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https://issues.apache.org/jira/browse/HDFS-11363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HDFS-11363:
-----------------------------
    Target Version/s: 2.9.0
              Status: Patch Available  (was: Open)

> Need more diagnosis info when seeing Slow waitForAckedSeqno
> -----------------------------------------------------------
>
>                 Key: HDFS-11363
>                 URL: https://issues.apache.org/jira/browse/HDFS-11363
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Yongjun Zhang
>            Assignee: Xiao Chen
>         Attachments: HDFS-11363.01.patch
>
>
> When client writes a file, it may get the following message when ACK doesn't 
> get back in a timely manner:
> WARN hdfs.DFSClient: Slow waitForAckedSeqno took 39264ms (threshold=30000ms)
> It would be nice to tell what file it's writing, and what DataNodes are in 
> the pipeline, together with this message, to facilitate investigating related 
> performance issue.



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