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https://issues.apache.org/jira/browse/HDFS-15000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16999776#comment-16999776
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Aiphago commented on HDFS-15000:
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submit demo patch.The main idea is to make IO opreate(the opreate may have
order depend) without lock and async and keep the opreate is in order.
> Improve FsDatasetImpl to avoid IO operation in datasetLock
> ----------------------------------------------------------
>
> Key: HDFS-15000
> URL: https://issues.apache.org/jira/browse/HDFS-15000
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Xiaoqiao He
> Assignee: Aiphago
> Priority: Major
> Attachments: HDFS-15000.001.patch
>
>
> As HDFS-14997 mentioned, some methods in #FsDatasetImpl such as
> #finalizeBlock, #finalizeReplica, #createRbw includes IO operation in the
> datasetLock, It will block some logic when IO load is very high. We should
> reduce grain fineness or move IO operation out of datasetLock.
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