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https://issues.apache.org/jira/browse/SPARK-21188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060422#comment-16060422
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Apache Spark commented on SPARK-21188:
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User 'liufengdb' has created a pull request for this issue:
https://github.com/apache/spark/pull/18400
> releaseAllLocksForTask should synchronize the whole method
> ----------------------------------------------------------
>
> Key: SPARK-21188
> URL: https://issues.apache.org/jira/browse/SPARK-21188
> Project: Spark
> Issue Type: Bug
> Components: Block Manager, Spark Core
> Affects Versions: 2.1.0, 2.2.0
> Reporter: Feng Liu
>
> Since the objects readLocksByTask, writeLocksByTask and infos are coupled and
> supposed to be modified by other threads concurrently, all the read and
> writes of them in the releaseAllLocksForTask method should be protected by a
> single synchronized block. The fine-grained synchronization in the current
> code can cause some test flakiness.
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