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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-901) Move Framework Counters into a TaskMetric structure
Date Thu, 03 Sep 2009 17:51:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12751105#action_12751105
] 

Devaraj Das commented on MAPREDUCE-901:
---------------------------------------

Looked at the latest patch. One thing that needs to be done here is that the JobInProgress
counters needs to be updated with the TaskMetrics long values..

> Move Framework Counters into a TaskMetric structure
> ---------------------------------------------------
>
>                 Key: MAPREDUCE-901
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-901
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: task
>    Affects Versions: 0.21.0
>            Reporter: Owen O'Malley
>            Assignee: Arun C Murthy
>             Fix For: 0.21.0
>
>         Attachments: 901_1.patch, 901_1.patch, MAPREDUCE-901.patch
>
>
> I think we should move all of the Counters that the framework updates into a single class
called TaskMetrics. TaskMetrics would have specific fields for each of the metrics like input
records, input bytes, output records, etc.
> It would both reduce the serialized size of the heartbeats (by shrinking the Counters
down to just the user's counters) and decrease the latency for updates to the JobTracker (since
Counters are sent at most 1/minute instead of 1/heartbeat).

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