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https://issues.apache.org/jira/browse/TEZ-2251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14393799#comment-14393799
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Hadoop QA commented on TEZ-2251:
--------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12709109/TEZ-2251.3.patch
against master revision aec3f6b.
{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 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in .
Test results: https://builds.apache.org/job/PreCommit-TEZ-Build/385//testReport/
Console output: https://builds.apache.org/job/PreCommit-TEZ-Build/385//console
This message is automatically generated.
> Enabling auto reduce parallelism in certain jobs causes DAG to hang
> -------------------------------------------------------------------
>
> Key: TEZ-2251
> URL: https://issues.apache.org/jira/browse/TEZ-2251
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Attachments: TEZ-2251.2.patch, TEZ-2251.3.patch,
> TEZ-2251.VertexImpl.patch, TEZ-2251.VertexImpl.readlock.patch,
> TEZ-2251.fix_but_slows_down.patch, hive_console.png,
> tez-2251.vertexpatch.am.log.gz, tez_2251_dag.png
>
>
> Scenario:
> - Run TPCH query20
> (https://github.com/cartershanklin/hive-testbench/blob/master/sample-queries-tpch/tpch_query20.sql)
> at 1 TB scale (tez-master branch, hive trunk)
> - Enable auto reduce parallelism
> - DAG didn't complete and got stuck in "Reducer 6"
> Vertex parallelism of "Reducer 5 & 6" happens within a span of 3
> milliseconds, and tasks of "reducer 5" ends up producing wrong partition
> details as it sees the updated task numbers of reducer 6 when scheduled.
> This causes, job to hang.
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