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https://issues.apache.org/jira/browse/TEZ-1248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15371870#comment-15371870
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TezQA commented on TEZ-1248:
----------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12817248/TEZ-1248.1.patch
against master revision 608e15e.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 1 new
or modified test files.
{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:green}+1 core tests{color}. The patch passed unit tests in .
Test results:
https://builds.apache.org/job/PreCommit-TEZ-Build/1846//testReport/
Console output: https://builds.apache.org/job/PreCommit-TEZ-Build/1846//console
This message is automatically generated.
> Reduce slow-start should special case 1 reducer runs
> ----------------------------------------------------
>
> Key: TEZ-1248
> URL: https://issues.apache.org/jira/browse/TEZ-1248
> Project: Apache Tez
> Issue Type: Improvement
> Affects Versions: 0.5.0
> Environment: 20 node cluster running tez
> Reporter: Gopal V
> Assignee: Zhiyuan Yang
> Priority: Critical
> Attachments: TEZ-1248.1.patch
>
>
> Reducer slow-start has a performance problem for the small cases where there
> is just 1 reducer for a case with a single wave.
> Tez knows the split count and wave count, being able to determine if the
> cluster has enough spare capacity to run the reducer earlier for lower
> latency in a N-mapper -> 1 reducer case.
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