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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4710) Add peak memory usage counter for each task
Date Sat, 06 Oct 2012 10:09:03 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470964#comment-13470964
] 

Harsh J commented on MAPREDUCE-4710:
------------------------------------

Cindy,

Thanks! This would come useful.

The branch-1 is a maintenance branch that should not receive new features first and diverge
from trunk. Please also provide a trunk patch that can go in first, so we maintain feature
parity. Or if trunk does not require this, please explain.
                
> Add peak memory usage counter for each task
> -------------------------------------------
>
>                 Key: MAPREDUCE-4710
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4710
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: task
>    Affects Versions: 1.0.2
>            Reporter: Cindy Li
>            Priority: Minor
>              Labels: patch
>         Attachments: mapreduce-4710.patch
>
>
> Each task has counters PHYSICAL_MEMORY_BYTES and VIRTUAL_MEMORY_BYTES, which are snapshots
of memory usage of that task. They are not sufficient for users to understand peak memory
usage by that task, e.g. in order to diagnose task failures, tune job parameters or change
application design. This new feature will add two more counters for each task: PHYSICAL_MEMORY_BYTES_MAX
and VIRTUAL_MEMORY_BYTES_MAX. 

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