _ in range(n)]
+
+    def test_search(self, started_app):
+        table_name = inspect.currentframe().f_code.co_name
+        to_index_cnt = random.randint(10, 20)
+        table = TablesFactory(table_id=table_name, state=Tables.NORMAL)
+        to_index_files = TableFilesFactory.create_batch(
+            to_index_cnt, table=table, file_type=TableFiles.FILE_TYPE_TO_INDEX)
+        topk = random.randint(5, 10)
+        nq = random.randint(5, 10)
+        param = {
+            'table_name': table_name,
+            'query_records': self.random_data(nq, table.dimension),
+            'top_k': topk,
+            'nprobe': 2049
+        }
+
+        result = [
+            milvus_pb2.TopKQueryResult(query_result_arrays=[
+                milvus_pb2.QueryResult(id=i, distance=random.random())
+                for i in range(topk)
+            ]) for i in range(nq)
+        ]
+
+        mock_results = milvus_pb2.TopKQueryResultList(status=status_pb2.Status(
+            error_code=status_pb2.SUCCESS, reason="Success"),
+            topk_query_result=result)
+
+        table_schema = TableSchema(table_name=table_name,
+                                   index_file_size=table.index_file_size,
+                                   metric_type=table.metric_type,
+                                   dimension=table.dimension)
+
+        status, _ = self.client.search_vectors(**param)
+        assert status.code == Status.ILLEGAL_ARGUMENT
+
+        param['nprobe'] = 2048
+        RouterMixin.connection = mock.MagicMock(return_value=Milvus())
+        RouterMixin.query_conn = mock.MagicMock(return_value=Milvus())
+        Milvus.describe_table = mock.MagicMock(return_value=(BAD,
+                                                             table_schema))
+        status, ret = self.client.search_vectors(**param)
+        assert status.code == Status.TABLE_NOT_EXISTS
+
+        Milvus.describe_table = mock.MagicMock(return_value=(OK, table_schema))
+        Milvus.search_vectors_in_files = mock.MagicMock(
+            return_value=mock_results)
+
+        status, ret = self.client.search_vectors(**param)
+        assert status.OK()
+        assert len(ret) == nq
diff --git a/shards/mishards/utilities.py b/shards/mishards/utilities.py
new file mode 100644
index 0000000000..42e982b5f1
--- /dev/null
+++ b/shards/mishards/utilities.py
@@ -0,0 +1,20 @@
+import datetime
+from mishards import exceptions
+
+
+def format_date(start, end):
+    return ((start.year - 1900) * 10000 + (start.month - 1) * 100 + start.day,
+            (end.year - 1900) * 10000 + (end.month - 1) * 100 + end.day)
+
+
+def range_to_date(range_obj, metadata=None):
+    try:
+        start = datetime.datetime.strptime(range_obj.start_date, '%Y-%m-%d')
+        end = datetime.datetime.strptime(range_obj.end_date, '%Y-%m-%d')
+        assert start < end
+    except (ValueError, AssertionError):
+        raise exceptions.InvalidRangeError('Invalid time range: {} {}'.format(
+            range_obj.start_date, range_obj.end_date),
+            metadata=metadata)
+
+    return format_date(start, end)
diff --git a/shards/requirements.txt b/shards/requirements.txt
new file mode 100644
index 0000000000..ae224e92ed
--- /dev/null
+++ b/shards/requirements.txt
@@ -0,0 +1,36 @@
+environs==4.2.0
+factory-boy==2.12.0
+Faker==1.0.7
+fire==0.1.3
+google-auth==1.6.3
+grpcio==1.22.0
+grpcio-tools==1.22.0
+kubernetes==10.0.1
+MarkupSafe==1.1.1
+marshmallow==2.19.5
+pymysql==0.9.3
+protobuf==3.9.1
+py==1.8.0
+pyasn1==0.4.7
+pyasn1-modules==0.2.6
+pylint==2.3.1
+pymilvus-test==0.2.28
+#pymilvus==0.2.0
+pyparsing==2.4.0
+pytest==4.6.3
+pytest-level==0.1.1
+pytest-print==0.1.2
+pytest-repeat==0.8.0
+pytest-timeout==1.3.3
+python-dateutil==2.8.0
+python-dotenv==0.10.3
+pytz==2019.1
+requests==2.22.0
+requests-oauthlib==1.2.0
+rsa==4.0
+six==1.12.0
+SQLAlchemy==1.3.5
+urllib3==1.25.3
+jaeger-client>=3.4.0
+grpcio-opentracing>=1.0
+mock==2.0.0
diff --git a/shards/sd/__init__.py b/shards/sd/__init__.py
