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https://issues.apache.org/jira/browse/HDFS-6110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938745#comment-13938745
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Liang Xie commented on HDFS-6110:
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seems HDFS-3751 is a superset for current jira ? my original intend is just
add logging inside BlockReceiver(and DFSOutputStream) class, it's seems enough
for HBase write outlier investigation to me at least. And still lots of other
write codes besides BlockReceiver have lengthy disk IOs, i did not care about
those during my digging HBase write spike issue.
> adding more slow action log in critical write path
> --------------------------------------------------
>
> Key: HDFS-6110
> URL: https://issues.apache.org/jira/browse/HDFS-6110
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.0.0, 2.3.0
> Reporter: Liang Xie
> Assignee: Liang Xie
>
> After digging a HBase write spike issue caused by slow buffer io in our
> cluster, just realize we'd better to add more abnormal latency warning log in
> write flow, such that if other guys hit HLog sync spike, we could know more
> detail info from HDFS side at the same time.
> Patch will be uploaded soon.
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