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https://issues.apache.org/jira/browse/HDFS-11363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849039#comment-15849039
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Yongjun Zhang commented on HDFS-11363:
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Thanks [~xiaochen] for the patch.
The patch is largely what I want, but some comments/suggestions:
1. print out the array in the current patch way won't work. suggest to use
{{Arrays.toString(array)}}
2. Replace {{File:}} with {{File being written:}}
3. Replace {{datanodes:}} with {{Write pipeline datanodes:}}
Does that make sense to you?
Thanks.
> 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
>
>
> 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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