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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2384) Can MR make error response Immediately?
Date Fri, 25 May 2012 07:00:25 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13283176#comment-13283176
] 

Harsh J commented on MAPREDUCE-2384:
------------------------------------

Since this is trivial: Just adds in a test that compiles fine, passes for now and can help
prevent regressions of this nature in future refactoring of the submit path (validated by
running it against 1.x, where it is indeed broken, but is not critical in any way), I'm going
ahead with the commit by Monday unless someone has raised an objection.

Thanks,
Harsh
                
> 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,
MAPREDUCE-2384.r4.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
requirements.
>  
>         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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