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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4425) Speculation + Fetch failures can lead to a hung job
Date Mon, 12 Nov 2012 16:19:14 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495374#comment-13495374
] 

Hadoop QA commented on MAPREDUCE-4425:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12553125/MAPREDUCE-4425.patch
  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-app.

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3012//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3012//console

This message is automatically generated.
                
> Speculation + Fetch failures can lead to a hung job
> ---------------------------------------------------
>
>                 Key: MAPREDUCE-4425
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4425
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: Siddharth Seth
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: MAPREDUCE-4425.patch, MAPREDUCE-4425.patch
>
>
> After a task goes to SUCCEEDED, FAILED/KILLED attempts are ignored.
> 1. attemp1 starts
> 2. speculative attempt starts
> 3. attempt 1 completes - Task moves to SUCCEEDED state
> 4. speculative attempt is KILLED
> 5. T_ATTEMPT_KILLED is ignored.
> 6. attemp1 1 fails with TOO_MANY_FETCH_FAILURES
> The job will effectively hang, since a new task attempt isn't started.

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