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From "Sharad Agarwal (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3490) RMContainerAllocator counts failed maps towards Reduce ramp up
Date Wed, 28 Dec 2011 12:09:30 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176623#comment-13176623
] 

Sharad Agarwal commented on MAPREDUCE-3490:
-------------------------------------------

Note: I am on vacation rest of the week. please expect slow or no response till then.
                
> RMContainerAllocator counts failed maps towards Reduce ramp up
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-3490
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3490
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Arun C Murthy
>            Priority: Blocker
>         Attachments: MAPREDUCE-3490.patch, MAPREDUCE-3490.patch, MAPREDUCE-3490.patch,
MAPREDUCE-3490.patch, MR-3490-alternate.patch, MR-3490-alternate1.patch
>
>
> The RMContainerAllocator does not differentiate between failed and successful maps while
calculating whether reduce tasks are ready to launch. Failed tasks are also counted towards
total completed tasks. 
> Example. 4 failed maps, 10 total maps. Map%complete = 4/14 * 100 instead of being 0.

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