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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11363) Need more diagnosis info when seeing Slow waitForAckedSeqno
Date Thu, 02 Feb 2017 01:12:51 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849214#comment-15849214

Xiao Chen commented on HDFS-11363:

Oops, thanks [~yzhangal], good catch!

I'd like to fix it at commit time if you agree.

> 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
>              Labels: supportability
>         Attachments: HDFS-11363.01.patch, HDFS-11363.02.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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