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Date: Sat, 2 May 2015 03:32:07 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Message-ID: <JIRA.12680962.1385357539000.55791.1430537527038@Atlassian.JIRA>
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 <JIRA.12680962.1385357539223@arcas>
Subject: [jira] [Commented] (MAPREDUCE-5649) Reduce cannot use more than 2G
 memory  for the final merge
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-5649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524514#comment-14524514 ] 

Hadoop QA commented on MAPREDUCE-5649:
--------------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 46s | Pre-patch trunk compilation is healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any @author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to include 1 new or modified test files. |
| {color:green}+1{color} | javac |   7m 29s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 29s | There were no new javadoc warning messages. |
| {color:green}+1{color} | release audit |   0m 24s | The applied patch does not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 54s | There were no new checkstyle issues. |
| {color:red}-1{color} | whitespace |   0m  1s | The patch has 1  line(s) that end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 15s | The patch does not introduce any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | mapreduce tests |   1m 36s | Tests passed in hadoop-mapreduce-client-core. |
| | |  38m  4s | |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12729903/MAPREDUCE-5649.002.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / f1a152c |
| whitespace | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5487/artifact/patchprocess/whitespace.txt |
| hadoop-mapreduce-client-core test log | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5487/artifact/patchprocess/testrun_hadoop-mapreduce-client-core.txt |
| Test Results | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5487/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf902.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5487/console |


This message was automatically generated.

> Reduce cannot use more than 2G memory  for the final merge
> ----------------------------------------------------------
>
>                 Key: MAPREDUCE-5649
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5649
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>            Reporter: stanley shi
>            Assignee: Gera Shegalov
>         Attachments: MAPREDUCE-5649.001.patch, MAPREDUCE-5649.002.patch
>
>
> In the org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.java file, in the finalMerge method: 
>  int maxInMemReduce = (int)Math.min(
>         Runtime.getRuntime().maxMemory() * maxRedPer, Integer.MAX_VALUE);
>  
> This means no matter how much memory user has, reducer will not retain more than 2G data in memory before the reduce phase starts.


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