diff --git a/internal/core/src/pb/milvus.pb.cc b/internal/core/src/pb/milvus.pb.cc
index 184fa86f37..5966b3f2df 100644
--- a/internal/core/src/pb/milvus.pb.cc
+++ b/internal/core/src/pb/milvus.pb.cc
@@ -1525,6 +1525,7 @@ const ::PROTOBUF_NAMESPACE_ID::uint32 TableStruct_milvus_2eproto::offsets[] PROT
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::SearchRequest, output_fields_),
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::SearchRequest, search_params_),
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::SearchRequest, travel_timestamp_),
+  PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::SearchRequest, guarantee_timestamp_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::RetrieveRequest, _internal_metadata_),
   ~0u,  // no _extensions_
@@ -1537,6 +1538,7 @@ const ::PROTOBUF_NAMESPACE_ID::uint32 TableStruct_milvus_2eproto::offsets[] PROT
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::RetrieveRequest, ids_),
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::RetrieveRequest, output_fields_),
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::RetrieveRequest, travel_timestamp_),
+  PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::RetrieveRequest, guarantee_timestamp_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::RetrieveResults, _internal_metadata_),
   ~0u,  // no _extensions_
@@ -1721,25 +1723,25 @@ static const ::PROTOBUF_NAMESPACE_ID::internal::MigrationSchema schemas[] PROTOB
   { 326, -1, sizeof(::milvus::proto::milvus::PlaceholderValue)},
   { 334, -1, sizeof(::milvus::proto::milvus::PlaceholderGroup)},
   { 340, -1, sizeof(::milvus::proto::milvus::SearchRequest)},
-  { 355, -1, sizeof(::milvus::proto::milvus::RetrieveRequest)},
-  { 367, -1, sizeof(::milvus::proto::milvus::RetrieveResults)},
-  { 375, -1, sizeof(::milvus::proto::milvus::Hits)},
-  { 383, -1, sizeof(::milvus::proto::milvus::SearchResults)},
-  { 390, -1, sizeof(::milvus::proto::milvus::FlushRequest)},
-  { 398, 405, sizeof(::milvus::proto::milvus::FlushResponse_CollSegIDsEntry_DoNotUse)},
-  { 407, -1, sizeof(::milvus::proto::milvus::FlushResponse)},
-  { 415, -1, sizeof(::milvus::proto::milvus::QueryRequest)},
-  { 426, -1, sizeof(::milvus::proto::milvus::QueryResults)},
-  { 433, -1, sizeof(::milvus::proto::milvus::PersistentSegmentInfo)},
-  { 443, -1, sizeof(::milvus::proto::milvus::GetPersistentSegmentInfoRequest)},
-  { 451, -1, sizeof(::milvus::proto::milvus::GetPersistentSegmentInfoResponse)},
-  { 458, -1, sizeof(::milvus::proto::milvus::QuerySegmentInfo)},
-  { 470, -1, sizeof(::milvus::proto::milvus::GetQuerySegmentInfoRequest)},
-  { 478, -1, sizeof(::milvus::proto::milvus::GetQuerySegmentInfoResponse)},
-  { 485, -1, sizeof(::milvus::proto::milvus::DummyRequest)},
-  { 491, -1, sizeof(::milvus::proto::milvus::DummyResponse)},
-  { 497, -1, sizeof(::milvus::proto::milvus::RegisterLinkRequest)},
-  { 502, -1, sizeof(::milvus::proto::milvus::RegisterLinkResponse)},
+  { 356, -1, sizeof(::milvus::proto::milvus::RetrieveRequest)},
+  { 369, -1, sizeof(::milvus::proto::milvus::RetrieveResults)},
+  { 377, -1, sizeof(::milvus::proto::milvus::Hits)},
+  { 385, -1, sizeof(::milvus::proto::milvus::SearchResults)},
+  { 392, -1, sizeof(::milvus::proto::milvus::FlushRequest)},
+  { 400, 407, sizeof(::milvus::proto::milvus::FlushResponse_CollSegIDsEntry_DoNotUse)},
+  { 409, -1, sizeof(::milvus::proto::milvus::FlushResponse)},
+  { 417, -1, sizeof(::milvus::proto::milvus::QueryRequest)},
+  { 428, -1, sizeof(::milvus::proto::milvus::QueryResults)},
+  { 435, -1, sizeof(::milvus::proto::milvus::PersistentSegmentInfo)},
+  { 445, -1, sizeof(::milvus::proto::milvus::GetPersistentSegmentInfoRequest)},
+  { 453, -1, sizeof(::milvus::proto::milvus::GetPersistentSegmentInfoResponse)},
+  { 460, -1, sizeof(::milvus::proto::milvus::QuerySegmentInfo)},
+  { 472, -1, sizeof(::milvus::proto::milvus::GetQuerySegmentInfoRequest)},
+  { 480, -1, sizeof(::milvus::proto::milvus::GetQuerySegmentInfoResponse)},
+  { 487, -1, sizeof(::milvus::proto::milvus::DummyRequest)},
+  { 493, -1, sizeof(::milvus::proto::milvus::DummyResponse)},
+  { 499, -1, sizeof(::milvus::proto::milvus::RegisterLinkRequest)},
+  { 504, -1, sizeof(::milvus::proto::milvus::RegisterLinkResponse)},
 };
 
