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https://issues.apache.org/jira/browse/SPARK-13796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15208692#comment-15208692
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Josh Rosen commented on SPARK-13796:
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We should probably downgrade the log message's severity to WARNING because
there are currently some non-error cases where locks won't be released before
the end of the task (such as the {{take()}} operation's per-partition limits,
which partially consume an iterator but may still leave remaining elements
without performing a close() or dispose() operation).
> Lock release errors occur frequently in executor logs
> -----------------------------------------------------
>
> Key: SPARK-13796
> URL: https://issues.apache.org/jira/browse/SPARK-13796
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.0.0
> Reporter: Nishkam Ravi
> Priority: Minor
>
> Executor logs contain a lot of these error messages (irrespective of the
> workload):
> 16/03/08 17:53:07 ERROR executor.Executor: 1 block locks were not released by
> TID = 1119
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