new file mode 100644
index 0000000000..7943887d0f
--- /dev/null
+++ b/shards/sd/__init__.py
@@ -0,0 +1,28 @@
+import logging
+import inspect
+# from utils import singleton
+
+logger = logging.getLogger(__name__)
+
+
+class ProviderManager:
+    PROVIDERS = {}
+
+    @classmethod
+    def register_service_provider(cls, target):
+        if inspect.isfunction(target):
+            cls.PROVIDERS[target.__name__] = target
+        elif inspect.isclass(target):
+            name = target.__dict__.get('NAME', None)
+            name = name if name else target.__class__.__name__
+            cls.PROVIDERS[name] = target
+        else:
+            assert False, 'Cannot register_service_provider for: {}'.format(target)
+        return target
+
+    @classmethod
+    def get_provider(cls, name):
+        return cls.PROVIDERS.get(name, None)
+
+
+from sd import kubernetes_provider, static_provider
diff --git a/shards/sd/kubernetes_provider.py b/shards/sd/kubernetes_provider.py
new file mode 100644
index 0000000000..eb113db007
--- /dev/null
+++ b/shards/sd/kubernetes_provider.py
@@ -0,0 +1,331 @@
+import os
+import sys
+if __name__ == '__main__':
+    sys.path.append(os.path.dirname(os.path.dirname(
+        os.path.abspath(__file__))))
+
+import re
+import logging
+import time
+import copy
+import threading
+import queue
+import enum
+from kubernetes import client, config, watch
+
+from utils import singleton
+from sd import ProviderManager
+
+logger = logging.getLogger(__name__)
+
+INCLUSTER_NAMESPACE_PATH = '/var/run/secrets/kubernetes.io/serviceaccount/namespace'
+
+
+class EventType(enum.Enum):
+    PodHeartBeat = 1
+    Watch = 2
+
+
+class K8SMixin:
+    def __init__(self, namespace, in_cluster=False, **kwargs):
+        self.namespace = namespace
+        self.in_cluster = in_cluster
+        self.kwargs = kwargs
+        self.v1 = kwargs.get('v1', None)
+        if not self.namespace:
+            self.namespace = open(INCLUSTER_NAMESPACE_PATH).read()
+
+        if not self.v1:
+            config.load_incluster_config(
+            ) if self.in_cluster else config.load_kube_config()
+            self.v1 = client.CoreV1Api()
+
+
+class K8SHeartbeatHandler(threading.Thread, K8SMixin):
+    def __init__(self,
+                 message_queue,
+                 namespace,
+                 label_selector,
+                 in_cluster=False,
+                 **kwargs):
+        K8SMixin.__init__(self,
+                          namespace=namespace,
+                          in_cluster=in_cluster,
+                          **kwargs)
+        threading.Thread.__init__(self)
+        self.queue = message_queue
+        self.terminate = False
+        self.label_selector = label_selector
+        self.poll_interval = kwargs.get('poll_interval', 5)
+
+    def run(self):
+        while not self.terminate:
+            try:
+                pods = self.v1.list_namespaced_pod(
+                    namespace=self.namespace,
+                    label_selector=self.label_selector)
+                event_message = {'eType': EventType.PodHeartBeat, 'events': []}
+                for item in pods.items:
+                    pod = self.v1.read_namespaced_pod(name=item.metadata.name,
+                                                      namespace=self.namespace)
+                    name = pod.metadata.name
+                    ip = pod.status.pod_ip
+                    phase = pod.status.phase
+                    reason = pod.status.reason
+                    message = pod.status.message
+                    ready = True if phase == 'Running' else False
+
+                    pod_event = dict(pod=name,
+                                     ip=ip,
+                                     ready=ready,
+                                     reason=reason,
+                                     message=message)
+
+                    event_message['events'].append(pod_event)
+
+                self.queue.put(event_message)