 static ::PROTOBUF_NAMESPACE_ID::Message const * const file_default_instances[] = {
@@ -1938,7 +1940,7 @@ const char descriptor_table_protodef_milvus_2eproto[] PROTOBUF_SECTION_VARIABLE(
   "milvus.proto.milvus.PlaceholderType\022\016\n\006v"
   "alues\030\003 \003(\014\"O\n\020PlaceholderGroup\022;\n\014place"
   "holders\030\001 \003(\0132%.milvus.proto.milvus.Plac"
-  "eholderValue\"\301\002\n\rSearchRequest\022*\n\004base\030\001"
+  "eholderValue\"\336\002\n\rSearchRequest\022*\n\004base\030\001"
   " \001(\0132\034.milvus.proto.common.MsgBase\022\017\n\007db"
   "_name\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\027\n\017"
   "partition_names\030\004 \003(\t\022\013\n\003dsl\030\005 \001(\t\022\031\n\021pl"
@@ -1946,143 +1948,145 @@ const char descriptor_table_protodef_milvus_2eproto[] PROTOBUF_SECTION_VARIABLE(
   "\034.milvus.proto.common.DslType\022\025\n\routput_"
   "fields\030\010 \003(\t\0228\n\rsearch_params\030\t \003(\0132!.mi"
   "lvus.proto.common.KeyValuePair\022\030\n\020travel"
-  "_timestamp\030\n \001(\004\"\330\001\n\017RetrieveRequest\022*\n\004"
-  "base\030\001 \001(\0132\034.milvus.proto.common.MsgBase"
-  "\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_name\030\003 \001"
-  "(\t\022\027\n\017partition_names\030\004 \003(\t\022%\n\003ids\030\005 \001(\013"
-  "2\030.milvus.proto.schema.IDs\022\025\n\routput_fie"
-  "lds\030\006 \003(\t\022\030\n\020travel_timestamp\030\007 \001(\004\"\232\001\n\017"
-  "RetrieveResults\022+\n\006status\030\001 \001(\0132\033.milvus"
-  ".proto.common.Status\022%\n\003ids\030\002 \001(\0132\030.milv"
-  "us.proto.schema.IDs\0223\n\013fields_data\030\003 \003(\013"
-  "2\036.milvus.proto.schema.FieldData\"5\n\004Hits"
-  "\022\013\n\003IDs\030\001 \003(\003\022\020\n\010row_data\030\002 \003(\014\022\016\n\006score"
-  "s\030\003 \003(\002\"t\n\rSearchResults\022+\n\006status\030\001 \001(\013"
-  "2\033.milvus.proto.common.Status\0226\n\007results"
-  "\030\002 \001(\0132%.milvus.proto.schema.SearchResul"
-  "tData\"e\n\014FlushRequest\022*\n\004base\030\001 \001(\0132\034.mi"
-  "lvus.proto.common.MsgBase\022\017\n\007db_name\030\002 \001"
-  "(\t\022\030\n\020collection_names\030\003 \003(\t\"\351\001\n\rFlushRe"
-  "sponse\022+\n\006status\030\001 \001(\0132\033.milvus.proto.co"
-  "mmon.Status\022\017\n\007db_name\030\002 \001(\t\022G\n\013coll_seg"
-  "IDs\030\003 \003(\01322.milvus.proto.milvus.FlushRes"
-  "ponse.CollSegIDsEntry\032Q\n\017CollSegIDsEntry"
-  "\022\013\n\003key\030\001 \001(\t\022-\n\005value\030\002 \001(\0132\036.milvus.pr"
-  "oto.schema.LongArray:\0028\001\"\242\001\n\014QueryReques"
-  "t\022*\n\004base\030\001 \001(\0132\034.milvus.proto.common.Ms"
-  "gBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_nam"
-  "e\030\003 \001(\t\022\014\n\004expr\030\004 \001(\t\022\025\n\routput_fields\030\005"
-  " \003(\t\022\027\n\017partition_names\030\006 \003(\t\"p\n\014QueryRe"
-  "sults\022+\n\006status\030\001 \001(\0132\033.milvus.proto.com"
-  "mon.Status\0223\n\013fields_data\030\002 \003(\0132\036.milvus"
-  ".proto.schema.FieldData\"\231\001\n\025PersistentSe"
-  "gmentInfo\022\021\n\tsegmentID\030\001 \001(\003\022\024\n\014collecti"
-  "onID\030\002 \001(\003\022\023\n\013partitionID\030\003 \001(\003\022\020\n\010num_r"
-  "ows\030\004 \001(\003\0220\n\005state\030\005 \001(\0162!.milvus.proto."
-  "common.SegmentState\"u\n\037GetPersistentSegm"
-  "entInfoRequest\022*\n\004base\030\001 \001(\0132\034.milvus.pr"
-  "oto.common.MsgBase\022\016\n\006dbName\030\002 \001(\t\022\026\n\016co"
-  "llectionName\030\003 \001(\t\"\212\001\n GetPersistentSegm"
-  "entInfoResponse\022+\n\006status\030\001 \001(\0132\033.milvus"
-  ".proto.common.Status\0229\n\005infos\030\002 \003(\0132*.mi"
-  "lvus.proto.milvus.PersistentSegmentInfo\""
-  "\231\001\n\020QuerySegmentInfo\022\021\n\tsegmentID\030\001 \001(\003\022"
-  "\024\n\014collectionID\030\002 \001(\003\022\023\n\013partitionID\030\003 \001"
-  "(\003\022\020\n\010mem_size\030\004 \001(\003\022\020\n\010num_rows\030\005 \001(\003\022\022"
-  "\n\nindex_name\030\006 \001(\t\022\017\n\007indexID\030\007 \001(\003\"p\n\032G"
-  "etQuerySegmentInfoRequest\022*\n\004base\030\001 \001(\0132"
-  "\034.milvus.proto.common.MsgBase\022\016\n\006dbName\030"
-  "\002 \001(\t\022\026\n\016collectionName\030\003 \001(\t\"\200\001\n\033GetQue"
-  "rySegmentInfoResponse\022+\n\006status\030\001 \001(\0132\033."
-  "milvus.proto.common.Status\0224\n\005infos\030\002 \003("
-  "\0132%.milvus.proto.milvus.QuerySegmentInfo"
-  "\"$\n\014DummyRequest\022\024\n\014request_type\030\001 \001(\t\"!"
-  "\n\rDummyResponse\022\020\n\010response\030\001 \001(\t\"\025\n\023Reg"
-  "isterLinkRequest\"r\n\024RegisterLinkResponse"
-  "\022-\n\007address\030\001 \001(\0132\034.milvus.proto.common."
-  "Address\022+\n\006status\030\002 \001(\0132\033.milvus.proto.c"
-  "ommon.Status*,\n\023ShowCollectionsType\022\007\n\003A"
-  "ll\020\000\022\014\n\010InMemory\020\001*>\n\017PlaceholderType\022\010\n"
-  "\004None\020\000\022\020\n\014BinaryVector\020d\022\017\n\013FloatVector"
-  "\020e2\224\027\n\rMilvusService\022_\n\020CreateCollection"
-  "\022,.milvus.proto.milvus.CreateCollectionR"
-  "equest\032\033.milvus.proto.common.Status\"\000\022[\n"
-  "\016DropCollection\022*.milvus.proto.milvus.Dr"
-  "opCollectionRequest\032\033.milvus.proto.commo"
-  "n.Status\"\000\022_\n\rHasCollection\022).milvus.pro"
-  "to.milvus.HasCollectionRequest\032!.milvus."
-  "proto.milvus.BoolResponse\"\000\022[\n\016LoadColle"
-  "ction\022*.milvus.proto.milvus.LoadCollecti"
-  "onRequest\032\033.milvus.proto.common.Status\"\000"
-  "\022a\n\021ReleaseCollection\022-.milvus.proto.mil"
-  "vus.ReleaseCollectionRequest\032\033.milvus.pr"
-  "oto.common.Status\"\000\022w\n\022DescribeCollectio"
-  "n\022..milvus.proto.milvus.DescribeCollecti"
-  "onRequest\032/.milvus.proto.milvus.Describe"
-  "CollectionResponse\"\000\022\206\001\n\027GetCollectionSt"
-  "atistics\0223.milvus.proto.milvus.GetCollec"
-  "tionStatisticsRequest\0324.milvus.proto.mil"
-  "vus.GetCollectionStatisticsResponse\"\000\022n\n"
-  "\017ShowCollections\022+.milvus.proto.milvus.S"
-  "howCollectionsRequest\032,.milvus.proto.mil"
-  "vus.ShowCollectionsResponse\"\000\022]\n\017CreateP"
-  "artition\022+.milvus.proto.milvus.CreatePar"
-  "titionRequest\032\033.milvus.proto.common.Stat"
-  "us\"\000\022Y\n\rDropPartition\022).milvus.proto.mil"
-  "vus.DropPartitionRequest\032\033.milvus.proto."
-  "common.Status\"\000\022]\n\014HasPartition\022(.milvus"
-  ".proto.milvus.HasPartitionRequest\032!.milv"
-  "us.proto.milvus.BoolResponse\"\000\022[\n\016LoadPa"
-  "rtitions\022*.milvus.proto.milvus.LoadParti"
-  "tionsRequest\032\033.milvus.proto.common.Statu"
-  "s\"\000\022a\n\021ReleasePartitions\022-.milvus.proto."
-  "milvus.ReleasePartitionsRequest\032\033.milvus"
-  ".proto.common.Status\"\000\022\203\001\n\026GetPartitionS"
-  "tatistics\0222.milvus.proto.milvus.GetParti"
-  "tionStatisticsRequest\0323.milvus.proto.mil"
-  "vus.GetPartitionStatisticsResponse\"\000\022k\n\016"
-  "ShowPartitions\022*.milvus.proto.milvus.Sho"
-  "wPartitionsRequest\032+.milvus.proto.milvus"
-  ".ShowPartitionsResponse\"\000\022U\n\013CreateIndex"
-  "\022\'.milvus.proto.milvus.CreateIndexReques"
-  "t\032\033.milvus.proto.common.Status\"\000\022h\n\rDesc"
-  "ribeIndex\022).milvus.proto.milvus.Describe"
-  "IndexRequest\032*.milvus.proto.milvus.Descr"
-  "ibeIndexResponse\"\000\022h\n\rGetIndexState\022).mi"
-  "lvus.proto.milvus.GetIndexStateRequest\032*"
-  ".milvus.proto.milvus.GetIndexStateRespon"
-  "se\"\000\022\200\001\n\025GetIndexBuildProgress\0221.milvus."
-  "proto.milvus.GetIndexBuildProgressReques"
-  "t\0322.milvus.proto.milvus.GetIndexBuildPro"
-  "gressResponse\"\000\022Q\n\tDropIndex\022%.milvus.pr"
-  "oto.milvus.DropIndexRequest\032\033.milvus.pro"
-  "to.common.Status\"\000\022S\n\006Insert\022\".milvus.pr"
-  "oto.milvus.InsertRequest\032#.milvus.proto."
-  "milvus.MutationResult\"\000\022R\n\006Search\022\".milv"
-  "us.proto.milvus.SearchRequest\032\".milvus.p"
-  "roto.milvus.SearchResults\"\000\022X\n\010Retrieve\022"
-  "$.milvus.proto.milvus.RetrieveRequest\032$."
-  "milvus.proto.milvus.RetrieveResults\"\000\022P\n"
-  "\005Flush\022!.milvus.proto.milvus.FlushReques"
-  "t\032\".milvus.proto.milvus.FlushResponse\"\000\022"
-  "O\n\005Query\022!.milvus.proto.milvus.QueryRequ"
-  "est\032!.milvus.proto.milvus.QueryResults\"\000"
-  "\022\211\001\n\030GetPersistentSegmentInfo\0224.milvus.p"
-  "roto.milvus.GetPersistentSegmentInfoRequ"
-  "est\0325.milvus.proto.milvus.GetPersistentS"
-  "egmentInfoResponse\"\000\022z\n\023GetQuerySegmentI"
-  "nfo\022/.milvus.proto.milvus.GetQuerySegmen"
-  "tInfoRequest\0320.milvus.proto.milvus.GetQu"
-  "erySegmentInfoResponse\"\000\022P\n\005Dummy\022!.milv"
-  "us.proto.milvus.DummyRequest\032\".milvus.pr"
-  "oto.milvus.DummyResponse\"\000\022e\n\014RegisterLi"
-  "nk\022(.milvus.proto.milvus.RegisterLinkReq"
-  "uest\032).milvus.proto.milvus.RegisterLinkR"
-  "esponse\"\0002u\n\014ProxyService\022e\n\014RegisterLin"
-  "k\022(.milvus.proto.milvus.RegisterLinkRequ"
-  "est\032).milvus.proto.milvus.RegisterLinkRe"
-  "sponse\"\000B5Z3github.com/milvus-io/milvus/"
-  "internal/proto/milvuspbb\006proto3"
+  "_timestamp\030\n \001(\004\022\033\n\023guarantee_timestamp\030"
+  "\013 \001(\004\"\365\001\n\017RetrieveRequest\022*\n\004base\030\001 \001(\0132"
+  "\034.milvus.proto.common.MsgBase\022\017\n\007db_name"
+  "\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\027\n\017parti"
+  "tion_names\030\004 \003(\t\022%\n\003ids\030\005 \001(\0132\030.milvus.p"
+  "roto.schema.IDs\022\025\n\routput_fields\030\006 \003(\t\022\030"
+  "\n\020travel_timestamp\030\007 \001(\004\022\033\n\023guarantee_ti"
+  "mestamp\030\010 \001(\004\"\232\001\n\017RetrieveResults\022+\n\006sta"
+  "tus\030\001 \001(\0132\033.milvus.proto.common.Status\022%"
+  "\n\003ids\030\002 \001(\0132\030.milvus.proto.schema.IDs\0223\n"
+  "\013fields_data\030\003 \003(\0132\036.milvus.proto.schema"
+  ".FieldData\"5\n\004Hits\022\013\n\003IDs\030\001 \003(\003\022\020\n\010row_d"
+  "ata\030\002 \003(\014\022\016\n\006scores\030\003 \003(\002\"t\n\rSearchResul"
+  "ts\022+\n\006status\030\001 \001(\0132\033.milvus.proto.common"
+  ".Status\0226\n\007results\030\002 \001(\0132%.milvus.proto."
+  "schema.SearchResultData\"e\n\014FlushRequest\022"
+  "*\n\004base\030\001 \001(\0132\034.milvus.proto.common.MsgB"
+  "ase\022\017\n\007db_name\030\002 \001(\t\022\030\n\020collection_names"
+  "\030\003 \003(\t\"\351\001\n\rFlushResponse\022+\n\006status\030\001 \001(\013"
+  "2\033.milvus.proto.common.Status\022\017\n\007db_name"
+  "\030\002 \001(\t\022G\n\013coll_segIDs\030\003 \003(\01322.milvus.pro"
+  "to.milvus.FlushResponse.CollSegIDsEntry\032"
+  "Q\n\017CollSegIDsEntry\022\013\n\003key\030\001 \001(\t\022-\n\005value"
+  "\030\002 \001(\0132\036.milvus.proto.schema.LongArray:\002"
+  "8\001\"\242\001\n\014QueryRequest\022*\n\004base\030\001 \001(\0132\034.milv"
+  "us.proto.common.MsgBase\022\017\n\007db_name\030\002 \001(\t"
+  "\022\027\n\017collection_name\030\003 \001(\t\022\014\n\004expr\030\004 \001(\t\022"
+  "\025\n\routput_fields\030\005 \003(\t\022\027\n\017partition_name"
+  "s\030\006 \003(\t\"p\n\014QueryResults\022+\n\006status\030\001 \001(\0132"
+  "\033.milvus.proto.common.Status\0223\n\013fields_d"
+  "ata\030\002 \003(\0132\036.milvus.proto.schema.FieldDat"
+  "a\"\231\001\n\025PersistentSegmentInfo\022\021\n\tsegmentID"
+  "\030\001 \001(\003\022\024\n\014collectionID\030\002 \001(\003\022\023\n\013partitio"
+  "nID\030\003 \001(\003\022\020\n\010num_rows\030\004 \001(\003\0220\n\005state\030\005 \001"
+  "(\0162!.milvus.proto.common.SegmentState\"u\n"
+  "\037GetPersistentSegmentInfoRequest\022*\n\004base"
+  "\030\001 \001(\0132\034.milvus.proto.common.MsgBase\022\016\n\006"
+  "dbName\030\002 \001(\t\022\026\n\016collectionName\030\003 \001(\t\"\212\001\n"
+  " GetPersistentSegmentInfoResponse\022+\n\006sta"
+  "tus\030\001 \001(\0132\033.milvus.proto.common.Status\0229"
+  "\n\005infos\030\002 \003(\0132*.milvus.proto.milvus.Pers"
+  "istentSegmentInfo\"\231\001\n\020QuerySegmentInfo\022\021"
+  "\n\tsegmentID\030\001 \001(\003\022\024\n\014collectionID\030\002 \001(\003\022"
+  "\023\n\013partitionID\030\003 \001(\003\022\020\n\010mem_size\030\004 \001(\003\022\020"
+  "\n\010num_rows\030\005 \001(\003\022\022\n\nindex_name\030\006 \001(\t\022\017\n\007"
+  "indexID\030\007 \001(\003\"p\n\032GetQuerySegmentInfoRequ"
+  "est\022*\n\004base\030\001 \001(\0132\034.milvus.proto.common."
+  "MsgBase\022\016\n\006dbName\030\002 \001(\t\022\026\n\016collectionNam"
+  "e\030\003 \001(\t\"\200\001\n\033GetQuerySegmentInfoResponse\022"
+  "+\n\006status\030\001 \001(\0132\033.milvus.proto.common.St"
+  "atus\0224\n\005infos\030\002 \003(\0132%.milvus.proto.milvu"
+  "s.QuerySegmentInfo\"$\n\014DummyRequest\022\024\n\014re"
+  "quest_type\030\001 \001(\t\"!\n\rDummyResponse\022\020\n\010res"
+  "ponse\030\001 \001(\t\"\025\n\023RegisterLinkRequest\"r\n\024Re"
+  "gisterLinkResponse\022-\n\007address\030\001 \001(\0132\034.mi"
+  "lvus.proto.common.Address\022+\n\006status\030\002 \001("
+  "\0132\033.milvus.proto.common.Status*,\n\023ShowCo"
+  "llectionsType\022\007\n\003All\020\000\022\014\n\010InMemory\020\001*>\n\017"
+  "PlaceholderType\022\010\n\004None\020\000\022\020\n\014BinaryVecto"
+  "r\020d\022\017\n\013FloatVector\020e2\224\027\n\rMilvusService\022_"
+  "\n\020CreateCollection\022,.milvus.proto.milvus"
+  ".CreateCollectionRequest\032\033.milvus.proto."
+  "common.Status\"\000\022[\n\016DropCollection\022*.milv"
+  "us.proto.milvus.DropCollectionRequest\032\033."
+  "milvus.proto.common.Status\"\000\022_\n\rHasColle"
+  "ction\022).milvus.proto.milvus.HasCollectio"
+  "nRequest\032!.milvus.proto.milvus.BoolRespo"
+  "nse\"\000\022[\n\016LoadCollection\022*.milvus.proto.m"
+  "ilvus.LoadCollectionRequest\032\033.milvus.pro"
+  "to.common.Status\"\000\022a\n\021ReleaseCollection\022"
+  "-.milvus.proto.milvus.ReleaseCollectionR"
+  "equest\032\033.milvus.proto.common.Status\"\000\022w\n"
+  "\022DescribeCollection\022..milvus.proto.milvu"
+  "s.DescribeCollectionRequest\032/.milvus.pro"
+  "to.milvus.DescribeCollectionResponse\"\000\022\206"
+  "\001\n\027GetCollectionStatistics\0223.milvus.prot"
+  "o.milvus.GetCollectionStatisticsRequest\032"
+  "4.milvus.proto.milvus.GetCollectionStati"
+  "sticsResponse\"\000\022n\n\017ShowCollections\022+.mil"
+  "vus.proto.milvus.ShowCollectionsRequest\032"
+  ",.milvus.proto.milvus.ShowCollectionsRes"
+  "ponse\"\000\022]\n\017CreatePartition\022+.milvus.prot"
+  "o.milvus.CreatePartitionRequest\032\033.milvus"
+  ".proto.common.Status\"\000\022Y\n\rDropPartition\022"
+  ").milvus.proto.milvus.DropPartitionReque"
+  "st\032\033.milvus.proto.common.Status\"\000\022]\n\014Has"
+  "Partition\022(.milvus.proto.milvus.HasParti"
+  "tionRequest\032!.milvus.proto.milvus.BoolRe"
+  "sponse\"\000\022[\n\016LoadPartitions\022*.milvus.prot"
+  "o.milvus.LoadPartitionsRequest\032\033.milvus."
+  "proto.common.Status\"\000\022a\n\021ReleasePartitio"
+  "ns\022-.milvus.proto.milvus.ReleasePartitio"
+  "nsRequest\032\033.milvus.proto.common.Status\"\000"
+  "\022\203\001\n\026GetPartitionStatistics\0222.milvus.pro"
+  "to.milvus.GetPartitionStatisticsRequest\032"
+  "3.milvus.proto.milvus.GetPartitionStatis"
+  "ticsResponse\"\000\022k\n\016ShowPartitions\022*.milvu"
+  "s.proto.milvus.ShowPartitionsRequest\032+.m"
+  "ilvus.proto.milvus.ShowPartitionsRespons"
+  "e\"\000\022U\n\013CreateIndex\022\'.milvus.proto.milvus"
+  ".CreateIndexRequest\032\033.milvus.proto.commo"
+  "n.Status\"\000\022h\n\rDescribeIndex\022).milvus.pro"
+  "to.milvus.DescribeIndexRequest\032*.milvus."
+  "proto.milvus.DescribeIndexResponse\"\000\022h\n\r"
+  "GetIndexState\022).milvus.proto.milvus.GetI"
+  "ndexStateRequest\032*.milvus.proto.milvus.G"
+  "etIndexStateResponse\"\000\022\200\001\n\025GetIndexBuild"
+  "Progress\0221.milvus.proto.milvus.GetIndexB"
+  "uildProgressRequest\0322.milvus.proto.milvu"
+  "s.GetIndexBuildProgressResponse\"\000\022Q\n\tDro"
+  "pIndex\022%.milvus.proto.milvus.DropIndexRe"
+  "quest\032\033.milvus.proto.common.Status\"\000\022S\n\006"
+  "Insert\022\".milvus.proto.milvus.InsertReque"
+  "st\032#.milvus.proto.milvus.MutationResult\""
+  "\000\022R\n\006Search\022\".milvus.proto.milvus.Search"
+  "Request\032\".milvus.proto.milvus.SearchResu"
+  "lts\"\000\022X\n\010Retrieve\022$.milvus.proto.milvus."
+  "RetrieveRequest\032$.milvus.proto.milvus.Re"
+  "trieveResults\"\000\022P\n\005Flush\022!.milvus.proto."
+  "milvus.FlushRequest\032\".milvus.proto.milvu"
+  "s.FlushResponse\"\000\022O\n\005Query\022!.milvus.prot"
+  "o.milvus.QueryRequest\032!.milvus.proto.mil"
+  "vus.QueryResults\"\000\022\211\001\n\030GetPersistentSegm"
+  "entInfo\0224.milvus.proto.milvus.GetPersist"
+  "entSegmentInfoRequest\0325.milvus.proto.mil"
+  "vus.GetPersistentSegmentInfoResponse\"\000\022z"
+  "\n\023GetQuerySegmentInfo\022/.milvus.proto.mil"
+  "vus.GetQuerySegmentInfoRequest\0320.milvus."
+  "proto.milvus.GetQuerySegmentInfoResponse"
+  "\"\000\022P\n\005Dummy\022!.milvus.proto.milvus.DummyR"
+  "equest\032\".milvus.proto.milvus.DummyRespon"
+  "se\"\000\022e\n\014RegisterLink\022(.milvus.proto.milv"
+  "us.RegisterLinkRequest\032).milvus.proto.mi"
+  "lvus.RegisterLinkResponse\"\0002u\n\014ProxyServ"
+  "ice\022e\n\014RegisterLink\022(.milvus.proto.milvu"
+  "s.RegisterLinkRequest\032).milvus.proto.mil"
+  "vus.RegisterLinkResponse\"\000B5Z3github.com"
+  "/milvus-io/milvus/internal/proto/milvusp"
+  "bb\006proto3"
   ;
 static const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable*const descriptor_table_milvus_2eproto_deps[2] = {
   &::descriptor_table_common_2eproto,
@@ -2152,7 +2156,7 @@ static ::PROTOBUF_NAMESPACE_ID::internal::SCCInfoBase*const descriptor_table_mil
 static ::PROTOBUF_NAMESPACE_ID::internal::once_flag descriptor_table_milvus_2eproto_once;
 static bool descriptor_table_milvus_2eproto_initialized = false;
 const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable descriptor_table_milvus_2eproto = {
-  &descriptor_table_milvus_2eproto_initialized, descriptor_table_protodef_milvus_2eproto, "milvus.proto", 11111,
+  &descriptor_table_milvus_2eproto_initialized, descriptor_table_protodef_milvus_2eproto, "milvus.proto", 11169,
   &descriptor_table_milvus_2eproto_once, descriptor_table_milvus_2eproto_sccs, descriptor_table_milvus_2eproto_deps, 59, 2,
   schemas, file_default_instances, TableStruct_milvus_2eproto::offsets,
   file_level_metadata_milvus_2eproto, 59, file_level_enum_descriptors_milvus_2eproto, file_level_service_descriptors_milvus_2eproto,
@@ -19135,6 +19139,13 @@ const char* SearchRequest::_InternalParse(const char* ptr, ::PROTOBUF_NAMESPACE_
           CHK_(ptr);
         } else goto handle_unusual;
         continue;
+      // uint64 guarantee_timestamp = 11;
+      case 11:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<::PROTOBUF_NAMESPACE_ID::uint8>(tag) == 88)) {
+          guarantee_timestamp_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint(&ptr);
+          CHK_(ptr);
+        } else goto handle_unusual;
+        continue;
       default: {
       handle_unusual:
         if ((tag & 7) == 4 || tag == 0) {
@@ -19302,6 +19313,19 @@ bool SearchRequest::MergePartialFromCodedStream(
         break;
       }
 
