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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2384) Can MR make error response Immediately?
Date Sat, 12 May 2012 13:36:50 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13274000#comment-13274000

Hadoop QA commented on MAPREDUCE-2384:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 1 new or modified test files.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2383//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2383//console

This message is automatically generated.
> Can MR make error response Immediately?
> ---------------------------------------
>                 Key: MAPREDUCE-2384
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2384
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: job submission
>    Affects Versions: 0.21.0
>            Reporter: Denny Ye
>            Assignee: Harsh J
>         Attachments: MAPREDUCE-2384.r1.diff, MAPREDUCE-2384.r2.diff, MAPREDUCE-2384.r3.diff,
> When I read the source code of MapReduce in Hadoop 0.21.0, sometimes it made me confused
about error response. For example:
>         1. JobSubmitter checking output for each job. MapReduce makes rule to limit that
each job output must be not exist to avoid fault overwrite. In my opinion, MR should verify
output at the point of client submitting. Actually, it copies related files to specified target
and then, doing the verifying. 
>         2. JobTracker.   Job has been submitted to JobTracker. In first step, JT create
JIT object that is very "huge" . Next step, JT start to verify job queue authority and memory
>         In normal case, verifying client input then response immediately if any cases
in fault. Regular logic can be performed if all the inputs have passed.  
>         It seems like that those code does not make sense for understanding. Is only
my personal opinion? Wish someone help me to explain the details. Thanks!

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