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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2323) Add metrics to the fair scheduler
Date Sun, 13 Feb 2011 03:28:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994016#comment-12994016

Todd Lipcon commented on MAPREDUCE-2323:

Would appreciate feedback on the following:
- is the locking correct for updateMetrics? I take a lock on the scheduler and then the poolmanager,
but no other locks.
- could it be finer grain? (do I need the coarse scheduler lock at all? unclear)

- should I add a configuration to disable the job-level metrics and only use pool-level metrics?
- when a user pool becomes empty, should we remove its metrics records?

> Add metrics to the fair scheduler
> ---------------------------------
>                 Key: MAPREDUCE-2323
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2323
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: contrib/fair-share
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.0
>         Attachments: mr-2323-20.txt
> It would be useful to be able to monitor various metrics in the fair scheduler, like
demand, fair share, min share, and running task count.

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