+      // uint64 guarantee_timestamp = 11;
+      case 11: {
+        if (static_cast< ::PROTOBUF_NAMESPACE_ID::uint8>(tag) == (88 & 0xFF)) {
+
+          DO_((::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::ReadPrimitive<
+                   ::PROTOBUF_NAMESPACE_ID::uint64, ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_UINT64>(
+                 input, &guarantee_timestamp_)));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
       default: {
       handle_unusual:
         if (tag == 0) {
@@ -19411,6 +19435,11 @@ void SearchRequest::SerializeWithCachedSizes(
     ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64(10, this->travel_timestamp(), output);
   }
 
+  // uint64 guarantee_timestamp = 11;
+  if (this->guarantee_timestamp() != 0) {
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64(11, this->guarantee_timestamp(), output);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     ::PROTOBUF_NAMESPACE_ID::internal::WireFormat::SerializeUnknownFields(
         _internal_metadata_.unknown_fields(), output);
@@ -19510,6 +19539,11 @@ void SearchRequest::SerializeWithCachedSizes(
     target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64ToArray(10, this->travel_timestamp(), target);
   }
 
+  // uint64 guarantee_timestamp = 11;
+  if (this->guarantee_timestamp() != 0) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64ToArray(11, this->guarantee_timestamp(), target);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormat::SerializeUnknownFieldsToArray(
         _internal_metadata_.unknown_fields(), target);
@@ -19600,6 +19634,13 @@ size_t SearchRequest::ByteSizeLong() const {
         this->travel_timestamp());
   }
 
+  // uint64 guarantee_timestamp = 11;
+  if (this->guarantee_timestamp() != 0) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::UInt64Size(
+        this->guarantee_timestamp());
+  }
+
   // .milvus.proto.common.DslType dsl_type = 7;
   if (this->dsl_type() != 0) {
     total_size += 1 +
@@ -19658,6 +19699,9 @@ void SearchRequest::MergeFrom(const SearchRequest& from) {
   if (from.travel_timestamp() != 0) {
     set_travel_timestamp(from.travel_timestamp());
   }
+  if (from.guarantee_timestamp() != 0) {
+    set_guarantee_timestamp(from.guarantee_timestamp());
+  }
   if (from.dsl_type() != 0) {
     set_dsl_type(from.dsl_type());
   }
@@ -19697,6 +19741,7 @@ void SearchRequest::InternalSwap(SearchRequest* other) {
     GetArenaNoVirtual());
   swap(base_, other->base_);
   swap(travel_timestamp_, other->travel_timestamp_);
+  swap(guarantee_timestamp_, other->guarantee_timestamp_);
   swap(dsl_type_, other->dsl_type_);
 }
 
@@ -19768,7 +19813,9 @@ RetrieveRequest::RetrieveRequest(const RetrieveRequest& from)
   } else {
     ids_ = nullptr;
   }
-  travel_timestamp_ = from.travel_timestamp_;
+  ::memcpy(&travel_timestamp_, &from.travel_timestamp_,
+    static_cast<size_t>(reinterpret_cast<char*>(&guarantee_timestamp_) -
+    reinterpret_cast<char*>(&travel_timestamp_)) + sizeof(guarantee_timestamp_));
   // @@protoc_insertion_point(copy_constructor:milvus.proto.milvus.RetrieveRequest)
 }
 
@@ -19777,8 +19824,8 @@ void RetrieveRequest::SharedCtor() {
   db_name_.UnsafeSetDefault(&::PROTOBUF_NAMESPACE_ID::internal::GetEmptyStringAlreadyInited());
   collection_name_.UnsafeSetDefault(&::PROTOBUF_NAMESPACE_ID::internal::GetEmptyStringAlreadyInited());
   ::memset(&base_, 0, static_cast<size_t>(
-      reinterpret_cast<char*>(&travel_timestamp_) -
-      reinterpret_cast<char*>(&base_)) + sizeof(travel_timestamp_));
+      reinterpret_cast<char*>(&guarantee_timestamp_) -
+      reinterpret_cast<char*>(&base_)) + sizeof(guarantee_timestamp_));
 }
 
 RetrieveRequest::~RetrieveRequest() {
@@ -19820,7 +19867,9 @@ void RetrieveRequest::Clear() {
     delete ids_;
   }
   ids_ = nullptr;
-  travel_timestamp_ = PROTOBUF_ULONGLONG(0);
+  ::memset(&travel_timestamp_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&guarantee_timestamp_) -
+      reinterpret_cast<char*>(&travel_timestamp_)) + sizeof(guarantee_timestamp_));
   _internal_metadata_.Clear();
 }
 
@@ -19891,6 +19940,13 @@ const char* RetrieveRequest::_InternalParse(const char* ptr, ::PROTOBUF_NAMESPAC
           CHK_(ptr);
         } else goto handle_unusual;
         continue;
+      // uint64 guarantee_timestamp = 8;
+      case 8:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<::PROTOBUF_NAMESPACE_ID::uint8>(tag) == 64)) {
+          guarantee_timestamp_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint(&ptr);
+          CHK_(ptr);
+        } else goto handle_unusual;
+        continue;
       default: {
       handle_unusual:
         if ((tag & 7) == 4 || tag == 0) {
@@ -20018,6 +20074,19 @@ bool RetrieveRequest::MergePartialFromCodedStream(
         break;
       }
 
+      // uint64 guarantee_timestamp = 8;
+      case 8: {
+        if (static_cast< ::PROTOBUF_NAMESPACE_ID::uint8>(tag) == (64 & 0xFF)) {
+
+          DO_((::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::ReadPrimitive<
+                   ::PROTOBUF_NAMESPACE_ID::uint64, ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_UINT64>(
+                 input, &guarantee_timestamp_)));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
       default: {
       handle_unusual:
         if (tag == 0) {
@@ -20102,6 +20171,11 @@ void RetrieveRequest::SerializeWithCachedSizes(
     ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64(7, this->travel_timestamp(), output);
   }
 
+  // uint64 guarantee_timestamp = 8;
+  if (this->guarantee_timestamp() != 0) {
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64(8, this->guarantee_timestamp(), output);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     ::PROTOBUF_NAMESPACE_ID::internal::WireFormat::SerializeUnknownFields(
         _internal_metadata_.unknown_fields(), output);
@@ -20176,6 +20250,11 @@ void RetrieveRequest::SerializeWithCachedSizes(
     target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64ToArray(7, this->travel_timestamp(), target);
   }
 
+  // uint64 guarantee_timestamp = 8;
+  if (this->guarantee_timestamp() != 0) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64ToArray(8, this->guarantee_timestamp(), target);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormat::SerializeUnknownFieldsToArray(
         _internal_metadata_.unknown_fields(), target);
@@ -20248,6 +20327,13 @@ size_t RetrieveRequest::ByteSizeLong() const {
         this->travel_timestamp());
   }
 
