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https://issues.apache.org/jira/browse/HDFS-15000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16979498#comment-16979498
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Wei-Chiu Chuang commented on HDFS-15000:
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Great idea. It reminds me of HDFS-8496 where we forcefully stops DataNode
threads if it holds the lock for too long.
It also reminds me of HDFS-11187 where it eliminates a lock held by block
sender when it reads a block.
> 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
>
> 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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