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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-901) Move Framework Counters into a TaskMetric structure
Date Mon, 24 Aug 2009 23:16:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747133#action_12747133
] 

Arun C Murthy commented on MAPREDUCE-901:
-----------------------------------------

Hmm... at the risk of sounding completely lame, I can't seem to find the definition of TaskMetrics
or TaskCounters - did you forget to do included that in the patch?

>From the description it seems like TaskMetrics is related to Counters, maybe I should
wait to see the patch - anyway I was hoping TaskMetrics would be a Writable and isn't related
to Counters at all.

> 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
>
>
> 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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