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https://issues.apache.org/jira/browse/HDFS-16424?focusedWorklogId=710211&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-710211
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ASF GitHub Bot logged work on HDFS-16424:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 18/Jan/22 01:48
            Start Date: 18/Jan/22 01:48
    Worklog Time Spent: 10m 
      Work Description: tasanuma commented on a change in pull request #3884:
URL: https://github.com/apache/hadoop/pull/3884#discussion_r786363769



##########
File path: 
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
##########
@@ -3158,6 +3161,9 @@ private void requeueCall(Call call)
         throws IOException, InterruptedException {
       try {
         internalQueueCall(call, false);
+        long deltaNanos = Time.monotonicNowNanos() - call.timestampNanos;

Review comment:
       Isn't it the same time as ENQUEUE calculated in `internalQueueCall(call, 
false)` of the before line?




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 710211)
    Time Spent: 1h  (was: 50m)

> 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
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> 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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