+
+            except Exception as exc:
+                logger.error(exc)
+
+            time.sleep(self.poll_interval)
+
+    def stop(self):
+        self.terminate = True
+
+
+class K8SEventListener(threading.Thread, K8SMixin):
+    def __init__(self, message_queue, namespace, in_cluster=False, **kwargs):
+        K8SMixin.__init__(self,
+                          namespace=namespace,
+                          in_cluster=in_cluster,
+                          **kwargs)
+        threading.Thread.__init__(self)
+        self.queue = message_queue
+        self.terminate = False
+        self.at_start_up = True
+        self._stop_event = threading.Event()
+
+    def stop(self):
+        self.terminate = True
+        self._stop_event.set()
+
+    def run(self):
+        resource_version = ''
+        w = watch.Watch()
+        for event in w.stream(self.v1.list_namespaced_event,
+                              namespace=self.namespace,
+                              field_selector='involvedObject.kind=Pod'):
+            if self.terminate:
+                break
+
+            resource_version = int(event['object'].metadata.resource_version)
+
+            info = dict(
+                eType=EventType.Watch,
+                pod=event['object'].involved_object.name,
+                reason=event['object'].reason,
+                message=event['object'].message,
+                start_up=self.at_start_up,
+            )
+            self.at_start_up = False
+            # logger.info('Received event: {}'.format(info))
+            self.queue.put(info)
+
+
+class EventHandler(threading.Thread):
+    def __init__(self, mgr, message_queue, namespace, pod_patt, **kwargs):
+        threading.Thread.__init__(self)
+        self.mgr = mgr
+        self.queue = message_queue
+        self.kwargs = kwargs
+        self.terminate = False
+        self.pod_patt = re.compile(pod_patt)
+        self.namespace = namespace
+
+    def stop(self):
+        self.terminate = True
+
+    def on_drop(self, event, **kwargs):
+        pass
+
+    def on_pod_started(self, event, **kwargs):
+        try_cnt = 3
+        pod = None
+        while try_cnt > 0:
+            try_cnt -= 1
+            try:
+                pod = self.mgr.v1.read_namespaced_pod(name=event['pod'],
+                                                      namespace=self.namespace)
+                if not pod.status.pod_ip:
+                    time.sleep(0.5)
+                    continue
+                break
+            except client.rest.ApiException as exc:
+                time.sleep(0.5)
+
+        if try_cnt <= 0 and not pod:
+            if not event['start_up']:
+                logger.error('Pod {} is started but cannot read pod'.format(
+                    event['pod']))
+            return
+        elif try_cnt <= 0 and not pod.status.pod_ip:
+            logger.warning('NoPodIPFoundError')
+            return
+
+        logger.info('Register POD {} with IP {}'.format(
+            pod.metadata.name, pod.status.pod_ip))
+        self.mgr.add_pod(name=pod.metadata.name, ip=pod.status.pod_ip)
+
+    def on_pod_killing(self, event, **kwargs):
+        logger.info('Unregister POD {}'.format(event['pod']))
+        self.mgr.delete_pod(name=event['pod'])
+
+    def on_pod_heartbeat(self, event, **kwargs):
+        names = self.mgr.conn_mgr.conn_names
+
+        running_names = set()
+        for each_event in event['events']:
+            if each_event['ready']:
+                self.mgr.add_pod(name=each_event['pod'], ip=each_event['ip'])
+                running_names.add(each_event['pod'])
+            else:
+                self.mgr.delete_pod(name=each_event['pod'])
+
+        to_delete = names - running_names
+        for name in to_delete:
+            self.mgr.delete_pod(name)
+
+        logger.info(self.mgr.conn_mgr.conn_names)
+
+    def handle_event(self, event):
+        if event['eType'] == EventType.PodHeartBeat:
