zhengchenyu commented on code in PR #4311:
URL: https://github.com/apache/hadoop/pull/4311#discussion_r923272813
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hadoop-common-project/hadoop-common/src/main/proto/RpcHeader.proto:
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@@ -91,6 +91,7 @@ message RpcRequestHeaderProto { // the header for the
RpcRequest
optional RPCTraceInfoProto traceInfo = 6; // tracing info
optional RPCCallerContextProto callerContext = 7; // call context
optional int64 stateId = 8; // The last seen Global State ID
+ map<string, int64> nameserviceStateIds = 9; // Last seen state IDs for
multiple nameservices.
Review Comment:
Should we not use map in proto?
It is not compatibility to old hadoop version which is based on protobuf2.5.
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