runzhiwang commented on a change in pull request #364:
URL: https://github.com/apache/incubator-ratis/pull/364#discussion_r546455511



##########
File path: 
ratis-client/src/main/java/org/apache/ratis/client/api/DataStreamApi.java
##########
@@ -44,4 +48,7 @@ default DataStreamOutput stream() {
 
   /** Create a stream by providing a customized header message. */
   DataStreamOutput stream(ByteBuffer headerMessage);
+
+  /** Create a stream by providing a customized header message and route 
table. */
+  DataStreamOutput stream(ByteBuffer headerMessage, Map<RaftPeerId, 
List<RaftPeerId>> routingTable);

Review comment:
       @szetszwo Maybe we also need to expose the map to user, because we need 
encode map to proto, the lambda `peerId -> 
Optional.ofNullable(map.get(peerId)).orElseGet(Collections::emptySet)` is not 
enough.




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