+            return self.on_pod_heartbeat(event)
+
+        if not event or (event['reason'] not in ('Started', 'Killing')):
+            return self.on_drop(event)
+
+        if not re.match(self.pod_patt, event['pod']):
+            return self.on_drop(event)
+
+        logger.info('Handling event: {}'.format(event))
+
+        if event['reason'] == 'Started':
+            return self.on_pod_started(event)
+
+        return self.on_pod_killing(event)
+
+    def run(self):
+        while not self.terminate:
+            try:
+                event = self.queue.get(timeout=1)
+                self.handle_event(event)
+            except queue.Empty:
+                continue
+
+
+class KubernetesProviderSettings:
+    def __init__(self, namespace, pod_patt, label_selector, in_cluster,
+                 poll_interval, port=None, **kwargs):
+        self.namespace = namespace
+        self.pod_patt = pod_patt
+        self.label_selector = label_selector
+        self.in_cluster = in_cluster
+        self.poll_interval = poll_interval
+        self.port = int(port) if port else 19530
+
+
+@singleton
+@ProviderManager.register_service_provider
+class KubernetesProvider(object):
+    NAME = 'Kubernetes'
+
+    def __init__(self, settings, conn_mgr, **kwargs):
+        self.namespace = settings.namespace
+        self.pod_patt = settings.pod_patt
+        self.label_selector = settings.label_selector
+        self.in_cluster = settings.in_cluster
+        self.poll_interval = settings.poll_interval
+        self.port = settings.port
+        self.kwargs = kwargs
+        self.queue = queue.Queue()
+
+        self.conn_mgr = conn_mgr
+
+        if not self.namespace:
+            self.namespace = open(incluster_namespace_path).read()
+
+        config.load_incluster_config(
+        ) if self.in_cluster else config.load_kube_config()
+        self.v1 = client.CoreV1Api()
+
+        self.listener = K8SEventListener(message_queue=self.queue,
+                                         namespace=self.namespace,
+                                         in_cluster=self.in_cluster,
+                                         v1=self.v1,
+                                         **kwargs)
+
+        self.pod_heartbeater = K8SHeartbeatHandler(
+            message_queue=self.queue,
+            namespace=self.namespace,
+            label_selector=self.label_selector,
+            in_cluster=self.in_cluster,
+            v1=self.v1,
+            poll_interval=self.poll_interval,
+            **kwargs)
+
+        self.event_handler = EventHandler(mgr=self,
+                                          message_queue=self.queue,
+                                          namespace=self.namespace,
+                                          pod_patt=self.pod_patt,
+                                          **kwargs)
+
+    def add_pod(self, name, ip):
+        self.conn_mgr.register(name, 'tcp://{}:{}'.format(ip, self.port))
+
+    def delete_pod(self, name):
+        self.conn_mgr.unregister(name)
+
+    def start(self):
+        self.listener.daemon = True
+        self.listener.start()
+        self.event_handler.start()
+
+        self.pod_heartbeater.start()
+
+    def stop(self):
+        self.listener.stop()
+        self.pod_heartbeater.stop()
+        self.event_handler.stop()
+
+
+if __name__ == '__main__':
+    logging.basicConfig(level=logging.INFO)
+
+    class Connect:
+        def register(self, name, value):
+            logger.error('Register: {} - {}'.format(name, value))
+
+        def unregister(self, name):
+            logger.error('Unregister: {}'.format(name))
+
+        @property
+        def conn_names(self):
+            return set()
+
+    connect_mgr = Connect()
+
+    settings = KubernetesProviderSettings(namespace='xp',
+                                          pod_patt=".*-ro-servers-.*",
+                                          label_selector='tier=ro-servers',
+                                          poll_interval=5,
