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From "Rohini Palaniswamy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TEZ-3831) Reduce Unordered memory needed for storing empty completed events
Date Wed, 13 Sep 2017 22:10:00 GMT

    [ https://issues.apache.org/jira/browse/TEZ-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16165368#comment-16165368
] 

Rohini Palaniswamy commented on TEZ-3831:
-----------------------------------------

+1. Looks good to me

> 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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