zhanghaobo created HDFS-16424:
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Summary: Add a new rpcMetric called requeueTime
Key: HDFS-16424
URL: https://issues.apache.org/jira/browse/HDFS-16424
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: zhanghaobo
When observer namenode read enabled, if `call.getClientStateId() >
alignmentContext.getLastSeenStateId()`, the rpc call will be requeued to
callQueue.
we need to know rpc requeue metrics to monitor requeue call and its performance.
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