+                                          in_cluster=False)
+
+    provider_class = ProviderManager.get_provider('Kubernetes')
+    t = provider_class(conn_mgr=connect_mgr, settings=settings)
+    t.start()
+    cnt = 100
+    while cnt > 0:
+        time.sleep(2)
+        cnt -= 1
+    t.stop()
diff --git a/shards/sd/static_provider.py b/shards/sd/static_provider.py
new file mode 100644
index 0000000000..e88780740f
--- /dev/null
+++ b/shards/sd/static_provider.py
@@ -0,0 +1,39 @@
+import os
+import sys
+if __name__ == '__main__':
+    sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+import socket
+from utils import singleton
+from sd import ProviderManager
+
+
+class StaticProviderSettings:
+    def __init__(self, hosts, port=None):
+        self.hosts = hosts
+        self.port = int(port) if port else 19530
+
+
+@singleton
+@ProviderManager.register_service_provider
+class KubernetesProvider(object):
+    NAME = 'Static'
+
+    def __init__(self, settings, conn_mgr, **kwargs):
+        self.conn_mgr = conn_mgr
+        self.hosts = [socket.gethostbyname(host) for host in settings.hosts]
+        self.port = settings.port
+
+    def start(self):
+        for host in self.hosts:
+            self.add_pod(host, host)
+
+    def stop(self):
+        for host in self.hosts:
+            self.delete_pod(host)
+
+    def add_pod(self, name, ip):
+        self.conn_mgr.register(name, 'tcp://{}:{}'.format(ip, self.port))
+
+    def delete_pod(self, name):
+        self.conn_mgr.unregister(name)
diff --git a/shards/setup.cfg b/shards/setup.cfg
new file mode 100644
index 0000000000..4a88432914
--- /dev/null
+++ b/shards/setup.cfg
@@ -0,0 +1,4 @@
+[tool:pytest]
+testpaths = mishards
+log_cli=true
+log_cli_level=info
diff --git a/shards/start_services.yml b/shards/start_services.yml
new file mode 100644
index 0000000000..57fe061bb7
--- /dev/null
+++ b/shards/start_services.yml
@@ -0,0 +1,45 @@
+version: "2.3"
+services:
+    milvus:
+        runtime: nvidia
+        restart: always
+        image: registry.zilliz.com/milvus/engine:branch-0.5.0-release-4316de
+        # ports:
+        #     - "0.0.0.0:19530:19530"
+        volumes:
+            - /tmp/milvus/db:/opt/milvus/db
+
+    jaeger:
+        restart: always
+        image: jaegertracing/all-in-one:1.14
+        ports:
+            - "0.0.0.0:5775:5775/udp"
+            - "0.0.0.0:16686:16686"
+            - "0.0.0.0:9441:9441"
+        environment:
+            COLLECTOR_ZIPKIN_HTTP_PORT: 9411
+
+    mishards:
+        restart: always
+        image: registry.zilliz.com/milvus/mishards:v0.0.4
+        ports:
+            - "0.0.0.0:19530:19531"
+            - "0.0.0.0:19532:19532"
+        volumes:
+            - /tmp/milvus/db:/tmp/milvus/db
+            # - /tmp/mishards_env:/source/mishards/.env
+        command: ["python", "mishards/main.py"]
+        environment:
+            FROM_EXAMPLE: 'true'
+            DEBUG: 'true'
+            SERVER_PORT: 19531
+            WOSERVER: tcp://milvus:19530
+            SD_STATIC_HOSTS: milvus
+            TRACING_TYPE: jaeger
+            TRACING_SERVICE_NAME: mishards-demo
+            TRACING_REPORTING_HOST: jaeger
+            TRACING_REPORTING_PORT: 5775
+
+        depends_on:
+            - milvus
+            - jaeger
diff --git a/shards/tracing/__init__.py b/shards/tracing/__init__.py
new file mode 100644
index 0000000000..64a5b50d15
--- /dev/null
+++ b/shards/tracing/__init__.py
@@ -0,0 +1,43 @@
+from contextlib import contextmanager
+
+
+def empty_server_interceptor_decorator(target_server, interceptor):
+    return target_server
+
+
+@contextmanager
+def EmptySpan(*args, **kwargs):
+    yield None
+    return
+
+
+class Tracer:
+    def __init__(self,
+                 tracer=None,
+                 interceptor=None,
+                 server_decorator=empty_server_interceptor_decorator):
+        self.tracer = tracer
+        self.interceptor = interceptor
+        self.server_decorator = server_decorator
