[jira] [Commented] (TEZ-3733) Auto-Reduce Parallelism needs to consider shuffle overhead to avoid OOM

["TezQA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-3733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16014869#comment-16014869 ] 

TezQA commented on TEZ-3733:
----------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment
  http://issues.apache.org/jira/secure/attachment/12868606/TEZ-3733.1.patch
  against master revision e3ee7a6.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version 3.0.1) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in :
                   org.apache.tez.dag.library.vertexmanager.TestShuffleVertexManagerBase

Test results: https://builds.apache.org/job/PreCommit-TEZ-Build/2461//testReport/
Console output: https://builds.apache.org/job/PreCommit-TEZ-Build/2461//console

This message is automatically generated.

> Auto-Reduce Parallelism needs to consider shuffle overhead to avoid OOM
> -----------------------------------------------------------------------
>
>                 Key: TEZ-3733
>                 URL: https://issues.apache.org/jira/browse/TEZ-3733
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Jonathan Eagles
>            Assignee: Jonathan Eagles
>         Attachments: TEZ-3733.1.patch
>
>
> For each fetch there is associated memory overhead per partition which can be enough to affect the number of tasks needed to process the data. In some cases the reduction can be so severe the tasks can OOM due to overhead.



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