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From "Amar Kamat (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-4100) Sometimes gridmix emulates data larger much larger then acutal counter for map only jobs
Date Thu, 19 Apr 2012 04:29:12 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amar Kamat resolved MAPREDUCE-4100.
-----------------------------------

             Tags: gridmix compression-emulation map-only-jobs
       Resolution: Fixed
    Fix Version/s: 0.24.0
         Assignee: Amar Kamat
     Release Note: Bug fixed in compression emulation feature for map only jobs.
     Hadoop Flags: Reviewed

I just committed this to trunk. Thanks Ravi for the review.
                
> Sometimes gridmix emulates data larger much larger then acutal counter for map only jobs
> ----------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4100
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4100
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/gridmix
>    Affects Versions: 1.1.0
>            Reporter: Karam Singh
>            Assignee: Amar Kamat
>            Priority: Minor
>             Fix For: 0.24.0
>
>         Attachments: mapreduce-4100-v1.2.patch
>
>
> While running 1400+ jobs trace I encountered this issue.
> For map-only jobs, observed that some Maps generating data of around 9 GB (From HDFS_BYTES_WRITTEN)
whereas actual value is around 5GB in trace.
> This can sometimes also cause jobs to fail intermittently.
> Other GridMix version coming be Hadoop-1.1.X and above might also effected 

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