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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-901) Move Framework Counters into a TaskMetric structure
Date Tue, 25 Aug 2009 18:39:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747552#action_12747552
] 

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

The patch proabably needs some cleanup w.r.t passing the TaskMetrics object to the TaskStatus
methods. Some of the methods may not require to be passed the TaskMetrics object.. 

> 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: Devaraj Das
>             Fix For: 0.21.0
>
>         Attachments: 901_1.patch, 901_1.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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