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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5746) Errors encountered in MROutputThread after the last map/reduce call can go undetected
Date Thu, 04 Jun 2009 12:23:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716259#action_12716259
] 

Amar Kamat commented on HADOOP-5746:
------------------------------------

Result of test-patch
{code}
 [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]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.
[code}

Streaming tests passed on my box except TestStreamingExitStatus which fails even on trunk.


> Errors encountered in MROutputThread after the last map/reduce call can go undetected
> -------------------------------------------------------------------------------------
>
>                 Key: HADOOP-5746
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5746
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/streaming
>            Reporter: Devaraj Das
>             Fix For: 0.21.0
>
>         Attachments: 5746-reproduce.1.patch, 5746-testcase.patch, 5746.1.patch, 5746.6.patch
>
>
> The framework map/reduce bridge methods make a check at the beginning of the respective
methods whether _MROutputThread_ encountered an exception while writing keys/values that the
streaming process emitted. However, if the exception happens in _MROutputThread_ after the
last call to the map/reduce method, the exception goes undetected. An example of such an exception
is an exception from the _DFSClient_ that fails to write to a file on the HDFS.

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