+  // uint64 guarantee_timestamp = 8;
+  if (this->guarantee_timestamp() != 0) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::UInt64Size(
+        this->guarantee_timestamp());
+  }
+
   int cached_size = ::PROTOBUF_NAMESPACE_ID::internal::ToCachedSize(total_size);
   SetCachedSize(cached_size);
   return total_size;
@@ -20294,6 +20380,9 @@ void RetrieveRequest::MergeFrom(const RetrieveRequest& from) {
   if (from.travel_timestamp() != 0) {
     set_travel_timestamp(from.travel_timestamp());
   }
+  if (from.guarantee_timestamp() != 0) {
+    set_guarantee_timestamp(from.guarantee_timestamp());
+  }
 }
 
 void RetrieveRequest::CopyFrom(const ::PROTOBUF_NAMESPACE_ID::Message& from) {
@@ -20326,6 +20415,7 @@ void RetrieveRequest::InternalSwap(RetrieveRequest* other) {
   swap(base_, other->base_);
   swap(ids_, other->ids_);
   swap(travel_timestamp_, other->travel_timestamp_);
+  swap(guarantee_timestamp_, other->guarantee_timestamp_);
 }
 
 ::PROTOBUF_NAMESPACE_ID::Metadata RetrieveRequest::GetMetadata() const {
diff --git a/internal/core/src/pb/milvus.pb.h b/internal/core/src/pb/milvus.pb.h
index 69967093b2..446a9bf2d9 100644
--- a/internal/core/src/pb/milvus.pb.h
+++ b/internal/core/src/pb/milvus.pb.h
@@ -6976,6 +6976,7 @@ class SearchRequest :
     kPlaceholderGroupFieldNumber = 6,
     kBaseFieldNumber = 1,
     kTravelTimestampFieldNumber = 10,
+    kGuaranteeTimestampFieldNumber = 11,
     kDslTypeFieldNumber = 7,
   };
   // repeated string partition_names = 4;
@@ -7080,6 +7081,11 @@ class SearchRequest :
   ::PROTOBUF_NAMESPACE_ID::uint64 travel_timestamp() const;
   void set_travel_timestamp(::PROTOBUF_NAMESPACE_ID::uint64 value);
 
+  // uint64 guarantee_timestamp = 11;
+  void clear_guarantee_timestamp();
+  ::PROTOBUF_NAMESPACE_ID::uint64 guarantee_timestamp() const;
+  void set_guarantee_timestamp(::PROTOBUF_NAMESPACE_ID::uint64 value);
+
   // .milvus.proto.common.DslType dsl_type = 7;
   void clear_dsl_type();
   ::milvus::proto::common::DslType dsl_type() const;
@@ -7099,6 +7105,7 @@ class SearchRequest :
   ::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr placeholder_group_;
   ::milvus::proto::common::MsgBase* base_;
   ::PROTOBUF_NAMESPACE_ID::uint64 travel_timestamp_;
+  ::PROTOBUF_NAMESPACE_ID::uint64 guarantee_timestamp_;
   int dsl_type_;
   mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
   friend struct ::TableStruct_milvus_2eproto;
@@ -7225,6 +7232,7 @@ class RetrieveRequest :
     kBaseFieldNumber = 1,
     kIdsFieldNumber = 5,
     kTravelTimestampFieldNumber = 7,
+    kGuaranteeTimestampFieldNumber = 8,
   };
   // repeated string partition_names = 4;
   int partition_names_size() const;
@@ -7303,6 +7311,11 @@ class RetrieveRequest :
   ::PROTOBUF_NAMESPACE_ID::uint64 travel_timestamp() const;
   void set_travel_timestamp(::PROTOBUF_NAMESPACE_ID::uint64 value);
 
+  // uint64 guarantee_timestamp = 8;
+  void clear_guarantee_timestamp();
+  ::PROTOBUF_NAMESPACE_ID::uint64 guarantee_timestamp() const;
+  void set_guarantee_timestamp(::PROTOBUF_NAMESPACE_ID::uint64 value);
+
   // @@protoc_insertion_point(class_scope:milvus.proto.milvus.RetrieveRequest)
  private:
   class _Internal;
@@ -7315,6 +7328,7 @@ class RetrieveRequest :
   ::milvus::proto::common::MsgBase* base_;
   ::milvus::proto::schema::IDs* ids_;
   ::PROTOBUF_NAMESPACE_ID::uint64 travel_timestamp_;
+  ::PROTOBUF_NAMESPACE_ID::uint64 guarantee_timestamp_;
   mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
   friend struct ::TableStruct_milvus_2eproto;
 };
@@ -16580,6 +16594,20 @@ inline void SearchRequest::set_travel_timestamp(::PROTOBUF_NAMESPACE_ID::uint64
   // @@protoc_insertion_point(field_set:milvus.proto.milvus.SearchRequest.travel_timestamp)
 }
 
+// uint64 guarantee_timestamp = 11;
+inline void SearchRequest::clear_guarantee_timestamp() {
+  guarantee_timestamp_ = PROTOBUF_ULONGLONG(0);
+}
+inline ::PROTOBUF_NAMESPACE_ID::uint64 SearchRequest::guarantee_timestamp() const {
+  // @@protoc_insertion_point(field_get:milvus.proto.milvus.SearchRequest.guarantee_timestamp)
+  return guarantee_timestamp_;
+}
+inline void SearchRequest::set_guarantee_timestamp(::PROTOBUF_NAMESPACE_ID::uint64 value) {
+  
+  guarantee_timestamp_ = value;
+  // @@protoc_insertion_point(field_set:milvus.proto.milvus.SearchRequest.guarantee_timestamp)
+}
+
 // -------------------------------------------------------------------
 
 // RetrieveRequest
@@ -16920,6 +16948,20 @@ inline void RetrieveRequest::set_travel_timestamp(::PROTOBUF_NAMESPACE_ID::uint6
   // @@protoc_insertion_point(field_set:milvus.proto.milvus.RetrieveRequest.travel_timestamp)
 }
 
+// uint64 guarantee_timestamp = 8;
+inline void RetrieveRequest::clear_guarantee_timestamp() {
+  guarantee_timestamp_ = PROTOBUF_ULONGLONG(0);
+}
+inline ::PROTOBUF_NAMESPACE_ID::uint64 RetrieveRequest::guarantee_timestamp() const {
+  // @@protoc_insertion_point(field_get:milvus.proto.milvus.RetrieveRequest.guarantee_timestamp)
+  return guarantee_timestamp_;
+}
+inline void RetrieveRequest::set_guarantee_timestamp(::PROTOBUF_NAMESPACE_ID::uint64 value) {
+  
+  guarantee_timestamp_ = value;
+  // @@protoc_insertion_point(field_set:milvus.proto.milvus.RetrieveRequest.guarantee_timestamp)
+}
+
 // -------------------------------------------------------------------
 
 // RetrieveResults
diff --git a/internal/msgstream/msg.go b/internal/msgstream/msg.go
index 7e31b28613..3e05f199e9 100644
--- a/internal/msgstream/msg.go
+++ b/internal/msgstream/msg.go
@@ -284,6 +284,14 @@ func (st *SearchMsg) SourceID() int64 {
 	return st.Base.SourceID
 }
 
+func (st *SearchMsg) GuaranteeTs() Timestamp {
+	return st.GetGuaranteeTimestamp()
+}
+
+func (st *SearchMsg) TravelTs() Timestamp {
+	return st.GetTravelTimestamp()
+}
+
 func (st *SearchMsg) Marshal(input TsMsg) (MarshalType, error) {
 	searchTask := input.(*SearchMsg)
 	searchRequest := &searchTask.SearchRequest
@@ -390,6 +398,14 @@ func (rm *RetrieveMsg) SourceID() int64 {
 	return rm.Base.SourceID
 }
 
+func (rm *RetrieveMsg) GuaranteeTs() Timestamp {
+	return rm.GetGuaranteeTimestamp()
+}
+
+func (rm *RetrieveMsg) TravelTs() Timestamp {
+	return rm.GetTravelTimestamp()
+}
+
 func (rm *RetrieveMsg) Marshal(input TsMsg) (MarshalType, error) {
 	retrieveTask := input.(*RetrieveMsg)
 	retrieveRequest := &retrieveTask.RetrieveRequest
diff --git a/internal/proto/internal.proto b/internal/proto/internal.proto
index af0ed29590..519c0e6ccd 100644
--- a/internal/proto/internal.proto
+++ b/internal/proto/internal.proto
@@ -134,6 +134,7 @@ message SearchRequest {
   bytes serialized_expr_plan = 9;
   repeated int64 output_fields_id = 10;
   uint64 travel_timestamp = 11;
+  uint64 guarantee_timestamp = 12;
 }
 
 message SearchResults {
@@ -163,6 +164,7 @@ message RetrieveRequest {
   schema.IDs ids = 6;
   repeated string output_fields = 7;
   uint64 travel_timestamp = 8;
+  uint64 guarantee_timestamp = 9;
 }
 
 message RetrieveResults {
diff --git a/internal/proto/internalpb/internal.pb.go b/internal/proto/internalpb/internal.pb.go
index 4a403e7bd0..d139b4c7ce 100644
--- a/internal/proto/internalpb/internal.pb.go
+++ b/internal/proto/internalpb/internal.pb.go
@@ -1048,6 +1048,7 @@ type SearchRequest struct {
 	SerializedExprPlan   []byte           `protobuf:"bytes,9,opt,name=serialized_expr_plan,json=serializedExprPlan,proto3" json:"serialized_expr_plan,omitempty"`
 	OutputFieldsId       []int64          `protobuf:"varint,10,rep,packed,name=output_fields_id,json=outputFieldsId,proto3" json:"output_fields_id,omitempty"`
 	TravelTimestamp      uint64           `protobuf:"varint,11,opt,name=travel_timestamp,json=travelTimestamp,proto3" json:"travel_timestamp,omitempty"`
+	GuaranteeTimestamp   uint64           `protobuf:"varint,12,opt,name=guarantee_timestamp,json=guaranteeTimestamp,proto3" json:"guarantee_timestamp,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
 	XXX_unrecognized     []byte           `json:"-"`
 	XXX_sizecache        int32            `json:"-"`
@@ -1155,6 +1156,13 @@ func (m *SearchRequest) GetTravelTimestamp() uint64 {
 	return 0
 }
 
+func (m *SearchRequest) GetGuaranteeTimestamp() uint64 {
+	if m != nil {
+		return m.GuaranteeTimestamp
+	}
+	return 0
+}
+
 type SearchResults struct {
 	Base            *commonpb.MsgBase `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
 	Status          *commonpb.Status  `protobuf:"bytes,2,opt,name=status,proto3" json:"status,omitempty"`
@@ -1284,6 +1292,7 @@ type RetrieveRequest struct {
 	Ids                  *schemapb.IDs     `protobuf:"bytes,6,opt,name=ids,proto3" json:"ids,omitempty"`
 	OutputFields         []string          `protobuf:"bytes,7,rep,name=output_fields,json=outputFields,proto3" json:"output_fields,omitempty"`
 	TravelTimestamp      uint64            `protobuf:"varint,8,opt,name=travel_timestamp,json=travelTimestamp,proto3" json:"travel_timestamp,omitempty"`
+	GuaranteeTimestamp   uint64            `protobuf:"varint,9,opt,name=guarantee_timestamp,json=guaranteeTimestamp,proto3" json:"guarantee_timestamp,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
 	XXX_unrecognized     []byte            `json:"-"`
 	XXX_sizecache        int32             `json:"-"`
@@ -1370,6 +1379,13 @@ func (m *RetrieveRequest) GetTravelTimestamp() uint64 {
 	return 0
 }
 
