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https://issues.apache.org/jira/browse/HDFS-15180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17056011#comment-17056011
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zhuqi commented on HDFS-15180:
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Hi [~sodonnell]
Yeah, your comment is just my mean.
If we need add the top lock time information to the datanode metrics , so that
may help to make the future performance improvement decision.
> DataNode FsDatasetImpl Fine-Grained Locking via BlockPool.
> -----------------------------------------------------------
>
> Key: HDFS-15180
> URL: https://issues.apache.org/jira/browse/HDFS-15180
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.2.0
> Reporter: zhuqi
> Assignee: zhuqi
> Priority: Major
> Attachments: image-2020-03-10-17-22-57-391.png,
> image-2020-03-10-17-31-58-830.png, image-2020-03-10-17-34-26-368.png
>
>
> Now the FsDatasetImpl datasetLock is heavy, when their are many namespaces in
> big cluster. If we can split the FsDatasetImpl datasetLock via blockpool.
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