diff --git a/internal/distributed/datacoord/client/client.go b/internal/distributed/datacoord/client/client.go
index 8c50b2f00c..754a2da27d 100644
--- a/internal/distributed/datacoord/client/client.go
+++ b/internal/distributed/datacoord/client/client.go
@@ -81,7 +81,7 @@ func (c *Client) getDataCoordAddr() (string, error) {
 	ms, ok := msess[key]
 	if !ok {
 		log.Debug("DataCoordClient, not existed in msess ", zap.Any("key", key), zap.Any("len of msess", len(msess)))
-		return "", fmt.Errorf("number of datacoord is incorrect, %d", len(msess))
+		return "", fmt.Errorf("find no available datacoord, check datacoord state")
 	}
 	return ms.Address, nil
 }
diff --git a/internal/distributed/indexcoord/client/client.go b/internal/distributed/indexcoord/client/client.go
index 467e466846..a754a2a1a9 100644
--- a/internal/distributed/indexcoord/client/client.go
+++ b/internal/distributed/indexcoord/client/client.go
@@ -98,7 +98,7 @@ func (c *Client) getIndexCoordAddr() (string, error) {
 	ms, ok := msess[key]
 	if !ok {
 		log.Debug("IndexCoordClient msess key not existed", zap.Any("key", key), zap.Any("len of msess", len(msess)))
-		return "", fmt.Errorf("number of indexcoord is incorrect, %d", len(msess))
+		return "", fmt.Errorf("find no available indexcoord, check indexcoord state")
 	}
 	return ms.Address, nil
 }
diff --git a/internal/distributed/querycoord/client/client.go b/internal/distributed/querycoord/client/client.go
index 4c97175ec6..9965001a2b 100644
--- a/internal/distributed/querycoord/client/client.go
+++ b/internal/distributed/querycoord/client/client.go
@@ -81,7 +81,7 @@ func (c *Client) getQueryCoordAddr() (string, error) {
 	ms, ok := msess[key]
 	if !ok {
 		log.Debug("QueryCoordClient msess key not existed", zap.Any("key", key))
-		return "", fmt.Errorf("number of querycoord is incorrect, %d", len(msess))
+		return "", fmt.Errorf("find no available querycoord, check querycoord state")
 	}
 	return ms.Address, nil
 }
diff --git a/internal/distributed/rootcoord/client/client.go b/internal/distributed/rootcoord/client/client.go
index 161048b519..0b9816b2ee 100644
--- a/internal/distributed/rootcoord/client/client.go
+++ b/internal/distributed/rootcoord/client/client.go
@@ -91,7 +91,7 @@ func (c *Client) getRootCoordAddr() (string, error) {
 	ms, ok := msess[key]
 	if !ok {
 		log.Warn("RootCoordClient mess key not exist", zap.Any("key", key))
-		return "", fmt.Errorf("number of RootCoord is incorrect, %d", len(msess))
+		return "", fmt.Errorf("find no available rootcoord, check rootcoord state")
 	}
 	log.Debug("RootCoordClient GetSessions success", zap.String("address", ms.Address))
 	return ms.Address, nil