enhance: [GoSDK] support update ts caching policy (#40381)

Related to #39093

This PR add update timestamp check and retry policy according to the
design of the related issue

---------

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

client/entity/collection.go

@@ -33,6 +33,9 @@ type Collection struct {
 	ConsistencyLevel ConsistencyLevel
 	ShardNum         int32
 	Properties       map[string]string
+
+	// collection update timestamp, usually used for internal change detection
+	UpdateTimestamp uint64
 }
 
 // Partition represent partition meta in Milvus

client/milvusclient/collection.go

@@ -95,6 +95,7 @@ func (c *Client) DescribeCollection(ctx context.Context, option DescribeCollecti
 			ConsistencyLevel: entity.ConsistencyLevel(resp.ConsistencyLevel),
 			ShardNum:         resp.GetShardsNum(),
 			Properties:       entity.KvPairsMap(resp.GetProperties()),
+			UpdateTimestamp:  resp.GetUpdateTimestamp(),
 		}
 		collection.Name = collection.Schema.CollectionName
 		return nil

client/milvusclient/common.go

@@ -2,9 +2,14 @@ package milvusclient
 
 import (
 	"context"
+	"math"
+
+	"github.com/cockroachdb/errors"
 
 	"github.com/milvus-io/milvus/client/v2/entity"
 	"github.com/milvus-io/milvus/pkg/v2/util/conc"
+	"github.com/milvus-io/milvus/pkg/v2/util/merr"
+	"github.com/milvus-io/milvus/pkg/v2/util/retry"
 	"github.com/milvus-io/milvus/pkg/v2/util/typeutil"
 )
 
@@ -32,6 +37,11 @@ func (c *CollectionCache) GetCollection(ctx context.Context, collName string) (*
 	return coll, err
 }
 
+// Evict removes the collection cache related to the provided collection name.
+func (c *CollectionCache) Evict(collName string) {
+	c.collections.Remove(collName)
+}
+
 // Reset clears all cached info, used when client switching env.
 func (c *CollectionCache) Reset() {
 	c.collections = typeutil.NewConcurrentMap[string, *entity.Collection]()
@@ -47,3 +57,24 @@ func NewCollectionCache(fetcher func(context.Context, string) (*entity.Collectio
 func (c *Client) getCollection(ctx context.Context, collName string) (*entity.Collection, error) {
 	return c.collCache.GetCollection(ctx, collName)
 }
+
+func (c *Client) retryIfSchemaError(ctx context.Context, collName string, work func(ctx context.Context) (uint64, error)) error {
+	var lastTs uint64 = math.MaxUint64
+	return retry.Handle(ctx, func() (bool, error) {
+		ts, err := work(ctx)
+		if err != nil {
+			// if schema error
+			if errors.Is(err, merr.ErrCollectionSchemaMismatch) {
+				sameTs := ts == lastTs
+				lastTs = ts
+				if !sameTs {
+					c.collCache.Evict(collName)
+				}
+				// retry if not same ts
+				return !sameTs, err
+			}
+			return false, err
+		}
+		return false, nil
+	})
+}

client/milvusclient/common_test.go

@@ -0,0 +1,83 @@
+// Licensed to the LF AI & Data foundation under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package milvusclient
+
+import (
+	"context"
+	"sync/atomic"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+
+	"github.com/milvus-io/milvus/pkg/v2/util/merr"
+)
+
+type CommonSuite struct {
+	MockSuiteBase
+}
+
+func (s *CommonSuite) TestRetryIfSchemaError() {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	s.Run("normal_no_error", func() {
+		counter := atomic.Int32{}
+		err := s.client.retryIfSchemaError(ctx, "test_coll", func(ctx context.Context) (uint64, error) {
+			counter.Add(1)
+			return 10, nil
+		})
+		s.NoError(err)
+		s.EqualValues(1, counter.Load())
+	})
+
+	s.Run("other_error", func() {
+		counter := atomic.Int32{}
+		err := s.client.retryIfSchemaError(ctx, "test_coll", func(ctx context.Context) (uint64, error) {
+			counter.Add(1)
+			return 10, merr.WrapErrServiceInternal("mocked")
+		})
+		s.Error(err)
+		s.EqualValues(1, counter.Load())
+	})
+
+	s.Run("transient_schema_err", func() {
+		counter := atomic.Int32{}
+		err := s.client.retryIfSchemaError(ctx, "test_coll", func(ctx context.Context) (uint64, error) {
+			epoch := counter.Load()
+			counter.Add(1)
+			if epoch == 0 {
+				return 10, merr.WrapErrCollectionSchemaMisMatch("mocked")
+			}
+			return 11, nil
+		})
+		s.NoError(err)
+		s.EqualValues(2, counter.Load())
+	})
+
+	s.Run("consistent_schema_err", func() {
+		counter := atomic.Int32{}
+		err := s.client.retryIfSchemaError(ctx, "test_coll", func(ctx context.Context) (uint64, error) {
+			counter.Add(1)
+			return 10, merr.WrapErrCollectionSchemaMisMatch("mocked")
+		})
+		s.Error(err)
+		s.EqualValues(2, counter.Load())
+	})
+}
+
+func TestCommonFunc(t *testing.T) {
+	suite.Run(t, new(CommonSuite))
+}