+func (m *RetrieveRequest) GetGuaranteeTimestamp() uint64 {
+	if m != nil {
+		return m.GuaranteeTimestamp
+	}
+	return 0
+}
+
 type RetrieveResults struct {
 	Base                      *commonpb.MsgBase     `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
 	Status                    *commonpb.Status      `protobuf:"bytes,2,opt,name=status,proto3" json:"status,omitempty"`
@@ -2228,126 +2244,127 @@ func init() {
 func init() { proto.RegisterFile("internal.proto", fileDescriptor_41f4a519b878ee3b) }
 
 var fileDescriptor_41f4a519b878ee3b = []byte{
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 }
diff --git a/internal/proto/milvus.proto b/internal/proto/milvus.proto
index d6a5f7b8e2..624fc3db61 100644
--- a/internal/proto/milvus.proto
+++ b/internal/proto/milvus.proto
@@ -332,6 +332,7 @@ message SearchRequest {
   repeated string output_fields = 8;
   repeated common.KeyValuePair search_params = 9; // must
   uint64 travel_timestamp = 10;
+  uint64 guarantee_timestamp = 11; // guarantee_timestamp
 }
 
 message RetrieveRequest {
@@ -342,6 +343,7 @@ message RetrieveRequest {
   schema.IDs ids = 5; // must
   repeated string output_fields = 6; // must
   uint64 travel_timestamp = 7;
+  uint64 guarantee_timestamp = 8; // guarantee_timestamp
 }
 
 message RetrieveResults {
diff --git a/internal/proto/milvuspb/milvus.pb.go b/internal/proto/milvuspb/milvus.pb.go
index e80e6e4c78..d4b2f5fcf5 100644
--- a/internal/proto/milvuspb/milvus.pb.go
+++ b/internal/proto/milvuspb/milvus.pb.go
@@ -2462,6 +2462,7 @@ type SearchRequest struct {
 	OutputFields         []string                 `protobuf:"bytes,8,rep,name=output_fields,json=outputFields,proto3" json:"output_fields,omitempty"`
 	SearchParams         []*commonpb.KeyValuePair `protobuf:"bytes,9,rep,name=search_params,json=searchParams,proto3" json:"search_params,omitempty"`
 	TravelTimestamp      uint64                   `protobuf:"varint,10,opt,name=travel_timestamp,json=travelTimestamp,proto3" json:"travel_timestamp,omitempty"`
+	GuaranteeTimestamp   uint64                   `protobuf:"varint,11,opt,name=guarantee_timestamp,json=guaranteeTimestamp,proto3" json:"guarantee_timestamp,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
 	XXX_unrecognized     []byte                   `json:"-"`
 	XXX_sizecache        int32                    `json:"-"`
@@ -2562,6 +2563,13 @@ func (m *SearchRequest) GetTravelTimestamp() uint64 {
 	return 0
 }
 
+func (m *SearchRequest) GetGuaranteeTimestamp() uint64 {
+	if m != nil {
+		return m.GuaranteeTimestamp
+	}
+	return 0
+}
+
 type RetrieveRequest struct {
 	Base                 *commonpb.MsgBase `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
 	DbName               string            `protobuf:"bytes,2,opt,name=db_name,json=dbName,proto3" json:"db_name,omitempty"`
@@ -2570,6 +2578,7 @@ type RetrieveRequest struct {
 	Ids                  *schemapb.IDs     `protobuf:"bytes,5,opt,name=ids,proto3" json:"ids,omitempty"`
 	OutputFields         []string          `protobuf:"bytes,6,rep,name=output_fields,json=outputFields,proto3" json:"output_fields,omitempty"`
 	TravelTimestamp      uint64            `protobuf:"varint,7,opt,name=travel_timestamp,json=travelTimestamp,proto3" json:"travel_timestamp,omitempty"`
+	GuaranteeTimestamp   uint64            `protobuf:"varint,8,opt,name=guarantee_timestamp,json=guaranteeTimestamp,proto3" json:"guarantee_timestamp,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
 	XXX_unrecognized     []byte            `json:"-"`
 	XXX_sizecache        int32             `json:"-"`
@@ -2649,6 +2658,13 @@ func (m *RetrieveRequest) GetTravelTimestamp() uint64 {
 	return 0
 }
 
+func (m *RetrieveRequest) GetGuaranteeTimestamp() uint64 {
+	if m != nil {
+		return m.GuaranteeTimestamp
+	}
+	return 0
+}
+
 type RetrieveResults struct {
 	Status               *commonpb.Status      `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
 	Ids                  *schemapb.IDs         `protobuf:"bytes,2,opt,name=ids,proto3" json:"ids,omitempty"`
@@ -3627,171 +3643,173 @@ func init() {
 func init() { proto.RegisterFile("milvus.proto", fileDescriptor_02345ba45cc0e303) }
 
 var fileDescriptor_02345ba45cc0e303 = []byte{
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+	0x63, 0xaa, 0x41, 0xec, 0x5d, 0xbd, 0x45, 0x70, 0x13, 0xaa, 0xc9, 0x07, 0x80, 0xf8, 0xa2, 0xd0,
+	0x7c, 0x29, 0xef, 0x04, 0xeb, 0xc3, 0xc4, 0x94, 0x27, 0xf0, 0xfb, 0x30, 0x15, 0x7f, 0x9a, 0x87,
+	0xc5, 0xd9, 0x42, 0xf8, 0x7e, 0xef, 0xa0, 0xc9, 0x9b, 0x50, 0x89, 0xbd, 0xb4, 0xc3, 0xe7, 0x85,
+	0x73, 0x8b, 0x5e, 0xe3, 0xd5, 0x97, 0x84, 0xa8, 0xd1, 0xd7, 0x70, 0x9c, 0xfb, 0xf8, 0x83, 0xa3,
+	0x14, 0xee, 0x85, 0xaf, 0x92, 0x0e, 0xe2, 0x5e, 0x85, 0x17, 0xf6, 0xbd, 0x1f, 0xc2, 0xaf, 0x09,
+	0xe7, 0x4f, 0x7b, 0x67, 0x74, 0xd0, 0x12, 0x7b, 0x80, 0xf7, 0xbf, 0x28, 0xc3, 0xab, 0x62, 0x0b,
+	0xa4, 0xbd, 0xa7, 0xab, 0xaf, 0x8d, 0x8c, 0x1f, 0x2a, 0xee, 0xfb, 0x08, 0x16, 0x52, 0x1e, 0xfd,
+	0xe0, 0x4b, 0xc2, 0xe9, 0x86, 0xbf, 0x5c, 0xaa, 0x5f, 0x3e, 0x1c, 0x51, 0xc8, 0x88, 0x09, 0xd3,
+	0x89, 0x00, 0xc3, 0x17, 0x46, 0x79, 0x6b, 0x13, 0xac, 0x7b, 0x71, 0x34, 0xe4, 0x70, 0x3d, 0xaf,
+	0x52, 0x8d, 0x3f, 0x7a, 0x49, 0x59, 0x4f, 0xfc, 0x34, 0xe6, 0x20, 0x83, 0xbe, 0x07, 0x95, 0xd8,
+	0xeb, 0x94, 0x14, 0x8f, 0x17, 0xbd, 0x60, 0x39, 0x68, 0xea, 0x07, 0x20, 0x45, 0x1f, 0x91, 0xe0,
+	0xe5, 0xb4, 0x58, 0xda, 0x37, 0xf1, 0x61, 0x42, 0x69, 0x70, 0xff, 0x3c, 0x24, 0x94, 0xf6, 0x5d,
+	0xab, 0x8f, 0x1e, 0x4a, 0x91, 0xf9, 0x87, 0x86, 0xd2, 0xa1, 0x97, 0x78, 0x82, 0x60, 0x5e, 0xfc,
+	0x06, 0x01, 0xaf, 0xa7, 0xf9, 0x66, 0xfa, 0x6b, 0x8b, 0xfa, 0xa5, 0x43, 0xd1, 0x84, 0x5a, 0xdc,
+	0x81, 0xa9, 0xf8, 0x2d, 0x7e, 0x8a, 0x16, 0x85, 0x8f, 0x13, 0xea, 0x17, 0x46, 0xc2, 0x0d, 0x17,
+	0xfb, 0x26, 0x94, 0x23, 0x37, 0xac, 0xf8, 0xd5, 0x21, 0x7e, 0x1c, 0x6d, 0xe0, 0x1f, 0xa4, 0xc9,
+	0x0e, 0x54, 0x62, 0xb7, 0x6a, 0x69, 0x3e, 0x2c, 0xb8, 0xec, 0xac, 0xaf, 0x8c, 0x82, 0x1a, 0x0a,
+	0xd0, 0x81, 0x4a, 0xec, 0x8e, 0x23, 0x65, 0x25, 0xd1, 0x95, 0x4e, 0xca, 0x4a, 0xc2, 0x2b, 0x13,
+	0x79, 0x02, 0x7f, 0x37, 0x72, 0x9d, 0x12, 0xbb, 0xb2, 0xc2, 0x6f, 0x0c, 0x9d, 0x47, 0x74, 0x63,
+	0x57, 0x5f, 0x3f, 0x0c, 0x49, 0xc8, 0xc2, 0x3b, 0x50, 0x0a, 0xaf, 0x52, 0xf0, 0xb9, 0xd4, 0xb4,
+	0x70, 0x18, 0x4b, 0x35, 0x20, 0xcf, 0xaf, 0x35, 0xb0, 0x9c, 0x72, 0x3f, 0x19, 0xb9, 0xf3, 0xa8,
+	0xbf, 0x2c, 0xc4, 0x89, 0x77, 0xfc, 0xe5, 0x09, 0xac, 0x40, 0x9e, 0x37, 0x49, 0x52, 0x26, 0x8d,
+	0x35, 0x7f, 0xeb, 0xc3, 0x71, 0x78, 0x67, 0x65, 0x02, 0x7f, 0x0b, 0x8a, 0x41, 0x97, 0x0b, 0xbf,
+	0x92, 0x12, 0xf6, 0xb1, 0x16, 0x63, 0xfd, 0x20, 0xac, 0x60, 0xe6, 0x2d, 0xc8, 0xb1, 0x36, 0x05,
+	0x5e, 0x1a, 0xd6, 0xc2, 0x18, 0xc6, 0x6b, 0xac, 0xcb, 0x21, 0x4f, 0xe0, 0x6f, 0x40, 0x8e, 0x95,
+	0xc2, 0x29, 0x33, 0x46, 0xfb, 0x10, 0xf5, 0xa1, 0x28, 0x01, 0x8b, 0x3f, 0x40, 0x50, 0x4b, 0x3b,
+	0xe7, 0xe1, 0xd4, 0x7d, 0x73, 0xd8, 0x61, 0xb5, 0x7e, 0xe5, 0x90, 0x54, 0xa1, 0x70, 0x8f, 0x61,
+	0x46, 0x70, 0xba, 0xc0, 0x6b, 0x69, 0xf3, 0xa5, 0x1c, 0x8c, 0xea, 0xaf, 0x8f, 0x4e, 0x10, 0xae,
+	0xbd, 0x05, 0x39, 0x76, 0x2a, 0x48, 0x51, 0x6c, 0xf4, 0x90, 0x91, 0x62, 0xaa, 0xd8, 0xa1, 0x42,
+	0x9e, 0xc0, 0x04, 0xa4, 0xe8, 0x11, 0x21, 0x65, 0x4b, 0x14, 0x9c, 0x2e, 0xea, 0xe7, 0x47, 0xc0,
+	0x0c, 0x96, 0x59, 0x77, 0x41, 0xda, 0xb2, 0xad, 0x47, 0xfd, 0xa0, 0x28, 0xff, 0xdf, 0x2c, 0x7b,
+	0xed, 0xca, 0xb7, 0x2f, 0xb5, 0x75, 0xa7, 0xe3, 0x6e, 0x7b, 0x71, 0xbf, 0xc6, 0x71, 0x5f, 0xd3,
+	0x2d, 0xff, 0x6b, 0x4d, 0x37, 0x1d, 0x62, 0x9b, 0xaa, 0xb1, 0xc6, 0xe6, 0xf2, 0xa1, 0xbd, 0xed,
+	0xed, 0x3c, 0xfb, 0xbf, 0xf4, 0xdf, 0x00, 0x00, 0x00, 0xff, 0xff, 0x10, 0x05, 0x53, 0xed, 0x7c,
+	0x34, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/internal/proxy/task.go b/internal/proxy/task.go
index d618939d7e..3ccfa739ef 100644
--- a/internal/proxy/task.go
+++ b/internal/proxy/task.go
@@ -1317,7 +1317,12 @@ func (st *SearchTask) PreExecute(ctx context.Context) error {
 	if travelTimestamp == 0 {
 		travelTimestamp = st.BeginTs()
 	}
+	guaranteeTimestamp := st.query.GuaranteeTimestamp
+	if guaranteeTimestamp == 0 {
+		guaranteeTimestamp = st.BeginTs()
+	}
 	st.SearchRequest.TravelTimestamp = travelTimestamp
+	st.SearchRequest.GuaranteeTimestamp = guaranteeTimestamp
 
 	st.SearchRequest.ResultChannelID = Params.SearchResultChannelNames[0]
 	st.SearchRequest.DbID = 0 // todo
@@ -2090,7 +2095,12 @@ func (rt *RetrieveTask) PreExecute(ctx context.Context) error {
 	if travelTimestamp == 0 {
 		travelTimestamp = rt.BeginTs()
 	}
+	guaranteeTimestamp := rt.retrieve.GuaranteeTimestamp
+	if guaranteeTimestamp == 0 {
+		guaranteeTimestamp = rt.BeginTs()
+	}
 	rt.RetrieveRequest.TravelTimestamp = travelTimestamp
+	rt.RetrieveRequest.GuaranteeTimestamp = guaranteeTimestamp
 
 	rt.ResultChannelID = Params.RetrieveResultChannelNames[0]
 	rt.DbID = 0 // todo(yukun)
diff --git a/internal/querynode/query_collection.go b/internal/querynode/query_collection.go
index a6627c84aa..4a17a48d32 100644
--- a/internal/querynode/query_collection.go
+++ b/internal/querynode/query_collection.go
@@ -36,6 +36,12 @@ import (
 	"github.com/milvus-io/milvus/internal/util/typeutil"
 )
 