+
+    def decorate(self, server):
+        return self.server_decorator(server, self.interceptor)
+
+    @property
+    def empty(self):
+        return self.tracer is None
+
+    def close(self):
+        self.tracer and self.tracer.close()
+
+    def start_span(self,
+                   operation_name=None,
+                   child_of=None,
+                   references=None,
+                   tags=None,
+                   start_time=None,
+                   ignore_active_span=False):
+        if self.empty:
+            return EmptySpan()
+        return self.tracer.start_span(operation_name, child_of, references,
+                                      tags, start_time, ignore_active_span)
diff --git a/shards/tracing/factory.py b/shards/tracing/factory.py
new file mode 100644
index 0000000000..14fcde2eb3
--- /dev/null
+++ b/shards/tracing/factory.py
@@ -0,0 +1,40 @@
+import logging
+from jaeger_client import Config
+from grpc_opentracing.grpcext import intercept_server
+from grpc_opentracing import open_tracing_server_interceptor
+
+from tracing import (Tracer, empty_server_interceptor_decorator)
+
+logger = logging.getLogger(__name__)
+
+
+class TracerFactory:
+    @classmethod
+    def new_tracer(cls,
+                   tracer_type,
+                   tracer_config,
+                   span_decorator=None,
+                   **kwargs):
+        if not tracer_type:
+            return Tracer()
+        config = tracer_config.TRACING_CONFIG
+        service_name = tracer_config.TRACING_SERVICE_NAME
+        validate = tracer_config.TRACING_VALIDATE
+        # if not tracer_type:
+        #     tracer_type = 'jaeger'
+        #     config = tracer_config.DEFAULT_TRACING_CONFIG
+
+        if tracer_type.lower() == 'jaeger':
+            config = Config(config=config,
+                            service_name=service_name,
+                            validate=validate)
+
+            tracer = config.initialize_tracer()
+            tracer_interceptor = open_tracing_server_interceptor(
+                tracer,
+                log_payloads=tracer_config.TRACING_LOG_PAYLOAD,
+                span_decorator=span_decorator)
+
+            return Tracer(tracer, tracer_interceptor, intercept_server)
+
+        assert False, 'Unsupported tracer type: {}'.format(tracer_type)
diff --git a/shards/utils/__init__.py b/shards/utils/__init__.py
new file mode 100644
index 0000000000..c1d55e76c0
--- /dev/null
+++ b/shards/utils/__init__.py
@@ -0,0 +1,11 @@
+from functools import wraps
+
+
+def singleton(cls):
+    instances = {}
+    @wraps(cls)
+    def getinstance(*args, **kw):
+        if cls not in instances:
+            instances[cls] = cls(*args, **kw)
+        return instances[cls]
+    return getinstance
diff --git a/shards/utils/logger_helper.py b/shards/utils/logger_helper.py
new file mode 100644
index 0000000000..b4e3b9c5b6
--- /dev/null
+++ b/shards/utils/logger_helper.py
@@ -0,0 +1,152 @@
+import os
+import datetime
+from pytz import timezone
+from logging import Filter
+import logging.config
+
+
+class InfoFilter(logging.Filter):
+    def filter(self, rec):
+        return rec.levelno == logging.INFO
+
+
+class DebugFilter(logging.Filter):
+    def filter(self, rec):
+        return rec.levelno == logging.DEBUG
+
+
+class WarnFilter(logging.Filter):
+    def filter(self, rec):
+        return rec.levelno == logging.WARN
+
+
+class ErrorFilter(logging.Filter):
+    def filter(self, rec):
+        return rec.levelno == logging.ERROR
+
+
+class CriticalFilter(logging.Filter):
+    def filter(self, rec):
+        return rec.levelno == logging.CRITICAL
+
+
+COLORS = {
+    'HEADER': '\033[95m',
+    'INFO': '\033[92m',
+    'DEBUG': '\033[94m',
+    'WARNING': '\033[93m',
+    'ERROR': '\033[95m',
+    'CRITICAL': '\033[91m',
+    'ENDC': '\033[0m',
+}
+
+
+class ColorFulFormatColMixin:
+    def format_col(self, message_str, level_name):
+        if level_name in COLORS.keys():
