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https://issues.apache.org/jira/browse/HDFS-15382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17123372#comment-17123372
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Aiphago commented on HDFS-15382:
--------------------------------
Now we deploy in our produce cluster use this patch for some days.Here is the
metric by random choose some dn.The metric we add before upgrade with this
patch.The unit is ms.
!image-2020-06-02-1.png|width=923,height=233!
> Split DataNode FsDatasetImpl lock to blockpool volume lock
> -----------------------------------------------------------
>
> Key: HDFS-15382
> URL: https://issues.apache.org/jira/browse/HDFS-15382
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Aiphago
> Assignee: Aiphago
> Priority: Major
> Fix For: 3.2.1
>
> Attachments: image-2020-06-02-1.png
>
>
> In HDFS-15180 we split lock to blockpool grain size.But when one volume is in
> heavy load and will block other request which in same blockpool but different
> volume.So we split lock to two leval to avoid this happend.And to improve
> datanode performance.
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