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https://issues.apache.org/jira/browse/TEZ-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17009156#comment-17009156
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Prasanth Jayachandran commented on TEZ-4087:
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+1 (non-binding)
> Shuffle: Fix shuffle cleanup to prevent thread leaks
> ----------------------------------------------------
>
> Key: TEZ-4087
> URL: https://issues.apache.org/jira/browse/TEZ-4087
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In certain cases, Shuffle's cleanupIgnoreErrors() is not called. This leaves
> 4 threads (inmem, diskmerger, Referee, ShuffleAndMergeRunner) run forever.
> When these are run in long running processes (e.g LLAP in Hive), they reach
> the thread limits over time.
> Note: Root cause why cleanupIgnoreErrors() is not invoked is not yet known. I
> will share the details when i get more details on this. Creating this ticket
> to add additional safety knobs to ensure that thread leaks do not happen.
>
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