liuguanghua created HDFS-17306:
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Summary: RBF:Router should not return nameservices that does not
enable observer nodes in RpcResponseHeaderProto
Key: HDFS-17306
URL: https://issues.apache.org/jira/browse/HDFS-17306
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: liuguanghua
If a cluster has 3 nameservices: ns1, ns2,ns3, and ns1 has observer
nodes, and client via DFSRouter comminutes with nns.
If DFS_ROUTER_OBSERVER_READ_DEFAULT_KEY enable, the client will receive
all nameservices in RpcResponseHeaderProto.
We should reduce rpc response size if nameservices don't enable observer
nodes.
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