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https://issues.apache.org/jira/browse/HDFS-16582?focusedWorklogId=773069&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-773069
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ASF GitHub Bot logged work on HDFS-16582:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 21/May/22 00:31
            Start Date: 21/May/22 00:31
    Worklog Time Spent: 10m 
      Work Description: tomscut commented on PR #4323:
URL: https://github.com/apache/hadoop/pull/4323#issuecomment-1133482070

   > @tomscut would you like to give it a review too?
   
   Thanks @jojochuang for ping me, I'm looking at this.




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

    Worklog Id:     (was: 773069)
    Time Spent: 1h 10m  (was: 1h)

> Expose aggregate latency of slow node as perceived by the reporting node
> ------------------------------------------------------------------------
>
>                 Key: HDFS-16582
>                 URL: https://issues.apache.org/jira/browse/HDFS-16582
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Viraj Jasani
>            Assignee: Viraj Jasani
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> When any datanode is reported to be slower by another node, we expose the 
> slow node as well as the reporting nodes list for the slow node. However, we 
> don't provide latency numbers of the slownode as reported by the reporting 
> node. Having the latency exposed in the metrics would be really helpful for 
> operators to keep a track of how far behind a given slow node is performing 
> compared to the rest of the nodes in the cluster.
> The operator should be able to gather aggregated latencies of all slow nodes 
> with their reporting nodes in Namenode metrics.



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