+type queryMsg interface {
+	msgstream.TsMsg
+	GuaranteeTs() Timestamp
+	TravelTs() Timestamp
+}
+
 type queryCollection struct {
 	releaseCtx context.Context
 	cancel     context.CancelFunc
@@ -45,7 +51,7 @@ type queryCollection struct {
 	streaming    *streaming
 
 	unsolvedMsgMu sync.Mutex // guards unsolvedMsg
-	unsolvedMsg   []msgstream.TsMsg
+	unsolvedMsg   []queryMsg
 
 	tSafeWatchers     map[Channel]*tSafeWatcher
 	watcherSelectCase []reflect.SelectCase
@@ -66,7 +72,7 @@ func newQueryCollection(releaseCtx context.Context,
 	streaming *streaming,
 	factory msgstream.Factory) *queryCollection {
 
-	unsolvedMsg := make([]msgstream.TsMsg, 0)
+	unsolvedMsg := make([]queryMsg, 0)
 
 	queryStream, _ := factory.NewQueryMsgStream(releaseCtx)
 	queryResultStream, _ := factory.NewQueryMsgStream(releaseCtx)
@@ -130,13 +136,13 @@ func (q *queryCollection) register() {
 	}
 }
 
-func (q *queryCollection) addToUnsolvedMsg(msg msgstream.TsMsg) {
+func (q *queryCollection) addToUnsolvedMsg(msg queryMsg) {
 	q.unsolvedMsgMu.Lock()
 	defer q.unsolvedMsgMu.Unlock()
 	q.unsolvedMsg = append(q.unsolvedMsg, msg)
 }
 
-func (q *queryCollection) popAllUnsolvedMsg() []msgstream.TsMsg {
+func (q *queryCollection) popAllUnsolvedMsg() []queryMsg {
 	q.unsolvedMsgMu.Lock()
 	defer q.unsolvedMsgMu.Unlock()
 	tmp := q.unsolvedMsg
@@ -250,7 +256,7 @@ func (q *queryCollection) loadBalance(msg *msgstream.LoadBalanceSegmentsMsg) {
 	//	zap.Int("num of segment", len(msg.Infos)))
 }
 
-func (q *queryCollection) receiveQueryMsg(msg msgstream.TsMsg) {
+func (q *queryCollection) receiveQueryMsg(msg queryMsg) {
 	msgType := msg.Type()
 	var collectionID UniqueID
 	var msgTypeStr string
@@ -304,7 +310,8 @@ func (q *queryCollection) receiveQueryMsg(msg msgstream.TsMsg) {
 		}
 		return
 	}
-	if msg.BeginTs() >= collection.getReleaseTime() {
+	guaranteeTs := msg.GuaranteeTs()
+	if guaranteeTs >= collection.getReleaseTime() {
 		err = fmt.Errorf("retrieve failed, collection has been released, msgID = %d, collectionID = %d", msg.ID(), collectionID)
 		log.Error(err.Error())
 		err = q.publishFailedQueryResult(msg, err.Error())
@@ -321,23 +328,23 @@ func (q *queryCollection) receiveQueryMsg(msg msgstream.TsMsg) {
 	}
 
 	serviceTime := q.getServiceableTime()
-	if msg.BeginTs() > serviceTime {
-		bt, _ := tsoutil.ParseTS(msg.BeginTs())
+	if guaranteeTs > serviceTime {
+		gt, _ := tsoutil.ParseTS(guaranteeTs)
 		st, _ := tsoutil.ParseTS(serviceTime)
 		log.Debug("query node::receiveQueryMsg: add to unsolvedMsg",
 			zap.Any("collectionID", q.collectionID),
-			zap.Any("sm.BeginTs", bt),
+			zap.Any("sm.GuaranteeTimestamp", gt),
 			zap.Any("serviceTime", st),
-			zap.Any("delta seconds", (msg.BeginTs()-serviceTime)/(1000*1000*1000)),
+			zap.Any("delta seconds", (guaranteeTs-serviceTime)/(1000*1000*1000)),
 			zap.Any("msgID", msg.ID()),
 			zap.String("msgType", msgTypeStr),
 		)
 		q.addToUnsolvedMsg(msg)
 		sp.LogFields(
 			oplog.String("send to unsolved buffer", "send to unsolved buffer"),
-			oplog.Object("begin ts", bt),
+			oplog.Object("guarantee ts", gt),
 			oplog.Object("serviceTime", st),
-			oplog.Float64("delta seconds", float64(msg.BeginTs()-serviceTime)/(1000.0*1000.0*1000.0)),
+			oplog.Float64("delta seconds", float64(guaranteeTs-serviceTime)/(1000.0*1000.0*1000.0)),
 		)
 		sp.Finish()
 		return
@@ -401,29 +408,30 @@ func (q *queryCollection) doUnsolvedQueryMsg() {
 			q.setServiceableTime(serviceTime)
 			//log.Debug("query node::doUnsolvedMsg: setServiceableTime", zap.Any("serviceTime", st))
 
-			unSolvedMsg := make([]msgstream.TsMsg, 0)
+			unSolvedMsg := make([]queryMsg, 0)
 			tempMsg := q.popAllUnsolvedMsg()
 
 			for _, m := range tempMsg {
-				bt, _ := tsoutil.ParseTS(m.EndTs())
+				guaranteeTs := m.GuaranteeTs()
+				gt, _ := tsoutil.ParseTS(guaranteeTs)
 				st, _ = tsoutil.ParseTS(serviceTime)
 				log.Debug("get query message from unsolvedMsg",
 					zap.Int64("collectionID", q.collectionID),
 					zap.Int64("msgID", m.ID()),
-					zap.Any("reqTime_p", bt),
+					zap.Any("reqTime_p", gt),
 					zap.Any("serviceTime_p", st),
-					zap.Any("reqTime_l", m.EndTs()),
+					zap.Any("guaranteeTime_l", guaranteeTs),
 					zap.Any("serviceTime_l", serviceTime),
 				)
-				if m.EndTs() <= serviceTime {
+				if guaranteeTs <= serviceTime {
 					unSolvedMsg = append(unSolvedMsg, m)
 					continue
 				}
 				log.Debug("query node::doUnsolvedMsg: add to unsolvedMsg",
 					zap.Any("collectionID", q.collectionID),
-					zap.Any("sm.BeginTs", bt),
+					zap.Any("sm.BeginTs", gt),
 					zap.Any("serviceTime", st),
-					zap.Any("delta seconds", (m.BeginTs()-serviceTime)/(1000*1000*1000)),
+					zap.Any("delta seconds", (guaranteeTs-serviceTime)/(1000*1000*1000)),
 					zap.Any("msgID", m.ID()),
 				)
 				q.addToUnsolvedMsg(m)
@@ -699,12 +707,13 @@ func translateHits(schema *typeutil.SchemaHelper, fieldIDs []int64, rawHits [][]
 
 // TODO:: cache map[dsl]plan
 // TODO: reBatched search requests
-func (q *queryCollection) search(msg msgstream.TsMsg) error {
+func (q *queryCollection) search(msg queryMsg) error {
 	searchMsg := msg.(*msgstream.SearchMsg)
 	sp, ctx := trace.StartSpanFromContext(searchMsg.TraceCtx())
 	defer sp.Finish()
 	searchMsg.SetTraceCtx(ctx)
 	searchTimestamp := searchMsg.BeginTs()
+	travelTimestamp := searchMsg.TravelTimestamp
 
 	collectionID := searchMsg.CollectionID
 	collection, err := q.streaming.replica.getCollectionByID(collectionID)
@@ -763,7 +772,7 @@ func (q *queryCollection) search(msg msgstream.TsMsg) error {
 	sealedSegmentSearched := make([]UniqueID, 0)
 
 	// historical search
-	hisSearchResults, hisSegmentResults, err1 := q.historical.search(searchRequests, collectionID, searchMsg.PartitionIDs, plan, searchTimestamp)
+	hisSearchResults, hisSegmentResults, err1 := q.historical.search(searchRequests, collectionID, searchMsg.PartitionIDs, plan, travelTimestamp)
 	if err1 != nil {
 		log.Error(err1.Error())
 		return err1
@@ -780,7 +789,7 @@ func (q *queryCollection) search(msg msgstream.TsMsg) error {
 	for _, channel := range collection.getVChannels() {
 		var strSearchResults []*SearchResult
 		var strSegmentResults []*Segment
-		strSearchResults, strSegmentResults, err2 = q.streaming.search(searchRequests, collectionID, searchMsg.PartitionIDs, channel, plan, searchTimestamp)
+		strSearchResults, strSegmentResults, err2 = q.streaming.search(searchRequests, collectionID, searchMsg.PartitionIDs, channel, plan, travelTimestamp)
 		if err2 != nil {
 			log.Error(err2.Error())
 			return err2
@@ -986,7 +995,7 @@ func (q *queryCollection) search(msg msgstream.TsMsg) error {
 	return nil
 }
 
