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https://issues.apache.org/jira/browse/HDFS-15180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17080192#comment-17080192
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Aiphago commented on HDFS-15180:
--------------------------------
Hi [~zhuqi] , thanks for your feedback.I think GenerationStamp may be change
before we split block pool lock.And in our version we use wrtie lock in
DataNode.transferReplicaForPipelineRecovery,this is diff the patch and may
related to this problem.
> 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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