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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4246) Reduce task copy errors may not kill it eventually
Date Wed, 01 Oct 2008 05:03:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu updated HADOOP-4246:
--------------------------------------------

    Status: Patch Available  (was: Open)

test-patch result:
{noformat}
     [exec] -1 overall.
     [exec]
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec]
     [exec]     -1 tests included.  The patch doesn't appear to include any new or modified
tests.
     [exec]                         Please justify why no tests are needed for this patch.
     [exec]
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec]
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec]
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec]
     [exec]     +1 Eclipse classpath. The patch retains Eclipse classpath integrity.
     [exec]
     [exec]
{noformat}
All core and contrib tests passed on my machine.

It is difficult to write a unit test simulating reduce-copy errors. 
The patch is manually tested. And ran Sort benchmark with the patch.

> Reduce task copy errors may not kill it eventually
> --------------------------------------------------
>
>                 Key: HADOOP-4246
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4246
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.0
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>            Priority: Blocker
>             Fix For: 0.19.0
>
>         Attachments: patch-4246.txt, patch-4246.txt, patch-4246.txt, patch-4246.txt
>
>
> maxFetchRetriesPerMap in reduce task can be zero some times (when maxMapRunTime is less
than 4 seconds or mapred.reduce.copy.backoff is less than 4). This will not count reduce task
copy errors to kill it eventually.

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