Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/18400
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GitHub user liufengdb opened a pull request:
https://github.com/apache/spark/pull/18400
[SPARK-21188][CORE] releaseAllLocksForTask should synchronize the whole
method
## What changes were proposed in this pull request?
Since the objects `readLocksByTask`, `writeLocksByTask`
