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https://issues.apache.org/jira/browse/HDFS-15180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118797#comment-17118797
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Xiaoqiao He commented on HDFS-15180:
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Thanks [~sodonnell] for your positive feedback. 
{quote}
we were hoping to get HDFS-15160 committed first, as its a smaller and possibly 
simpler change
{quote}
It makes sense to me. my colleague [~Aiphag0] and me would like to follow up 
and push this feature forward after HDFS-15160 has been ready. Welcome any 
suggestions and discussion if anyone is interested in this changes.

>  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: Aiphago
>            Priority: Major
>         Attachments: HDFS-15180.001.patch, HDFS-15180.002.patch, 
> HDFS-15180.003.patch, HDFS-15180.004.patch, 
> 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, image-2020-04-09-11-20-36-459.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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