-func (q *queryCollection) retrieve(msg msgstream.TsMsg) error {
+func (q *queryCollection) retrieve(msg queryMsg) error {
 	// TODO(yukun)
 	// step 1: get retrieve object and defer destruction
 	// step 2: for each segment, call retrieve to get ids proto buffer
diff --git a/internal/querynode/retrieve_collection.go b/internal/querynode/retrieve_collection.go
deleted file mode 100644
index ab7a64aaad..0000000000
--- a/internal/querynode/retrieve_collection.go
+++ /dev/null
@@ -1,502 +0,0 @@
-// Copyright (C) 2019-2020 Zilliz. All rights reserved.
-//
-// Licensed 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 querynode
-
-import (
-	"context"
-	"errors"
-	"math"
-	"reflect"
-	"sync"
-
-	oplog "github.com/opentracing/opentracing-go/log"
-	"go.uber.org/zap"
-
-	"github.com/milvus-io/milvus/internal/log"
-	"github.com/milvus-io/milvus/internal/msgstream"
-	"github.com/milvus-io/milvus/internal/proto/commonpb"
-	"github.com/milvus-io/milvus/internal/proto/internalpb"
-	"github.com/milvus-io/milvus/internal/proto/segcorepb"
-	"github.com/milvus-io/milvus/internal/util/trace"
-	"github.com/milvus-io/milvus/internal/util/tsoutil"
-)
-
-type retrieveCollection struct {
-	releaseCtx context.Context
-	cancel     context.CancelFunc
-
-	collectionID UniqueID
-	historical   *historical
-	streaming    *streaming
-
-	msgBuffer     chan *msgstream.RetrieveMsg
-	unsolvedMsgMu sync.Mutex
-	unsolvedMsg   []*msgstream.RetrieveMsg
-
-	tSafeWatchers     map[Channel]*tSafeWatcher
-	watcherSelectCase []reflect.SelectCase
-
-	serviceableTimeMutex sync.Mutex
-	serviceableTime      Timestamp
-
-	retrieveResultMsgStream msgstream.MsgStream
-}
-
-func newRetrieveCollection(releaseCtx context.Context,
-	cancel context.CancelFunc,
-	collectionID UniqueID,
-	historical *historical,
-	streaming *streaming,
-	retrieveResultStream msgstream.MsgStream) *retrieveCollection {
-	receiveBufSize := Params.RetrieveReceiveBufSize
-	msgBuffer := make(chan *msgstream.RetrieveMsg, receiveBufSize)
-	unsolvedMsg := make([]*msgstream.RetrieveMsg, 0)
-
-	rc := &retrieveCollection{
-		releaseCtx: releaseCtx,
-		cancel:     cancel,
-
-		collectionID: collectionID,
-		historical:   historical,
-		streaming:    streaming,
-
-		tSafeWatchers: make(map[Channel]*tSafeWatcher),
-
-		msgBuffer:   msgBuffer,
-		unsolvedMsg: unsolvedMsg,
-
-		retrieveResultMsgStream: retrieveResultStream,
-	}
-
-	rc.register()
-	return rc
-}
-
-func (rc *retrieveCollection) getServiceableTime() Timestamp {
-	rc.serviceableTimeMutex.Lock()
-	defer rc.serviceableTimeMutex.Unlock()
-	return rc.serviceableTime
-}
-
-func (rc *retrieveCollection) setServiceableTime(t Timestamp) {
-	rc.serviceableTimeMutex.Lock()
-	defer rc.serviceableTimeMutex.Unlock()
-
-	if t < rc.serviceableTime {
-		return
-	}
-
-	gracefulTimeInMilliSecond := Params.GracefulTime
-	if gracefulTimeInMilliSecond > 0 {
-		gracefulTime := tsoutil.ComposeTS(gracefulTimeInMilliSecond, 0)
-		rc.serviceableTime = t + gracefulTime
-	} else {
-		rc.serviceableTime = t
-	}
-}
-
-func (rc *retrieveCollection) waitNewTSafe() Timestamp {
-	// block until any vChannel updating tSafe
-	_, _, recvOK := reflect.Select(rc.watcherSelectCase)
-	if !recvOK {
-		log.Error("tSafe has been closed")
-		return invalidTimestamp
-	}
-	t := Timestamp(math.MaxInt64)
-	for channel := range rc.tSafeWatchers {
-		ts := rc.streaming.tSafeReplica.getTSafe(channel)
-		if ts <= t {
-			t = ts
-		}
-	}
-	return t
-}
-
-func (rc *retrieveCollection) start() {
-	go rc.receiveRetrieveMsg()
-	go rc.doUnsolvedMsgRetrieve()
-}
-
-func (rc *retrieveCollection) register() {
-	// register tSafe watcher and init watcher select case
-	collection, err := rc.streaming.replica.getCollectionByID(rc.collectionID)
-	if err != nil {
-		log.Error(err.Error())
-		return
-	}
-
-	rc.watcherSelectCase = make([]reflect.SelectCase, 0)
-	for _, channel := range collection.getVChannels() {
-		rc.streaming.tSafeReplica.addTSafe(channel)
-		rc.tSafeWatchers[channel] = newTSafeWatcher()
-		rc.streaming.tSafeReplica.registerTSafeWatcher(channel, rc.tSafeWatchers[channel])
-		rc.watcherSelectCase = append(rc.watcherSelectCase, reflect.SelectCase{
-			Dir:  reflect.SelectRecv,
-			Chan: reflect.ValueOf(rc.tSafeWatchers[channel].watcherChan()),
-		})
-	}
-}
-
-func (rc *retrieveCollection) addToUnsolvedMsg(msg *msgstream.RetrieveMsg) {
-	rc.unsolvedMsgMu.Lock()
-	defer rc.unsolvedMsgMu.Unlock()
-	rc.unsolvedMsg = append(rc.unsolvedMsg, msg)
-}
-
-func (rc *retrieveCollection) receiveRetrieveMsg() {
-	for {
-		select {
-		case <-rc.releaseCtx.Done():
-			log.Debug("stop retrieveCollection's receiveRetrieveMsg", zap.Int64("collectionID", rc.collectionID))
-			return
-		case rm := <-rc.msgBuffer:
-			log.Info("RetrieveCollection get retrieve message from msgBuffer",
-				zap.Int64("collectionID", rm.CollectionID),
-				zap.Int64("requestID", rm.ID()),
-				zap.Any("requestType", "retrieve"),
-			)
-
-			sp, ctx := trace.StartSpanFromContext(rm.TraceCtx())
-			rm.SetTraceCtx(ctx)
-			serviceTime := rc.getServiceableTime()
-			if rm.BeginTs() > serviceTime {
-				bt, _ := tsoutil.ParseTS(rm.BeginTs())
-				st, _ := tsoutil.ParseTS(serviceTime)
-				log.Debug("Timestamp of retrieve request great than serviceTime, add to unsolvedMsgs",
-					zap.Any("sm.BeginTs", bt),
-					zap.Any("serviceTime", st),
-					zap.Any("delta seconds", (rm.BeginTs()-serviceTime)/(1000*1000*1000)),
-					zap.Any("collectionID", rc.collectionID),
-					zap.Int64("collectionID", rm.CollectionID),
-					zap.Int64("requestID", rm.ID()),
-					zap.Any("requestType", "retrieve"),
-				)
-				rc.addToUnsolvedMsg(rm)
-				sp.LogFields(
-					oplog.String("send to unsolved retrieve buffer", "send to unsolved buffer"),
-					oplog.Object("begin ts", bt),
-					oplog.Object("serviceTime", st),
-					oplog.Float64("delta seconds", float64(rm.BeginTs()-serviceTime)/(1000.0*1000.0*1000.0)),
-				)
-				sp.Finish()
-				continue
-			}
-
-			log.Info("Doing retrieve in receiveRetrieveMsg...",
-				zap.Int64("collectionID", rm.CollectionID),
-				zap.Int64("requestID", rm.ID()),
-				zap.Any("requestType", "retrieve"),
-			)
-			err := rc.retrieve(rm)
-
-			if err != nil {
-				log.Error(err.Error(),
-					zap.Int64("requestID", rm.ID()),
-					zap.Any("requestType", "retrieve"),
-				)
-
-				log.Debug("Failed to execute retrieve, prepare to publish failed retrieve result",
-					zap.Int64("collectionID", rm.CollectionID),
-					zap.Int64("requestID", rm.ID()),
-					zap.Any("requestType", "retrieve"),
-				)
-
-				err2 := rc.publishFailedRetrieveResult(rm, err.Error())
-				if err2 != nil {
-					log.Error("Failed to publish FailedRetrieveResult",
-						zap.Error(err2),
-						zap.Int64("requestID", rm.ID()),
-						zap.Any("requestType", "retrieve"),
-					)
-				}
-			}
-
-			log.Debug("Do retrieve done in retrieveRetrieveMsg",
-				zap.Int64("msgID", rm.ID()),
-				zap.Int64("collectionID", rm.CollectionID),
-				zap.Int64("requestID", rm.ID()),
-				zap.Any("requestType", "retrieve"),
-			)
-			sp.Finish()
-		}
-	}
-}
-
-func (rc *retrieveCollection) doUnsolvedMsgRetrieve() {
-	for {
-		select {
-		case <-rc.releaseCtx.Done():
-			log.Debug("stop retrieveCollection's doUnsolvedMsgRetrieve", zap.Int64("collectionID", rc.collectionID))
-			return
-		default:
-			serviceTime := rc.waitNewTSafe()
-			rc.setServiceableTime(serviceTime)
-			log.Debug("Update serviceTime",
-				zap.Any("serviceTime", serviceTime),
-				zap.Uint64("tSafe", serviceTime),
-				zap.Int64("collectionID", rc.collectionID),
-			)
-
-			retrieveMsg := make([]*msgstream.RetrieveMsg, 0)
-			rc.unsolvedMsgMu.Lock()
-			tmpMsg := rc.unsolvedMsg
-			rc.unsolvedMsg = rc.unsolvedMsg[:0]
-			rc.unsolvedMsgMu.Unlock()
-
-			for _, rm := range tmpMsg {
-				log.Debug("Get retrieve message from unsolvedMsg",
-					zap.Int64("collectionID", rm.CollectionID),
-					zap.Int64("requestID", rm.ID()),
-					zap.Any("requestType", "retrieve"),
-				)
-
-				if rm.EndTs() <= serviceTime {
-					retrieveMsg = append(retrieveMsg, rm)
-					continue
-				}
-				rc.addToUnsolvedMsg(rm)
-			}
-
-			if len(retrieveMsg) <= 0 {
-				continue
-			}
-
-			for _, rm := range retrieveMsg {
-				sp, ctx := trace.StartSpanFromContext(rm.TraceCtx())
-				rm.SetTraceCtx(ctx)
-
-				log.Debug("Doing retrieve in doUnsolvedMsgRetrieve...",
-					zap.Int64("collectionID", rm.CollectionID),
-					zap.Int64("requestID", rm.ID()),
-					zap.Any("requestType", "retrieve"),
-				)
-				err := rc.retrieve(rm)
-
-				if err != nil {
-					log.Error(err.Error(),
-						zap.Int64("requestID", rm.ID()),
-						zap.Any("requestType", "retrieve"),
-					)
-
-					log.Debug("Failed to do retrieve in doUnsolvedMsgRetrieve, prepare to publish failed retrieve result",
-						zap.Int64("collectionID", rm.CollectionID),
-						zap.Int64("requestID", rm.ID()),
-						zap.Any("requestType", "retrieve"),
-					)
-
-					err2 := rc.publishFailedRetrieveResult(rm, err.Error())
-					if err2 != nil {
-						log.Error("Failed to publish FailedRetrieveResult",
-							zap.Error(err2),
-							zap.Int64("requestID", rm.ID()),
-							zap.Any("requestType", "retrieve"),
-						)
-					}
-				}
-
-				sp.Finish()
-				log.Debug("Do retrieve done in doUnsolvedMsgRetrieve",
-					zap.Int64("collectionID", rm.CollectionID),
-					zap.Int64("requestID", rm.ID()),
-					zap.Any("requestType", "retrieve"),
-				)
-			}
-			log.Debug("doUnsolvedMsgRetrieve, do retrieve done", zap.Int("num of retrieveMsg", len(retrieveMsg)))
-		}
-	}
-}
-
-func (rc *retrieveCollection) retrieve(retrieveMsg *msgstream.RetrieveMsg) error {
-	// TODO(yukun)
-	// step 1: get retrieve object and defer destruction
-	// step 2: for each segment, call retrieve to get ids proto buffer
-	// step 3: merge all proto in go
-	// step 4: publish results
-	// retrieveProtoBlob, err := proto.Marshal(&retrieveMsg.RetrieveRequest)
-	sp, ctx := trace.StartSpanFromContext(retrieveMsg.TraceCtx())
-	defer sp.Finish()
-	retrieveMsg.SetTraceCtx(ctx)
-	timestamp := retrieveMsg.RetrieveRequest.TravelTimestamp
-
-	collectionID := retrieveMsg.CollectionID
-	collection, err := rc.streaming.replica.getCollectionByID(collectionID)
-	if err != nil {
-		return err
-	}
-
-	req := &segcorepb.RetrieveRequest{
-		Ids:          retrieveMsg.Ids,
-		OutputFields: retrieveMsg.OutputFields,
-	}
-
-	plan, err := createRetrievePlan(collection, req, timestamp)
-	if err != nil {
-		return err
-	}
-	defer plan.delete()
-
-	var partitionIDsInHistorical []UniqueID
-	var partitionIDsInStreaming []UniqueID
-	partitionIDsInQuery := retrieveMsg.PartitionIDs
-	if len(partitionIDsInQuery) == 0 {
-		partitionIDsInHistoricalCol, err1 := rc.historical.replica.getPartitionIDs(collectionID)
-		partitionIDsInStreamingCol, err2 := rc.streaming.replica.getPartitionIDs(collectionID)
-		if err1 != nil && err2 != nil {
-			return err2
-		}
-		if len(partitionIDsInHistoricalCol) == 0 {
-			return errors.New("none of this collection's partition has been loaded")
-		}
-		partitionIDsInHistorical = partitionIDsInHistoricalCol
-		partitionIDsInStreaming = partitionIDsInStreamingCol
-	} else {
-		for _, id := range partitionIDsInQuery {
-			_, err1 := rc.historical.replica.getPartitionByID(id)
-			if err1 == nil {
-				partitionIDsInHistorical = append(partitionIDsInHistorical, id)
-			}
-			_, err2 := rc.streaming.replica.getPartitionByID(id)
-			if err2 == nil {
-				partitionIDsInStreaming = append(partitionIDsInStreaming, id)
-			}
-			if err1 != nil && err2 != nil {
-				return err2
-			}
-		}
-	}
-
-	sealedSegmentRetrieved := make([]UniqueID, 0)
-	var mergeList []*segcorepb.RetrieveResults
-	for _, partitionID := range partitionIDsInHistorical {