client/milvusclient/database_example_test.go

@@ -0,0 +1,80 @@
+// Licensed to the LF AI & Data foundation under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// nolint
+package milvusclient_test
+
+import (
+	"context"
+	"log"
+
+	"github.com/milvus-io/milvus/client/v2/milvusclient"
+)
+
+func ExampleClient_CreateDatabase() {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	dbName := `test_db`
+	cli, err := milvusclient.New(ctx, &milvusclient.ClientConfig{
+		Address: milvusAddr,
+	})
+	if err != nil {
+		// handle err
+	}
+
+	err = cli.CreateDatabase(ctx, milvusclient.NewCreateDatabaseOption(dbName))
+	if err != nil {
+		// handle err
+	}
+}
+
+func ExampleClient_CreateDatabase_withProperties() {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	dbName := `test_db_2`
+	cli, err := milvusclient.New(ctx, &milvusclient.ClientConfig{
+		Address: milvusAddr,
+	})
+	if err != nil {
+		// handle err
+	}
+
+	err = cli.CreateDatabase(ctx, milvusclient.NewCreateDatabaseOption(dbName).WithProperty("database.replica.number", 3))
+	if err != nil {
+		// handle err
+	}
+}
+
+func ExampleClient_DescribeDatabase() {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	dbName := `test_db`
+	cli, err := milvusclient.New(ctx, &milvusclient.ClientConfig{
+		Address: milvusAddr,
+	})
+	if err != nil {
+		// handle err
+	}
+
+	db, err := cli.DescribeDatabase(ctx, milvusclient.NewDescribeDatabaseOption(dbName))
+	if err != nil {
+		// handle err
+	}
+	log.Println(db)
+}

client/milvusclient/write.go

@@ -18,6 +18,7 @@ package milvusclient
 
 import (
 	"context"
+	"math"
 
 	"google.golang.org/grpc"
 
@@ -33,16 +34,17 @@ type InsertResult struct {
 
 func (c *Client) Insert(ctx context.Context, option InsertOption, callOptions ...grpc.CallOption) (InsertResult, error) {
 	result := InsertResult{}
+	err := c.retryIfSchemaError(ctx, option.CollectionName(), func(ctx context.Context) (uint64, error) {
 		collection, err := c.getCollection(ctx, option.CollectionName())
 		if err != nil {
-		return result, err
+			return math.MaxUint64, err
 		}
 		req, err := option.InsertRequest(collection)
 		if err != nil {
-		return result, err
+			return collection.UpdateTimestamp, err
 		}
 
-	err = c.callService(func(milvusService milvuspb.MilvusServiceClient) error {
+		return collection.UpdateTimestamp, c.callService(func(milvusService milvuspb.MilvusServiceClient) error {
 			resp, err := milvusService.Insert(ctx, req, callOptions...)
 
 			err = merr.CheckRPCCall(resp, err)
@@ -60,6 +62,7 @@ func (c *Client) Insert(ctx context.Context, option InsertOption, callOptions ..
 			// pks values shall be written back to struct if receiver field exists
 			return option.WriteBackPKs(collection.Schema, result.IDs)
 		})
+	})
 	return result, err
 }
 
@@ -89,15 +92,16 @@ type UpsertResult struct {
 
 func (c *Client) Upsert(ctx context.Context, option UpsertOption, callOptions ...grpc.CallOption) (UpsertResult, error) {
 	result := UpsertResult{}
+	err := c.retryIfSchemaError(ctx, option.CollectionName(), func(ctx context.Context) (uint64, error) {
 		collection, err := c.getCollection(ctx, option.CollectionName())
 		if err != nil {
-		return result, err
+			return math.MaxUint64, err
 		}
 		req, err := option.UpsertRequest(collection)
 		if err != nil {
-		return result, err
+			return collection.UpdateTimestamp, err
 		}
-	err = c.callService(func(milvusService milvuspb.MilvusServiceClient) error {
+		return collection.UpdateTimestamp, c.callService(func(milvusService milvuspb.MilvusServiceClient) error {
 			resp, err := milvusService.Upsert(ctx, req, callOptions...)
 			if err = merr.CheckRPCCall(resp, err); err != nil {
 				return err
@@ -109,5 +113,6 @@ func (c *Client) Upsert(ctx context.Context, option UpsertOption, callOptions ..
 			}
 			return nil
 		})
+	})
 	return result, err
 }

client/milvusclient/write_options.go

@@ -261,6 +261,7 @@ func (opt *columnBasedDataOption) InsertRequest(coll *entity.Collection) (*milvu
 		PartitionName:   opt.partitionName,
 		FieldsData:      fieldsData,
 		NumRows:         uint32(rowNum),
+		SchemaTimestamp: coll.UpdateTimestamp,
 	}, nil
 }
 
@@ -274,6 +275,7 @@ func (opt *columnBasedDataOption) UpsertRequest(coll *entity.Collection) (*milvu
 		PartitionName:   opt.partitionName,
 		FieldsData:      fieldsData,
 		NumRows:         uint32(rowNum),
+		SchemaTimestamp: coll.UpdateTimestamp,
 	}, nil
 }