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From "Kuhu Shukla (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (TEZ-3831) Reduce Unordered memory needed for storing empty completed events
Date Wed, 13 Sep 2017 22:17:00 GMT

    [ https://issues.apache.org/jira/browse/TEZ-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16165375#comment-16165375
] 

Kuhu Shukla edited comment on TEZ-3831 at 9/13/17 10:16 PM:
------------------------------------------------------------

Thank you [~jeagles] for reporting this and the patch.
+1 . LGTM.


was (Author: kshukla):
+1 . binding. LGTM.

> Reduce Unordered memory needed for storing empty completed events
> -----------------------------------------------------------------
>
>                 Key: TEZ-3831
>                 URL: https://issues.apache.org/jira/browse/TEZ-3831
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Jonathan Eagles
>            Assignee: Jonathan Eagles
>         Attachments: Screen Shot 2017-09-13 at 4.55.11 PM.png, TEZ-3831.001.patch
>
>
> the completedInputs blocking queue is used to store inputs for the UnorderedKVReader
to consume. With Auto-reduce parallelism enabled and nearly all empty inputs, the reader can't
prune the empty events from the blocking queue fast enough to keep up. In my scenario, an
OOM occurred. 



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