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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4919) All maps hangs when set mapreduce.task.io.sort.factor to 1
Date Tue, 08 Jan 2013 09:30:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546727#comment-13546727

Hadoop QA commented on MAPREDUCE-4919:

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {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}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) 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 hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3209//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3209//console

This message is automatically generated.
> All maps hangs when set mapreduce.task.io.sort.factor to 1
> ----------------------------------------------------------
>                 Key: MAPREDUCE-4919
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4919
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: client
>    Affects Versions: trunk
>            Reporter: Jerry Chen
>            Assignee: Jerry Chen
>             Fix For: trunk
>         Attachments: MAPREDUCE-4919.patch
>   Original Estimate: 2h
>  Remaining Estimate: 2h
> In one of my testing that when I set mapreduce.task.io.sort.factor to 1, all the maps
hang and will never end. But the CPU usage for each node are very high and until killed by
the app master when time out comes, and the job failed. 
> I traced the problem and found out that all the maps hangs on the final merge phase.
> The while loop in computeBytesInMerges will never end with a factor of 1:
> int f = 1; //in my case
> int n = 16; //in my case
> while (n > f || considerFinalMerge) {
>   ...
>   n -= (f-1);
>   f = factor;
> }
> As the f-1 will equals 0 and n will always be 16 and the while runs for ever.

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