-		segmentIDs, err := rc.historical.replica.getSegmentIDs(partitionID)
-		if err != nil {
-			return err
-		}
-		for _, segmentID := range segmentIDs {
-			segment, err := rc.historical.replica.getSegmentByID(segmentID)
-			if err != nil {
-				return err
-			}
-			result, err := segment.segmentGetEntityByIds(plan)
-			if err != nil {
-				return err
-			}
-			mergeList = append(mergeList, result)
-			sealedSegmentRetrieved = append(sealedSegmentRetrieved, segmentID)
-		}
-	}
-
-	for _, partitionID := range partitionIDsInStreaming {
-		segmentIDs, err := rc.streaming.replica.getSegmentIDs(partitionID)
-		if err != nil {
-			return err
-		}
-		for _, segmentID := range segmentIDs {
-			segment, err := rc.streaming.replica.getSegmentByID(segmentID)
-			if err != nil {
-				return err
-			}
-			result, err := segment.segmentGetEntityByIds(plan)
-			if err != nil {
-				return err
-			}
-			mergeList = append(mergeList, result)
-		}
-	}
-
-	result, err := mergeRetrieveResults(mergeList)
-	if err != nil {
-		return err
-	}
-
-	resultChannelInt := 0
-	retrieveResultMsg := &msgstream.RetrieveResultMsg{
-		BaseMsg: msgstream.BaseMsg{Ctx: retrieveMsg.Ctx, HashValues: []uint32{uint32(resultChannelInt)}},
-		RetrieveResults: internalpb.RetrieveResults{
-			Base: &commonpb.MsgBase{
-				MsgType:  commonpb.MsgType_RetrieveResult,
-				MsgID:    retrieveMsg.Base.MsgID,
-				SourceID: retrieveMsg.Base.SourceID,
-			},
-			Status:                    &commonpb.Status{ErrorCode: commonpb.ErrorCode_Success},
-			Ids:                       result.Ids,
-			FieldsData:                result.FieldsData,
-			ResultChannelID:           retrieveMsg.ResultChannelID,
-			SealedSegmentIDsRetrieved: sealedSegmentRetrieved,
-			ChannelIDsRetrieved:       collection.getVChannels(),
-			//TODO(yukun):: get global sealed segment from etcd
-			GlobalSealedSegmentIDs: sealedSegmentRetrieved,
-		},
-	}
-	log.Debug("QueryNode RetrieveResultMsg",
-		zap.Any("vChannels", collection.getVChannels()),
-		zap.Any("collectionID", collection.ID()),
-		zap.Any("sealedSegmentRetrieved", sealedSegmentRetrieved),
-	)
-	err3 := rc.publishRetrieveResult(retrieveResultMsg, retrieveMsg.CollectionID)
-	if err3 != nil {
-		return err3
-	}
-	return nil
-}
-
-func (rc *retrieveCollection) publishRetrieveResult(msg msgstream.TsMsg, collectionID UniqueID) error {
-	log.Debug("publishing retrieve result...",
-		zap.Int64("msgID", msg.ID()),
-		zap.Int64("collectionID", collectionID))
-	span, ctx := trace.StartSpanFromContext(msg.TraceCtx())
-	defer span.Finish()
-	msg.SetTraceCtx(ctx)
-	msgPack := msgstream.MsgPack{}
-	msgPack.Msgs = append(msgPack.Msgs, msg)
-	err := rc.retrieveResultMsgStream.Produce(&msgPack)
-	if err != nil {
-		log.Error(err.Error())
-	} else {
-		log.Debug("publish retrieve result done",
-			zap.Int64("msgID", msg.ID()),
-			zap.Int64("collectionID", collectionID))
-	}
-	return err
-}
-
-func (rc *retrieveCollection) publishFailedRetrieveResult(retrieveMsg *msgstream.RetrieveMsg, errMsg string) error {
-	span, ctx := trace.StartSpanFromContext(retrieveMsg.TraceCtx())
-	defer span.Finish()
-	retrieveMsg.SetTraceCtx(ctx)
-	msgPack := msgstream.MsgPack{}
-
-	resultChannelInt := 0
-	retrieveResultMsg := &msgstream.RetrieveResultMsg{
-		BaseMsg: msgstream.BaseMsg{HashValues: []uint32{uint32(resultChannelInt)}},
-		RetrieveResults: internalpb.RetrieveResults{
-			Base: &commonpb.MsgBase{
-				MsgType:   commonpb.MsgType_RetrieveResult,
-				MsgID:     retrieveMsg.Base.MsgID,
-				Timestamp: retrieveMsg.Base.Timestamp,
-				SourceID:  retrieveMsg.Base.SourceID,
-			},
-			Status:          &commonpb.Status{ErrorCode: commonpb.ErrorCode_UnexpectedError, Reason: errMsg},
-			ResultChannelID: retrieveMsg.ResultChannelID,
-			Ids:             nil,
-			FieldsData:      nil,
-		},
-	}
-
-	msgPack.Msgs = append(msgPack.Msgs, retrieveResultMsg)
-	err := rc.retrieveResultMsgStream.Produce(&msgPack)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
diff --git a/internal/querynode/retrieve_collection_test.go b/internal/querynode/retrieve_collection_test.go
deleted file mode 100644
index 34c6e7b7b9..0000000000
--- a/internal/querynode/retrieve_collection_test.go
+++ /dev/null
@@ -1,54 +0,0 @@
-package querynode
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-
-	"github.com/milvus-io/milvus/internal/proto/schemapb"
-	"github.com/milvus-io/milvus/internal/proto/segcorepb"
-)
-
-func TestRetrieve_Merge(t *testing.T) {
-
-	col1 := &schemapb.FieldData{
-		Field: &schemapb.FieldData_Scalars{
-			Scalars: &schemapb.ScalarField{
-				Data: &schemapb.ScalarField_IntData{
-					IntData: &schemapb.IntArray{
-						Data: []int32{1, 2, 3},
-					},
-				},
-			},
-		},
-	}
-
-	col2 := &schemapb.FieldData{
-		Field: &schemapb.FieldData_Vectors{
-			Vectors: &schemapb.VectorField{
-				Data: &schemapb.VectorField_FloatVector{
-					FloatVector: &schemapb.FloatArray{
-						Data: []float32{1, 1, 2, 2, 3, 3},
-					},
-				},
-			},
-		},
-	}
-
-	subRes := &segcorepb.RetrieveResults{
-		Ids: &schemapb.IDs{
-			IdField: &schemapb.IDs_IntId{
-				IntId: &schemapb.LongArray{
-					Data: []int64{1, 2, 3},
-				},
-			},
-		},
-		FieldsData: []*schemapb.FieldData{
-			col1,
-			col2,
-		},
-	}
-	finalRes, err := mergeRetrieveResults([]*segcorepb.RetrieveResults{subRes, subRes})
-	assert.NoError(t, err)
-	println(finalRes.String())
-}
diff --git a/internal/querynode/retrieve_service.go b/internal/querynode/retrieve_service.go
deleted file mode 100644
index 4934406605..0000000000
--- a/internal/querynode/retrieve_service.go
+++ /dev/null
@@ -1,183 +0,0 @@
-// Copyright (C) 2019-2020 Zilliz. All rights reserved.
-//
-// Licensed 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 querynode
-
-import (
-	"context"
-	"errors"
-	"strconv"
-
-	"go.uber.org/zap"
-
-	"github.com/milvus-io/milvus/internal/log"
-	"github.com/milvus-io/milvus/internal/msgstream"
-	"github.com/milvus-io/milvus/internal/util/trace"
-)
-
-type retrieveService struct {
-	ctx    context.Context
-	cancel context.CancelFunc
-
-	historical *historical
-	streaming  *streaming
-
-	retrieveMsgStream       msgstream.MsgStream
-	retrieveResultMsgStream msgstream.MsgStream
-
-	queryNodeID         UniqueID
-	retrieveCollections map[UniqueID]*retrieveCollection
-}
-
-func newRetrieveService(ctx context.Context,
-	historical *historical,
-	streaming *streaming,
-	factory msgstream.Factory) *retrieveService {
-
-	retrieveStream, _ := factory.NewQueryMsgStream(ctx)
-	retrieveResultStream, _ := factory.NewQueryMsgStream(ctx)
-
-	if len(Params.SearchChannelNames) > 0 && len(Params.SearchResultChannelNames) > 0 {
-		consumeChannels := Params.SearchChannelNames
-		consumeSubName := "RetrieveSubName"
-		retrieveStream.AsConsumer(consumeChannels, consumeSubName)
-		log.Debug("query node AsConsumer", zap.Any("retrieveChannels", consumeChannels), zap.Any("consumeSubName", consumeSubName))
-		producerChannels := Params.SearchResultChannelNames
-		retrieveResultStream.AsProducer(producerChannels)
-		log.Debug("query node AsProducer", zap.Any("retrieveResultChannels", producerChannels))
-	}
-
-	retrieveServiceCtx, retrieveServiceCancel := context.WithCancel(ctx)
-	return &retrieveService{
-		ctx:    retrieveServiceCtx,
-		cancel: retrieveServiceCancel,
-
-		historical: historical,
-		streaming:  streaming,
-
-		retrieveMsgStream:       retrieveStream,
-		retrieveResultMsgStream: retrieveResultStream,
-
-		queryNodeID:         Params.QueryNodeID,
-		retrieveCollections: make(map[UniqueID]*retrieveCollection),
-	}
-}
-
-func (rs *retrieveService) start() {
-	rs.retrieveMsgStream.Start()
-	rs.retrieveResultMsgStream.Start()
-	rs.consumeRetrieve()
-}
-
-func (rs *retrieveService) collectionCheck(collectionID UniqueID) error {
-	if ok := rs.historical.replica.hasCollection(collectionID); !ok {
-		err := errors.New("no collection found, collectionID = " + strconv.FormatInt(collectionID, 10))
-		log.Error(err.Error())
-		return err
-	}
-
-	return nil
-}
-
-func (rs *retrieveService) consumeRetrieve() {
-	for {
-		select {
-		case <-rs.ctx.Done():
-			return
-		default:
-			msgPack := rs.retrieveMsgStream.Consume()
-			if msgPack == nil || len(msgPack.Msgs) <= 0 {
-				continue
-			}
-			for _, msg := range msgPack.Msgs {
-				rm, ok := msg.(*msgstream.RetrieveMsg)
-				if !ok {
-					// Not a retrieve request, discard
-					continue
-				}
-				log.Info("RetrieveService consume retrieve message",
-					zap.Int64("collectionID", rm.CollectionID),
-					zap.Int64("requestID", msg.ID()),
-					zap.Any("requestType", "retrieve"),
-				)
-
-				sp, ctx := trace.StartSpanFromContext(rm.TraceCtx())
-				rm.SetTraceCtx(ctx)
-				err := rs.collectionCheck(rm.CollectionID)
-				if err != nil {
-					log.Debug("Failed to check collection exist, discard.",
-						zap.Int64("collectionID", rm.CollectionID),
-						zap.Int64("requestID", msg.ID()),
-						zap.Any("requestType", "retrieve"),
-					)
-					continue
-				}
-
-				_, ok = rs.retrieveCollections[rm.CollectionID]
-				if !ok {
-					rs.startRetrieveCollection(rm.CollectionID)
-					log.Debug("Receive retrieve request on new collection, start an new retrieve collection service",
-						zap.Int64("collectionID", rm.CollectionID),
-						zap.Int64("requestID", msg.ID()),
-						zap.Any("requestType", "retrieve"),
-					)
-				}
-
-				rs.retrieveCollections[rm.CollectionID].msgBuffer <- rm
-				log.Info("Put retrieve msg into msgBuffer",
-					zap.Any("requestID", msg.ID),
-					zap.Any("requestType", "retrieve"),
-				)
-				sp.Finish()
-			}
-		}
-	}
-}
-
-func (rs *retrieveService) close() {
-	if rs.retrieveMsgStream != nil {
-		rs.retrieveMsgStream.Close()
-	}
-	if rs.retrieveResultMsgStream != nil {
-		rs.retrieveResultMsgStream.Close()
-	}
-	for collectionID := range rs.retrieveCollections {
-		rs.stopRetrieveCollection(collectionID)
-	}
-	rs.retrieveCollections = make(map[UniqueID]*retrieveCollection)
-	rs.cancel()
-}
-
-func (rs *retrieveService) startRetrieveCollection(collectionID UniqueID) {
-	ctx1, cancel := context.WithCancel(rs.ctx)
-	rc := newRetrieveCollection(ctx1,
-		cancel,
-		collectionID,
-		rs.historical,
-		rs.streaming,
-		rs.retrieveResultMsgStream)
-	rs.retrieveCollections[collectionID] = rc
-	rc.start()
-}
-
-func (rs *retrieveService) hasRetrieveCollection(collectionID UniqueID) bool {
-	_, ok := rs.retrieveCollections[collectionID]
-	return ok
-}
-
-func (rs *retrieveService) stopRetrieveCollection(collectionID UniqueID) {
-	rc, ok := rs.retrieveCollections[collectionID]
-	if !ok {
-		log.Error("stopRetrieveCollection failed, collection doesn't exist", zap.Int64("collectionID", collectionID))
-	}
-	rc.cancel()
-	delete(rs.retrieveCollections, collectionID)
-}
diff --git a/internal/querynode/segment_test.go b/internal/querynode/segment_test.go
index 2d9fc6a901..b5dd9162f2 100644
--- a/internal/querynode/segment_test.go
+++ b/internal/querynode/segment_test.go
@@ -425,7 +425,7 @@ func TestSegment_segmentSearch(t *testing.T) {
 		log.Print("marshal placeholderGroup failed")
 	}
 
-	searchTimestamp := Timestamp(1020)
+	travelTimestamp := Timestamp(1020)
 	plan, err := createPlan(collection, dslString)
 	assert.NoError(t, err)
 	holder, err := parseSearchRequest(plan, placeHolderGroupBlob)
@@ -436,7 +436,7 @@ func TestSegment_segmentSearch(t *testing.T) {
 	searchResults := make([]*SearchResult, 0)
 	matchedSegments := make([]*Segment, 0)
 
-	searchResult, err := segment.segmentSearch(plan, placeholderGroups, []Timestamp{searchTimestamp})
+	searchResult, err := segment.segmentSearch(plan, placeholderGroups, []Timestamp{travelTimestamp})
 	assert.Nil(t, err)
 
 	searchResults = append(searchResults, searchResult)