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https://issues.apache.org/jira/browse/SPARK-13796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15189389#comment-15189389
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Benjamin Herta commented on SPARK-13796:
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We have been seeing this as well, running with trunk as of this morning. It
doesn't appear to affect our results, so it may be just log noise, or maybe our
testing isn't thorough enough to see the problem. One easy way to reproduce it
is to run the org.apache.spark.examples.mllib.LBFGSExample example program.
> 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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