xkrogen commented on code in PR #4584:
URL: https://github.com/apache/hadoop/pull/4584#discussion_r929398786
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hadoop-common-project/hadoop-common/src/main/proto/RpcHeader.proto:
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@@ -157,6 +158,7 @@ message RpcResponseHeaderProto {
optional bytes clientId = 7; // Globally unique client ID
optional sint32 retryCount = 8 [default = -1];
optional int64 stateId = 9; // The last written Global State ID
+ map<string, int64> nameserviceStateIds = 10; // Last seen state IDs for
multiple nameservices.
Review Comment:
Doesn't this field need to be `optional` for backwards compatibility?
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