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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4710) Add peak memory usage counter for each task
Date Tue, 09 Oct 2012 05:26:03 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472146#comment-13472146
] 

Arun C Murthy commented on MAPREDUCE-4710:
------------------------------------------

Cindy - thanks for the patch. As Harsh explained you'll have to port this patch to trunk also.
Please let me know if you need any help with that.

One comment on the patch - rather than track peak memory in Task.java I'd rather have a getPeakMemory
interface defined in the ProcResourceValues structure so that the logic for this is all in
one place. Makes sense? Thanks.
                
> 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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