[jira] [Commented] (TEZ-4087) Shuffle: Fix shuffle cleanup to prevent thread leaks

["Prasanth Jayachandran (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17009156#comment-17009156 ] 

Prasanth Jayachandran commented on TEZ-4087:
--------------------------------------------

+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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