+            message_str = COLORS.get(level_name) + message_str + COLORS.get(
+                'ENDC')
+        return message_str
+
+
+class ColorfulFormatter(logging.Formatter, ColorFulFormatColMixin):
+    def format(self, record):
+        message_str = super(ColorfulFormatter, self).format(record)
+
+        return self.format_col(message_str, level_name=record.levelname)
+
+
+def config(log_level, log_path, name, tz='UTC'):
+    def build_log_file(level, log_path, name, tz):
+        utc_now = datetime.datetime.utcnow()
+        utc_tz = timezone('UTC')
+        local_tz = timezone(tz)
+        tznow = utc_now.replace(tzinfo=utc_tz).astimezone(local_tz)
+        return '{}-{}-{}.log'.format(os.path.join(log_path, name), tznow.strftime("%m-%d-%Y-%H:%M:%S"),
+                                     level)
+
+    if not os.path.exists(log_path):
+        os.makedirs(log_path)
+
+    LOGGING = {
+        'version': 1,
+        'disable_existing_loggers': False,
+        'formatters': {
+            'default': {
+                'format': '%(asctime)s | %(levelname)s | %(name)s | %(threadName)s: %(message)s (%(filename)s:%(lineno)s)',
+            },
+            'colorful_console': {
+                'format': '%(asctime)s | %(levelname)s | %(name)s | %(threadName)s: %(message)s (%(filename)s:%(lineno)s)',
+                '()': ColorfulFormatter,
+            },
+        },
+        'filters': {
+            'InfoFilter': {
+                '()': InfoFilter,
+            },
+            'DebugFilter': {
+                '()': DebugFilter,
+            },
+            'WarnFilter': {
+                '()': WarnFilter,
+            },
+            'ErrorFilter': {
+                '()': ErrorFilter,
+            },
+            'CriticalFilter': {
+                '()': CriticalFilter,
+            },
+        },
+        'handlers': {
+            'milvus_celery_console': {
+                'class': 'logging.StreamHandler',
+                'formatter': 'colorful_console',
+            },
+            'milvus_debug_file': {
+                'level': 'DEBUG',
+                'filters': ['DebugFilter'],
+                'class': 'logging.handlers.RotatingFileHandler',
+                'formatter': 'default',
+                'filename': build_log_file('debug', log_path, name, tz)
+            },
+            'milvus_info_file': {
+                'level': 'INFO',
+                'filters': ['InfoFilter'],
+                'class': 'logging.handlers.RotatingFileHandler',
+                'formatter': 'default',
+                'filename': build_log_file('info', log_path, name, tz)
+            },
+            'milvus_warn_file': {
+                'level': 'WARN',
+                'filters': ['WarnFilter'],
+                'class': 'logging.handlers.RotatingFileHandler',
+                'formatter': 'default',
+                'filename': build_log_file('warn', log_path, name, tz)
+            },
+            'milvus_error_file': {
+                'level': 'ERROR',
+                'filters': ['ErrorFilter'],
+                'class': 'logging.handlers.RotatingFileHandler',
+                'formatter': 'default',
+                'filename': build_log_file('error', log_path, name, tz)
+            },
+            'milvus_critical_file': {
+                'level': 'CRITICAL',
+                'filters': ['CriticalFilter'],
+                'class': 'logging.handlers.RotatingFileHandler',
+                'formatter': 'default',
+                'filename': build_log_file('critical', log_path, name, tz)
+            },
+        },
+        'loggers': {
+            '': {
+                'handlers': ['milvus_celery_console', 'milvus_info_file', 'milvus_debug_file', 'milvus_warn_file',
+                             'milvus_error_file', 'milvus_critical_file'],
+                'level': log_level,
+                'propagate': False
+            },
+        },
+        'propagate': False,
+    }
+
+    logging.config.dictConfig(LOGGING)