Add writernode client

Signed-off-by: zhenshan.cao <zhenshan.cao@zilliz.com>

internal/querynode/collection_replica.go

@@ -351,9 +351,9 @@ func (colReplica *collectionReplicaImpl) addSegment(segmentID UniqueID, partitio
 		return err
 	}
 
-	partition, err := colReplica.getPartitionByTag(collectionID, partitionTag)
-	if err != nil {
-		return err
+	partition, err2 := colReplica.getPartitionByTag(collectionID, partitionTag)
+	if err2 != nil {
+		return err2
 	}
 
 	colReplica.mu.Lock()

internal/querynode/search_service.go

@@ -144,9 +144,9 @@ func (ss *searchService) receiveSearchMsg() {
 				err := ss.search(msg)
 				if err != nil {
 					log.Println(err)
-					err = ss.publishFailedSearchResult(msg, err.Error())
-					if err != nil {
-						log.Println("publish FailedSearchResult failed, error message: ", err)
+					err2 := ss.publishFailedSearchResult(msg, err.Error())
+					if err2 != nil {
+						log.Println("publish FailedSearchResult failed, error message: ", err2)
 					}
 				}
 			}
@@ -196,9 +196,9 @@ func (ss *searchService) doUnsolvedMsgSearch() {
 				err := ss.search(msg)
 				if err != nil {
 					log.Println(err)
-					err = ss.publishFailedSearchResult(msg, err.Error())
-					if err != nil {
-						log.Println("publish FailedSearchResult failed, error message: ", err)
+					err2 := ss.publishFailedSearchResult(msg, err.Error())
+					if err2 != nil {
+						log.Println("publish FailedSearchResult failed, error message: ", err2)
 					}
 				}
 			}

internal/writenode/client/client.go

@@ -0,0 +1,32 @@
+package writerclient
+
+import "github.com/zilliztech/milvus-distributed/internal/util/typeutil"
+
+type UniqueID = typeutil.UniqueID
+
+type Timestamp = typeutil.Timestamp
+
+type Client struct {
+}
+
+type SegmentDescription struct {
+	SegmentID UniqueID
+	IsClosed  bool
+	OpenTime  Timestamp
+	CloseTime Timestamp
+}
+
+func (c *Client) FlushSegment(semgentID UniqueID) error {
+	// push msg to pulsar channel
+	return nil
+}
+
+func (c *Client) DescribeSegment(semgentID UniqueID) (*SegmentDescription, error) {
+	// query etcd
+	return &SegmentDescription{}, nil
+}
+
+func (c *Client) GetInsertBinlogPaths(semgentID UniqueID) (map[int32]string, error) {
+	// query etcd
+	return nil, nil
+}