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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 Thu, 30 Sep 2010 22:35:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916719#action_12916719
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Arun C Murthy commented on MAPREDUCE-901:
-----------------------------------------

bq. I'm proposing a new approach to this issue: refactor the counter framework (while keeping
the existing api) so that it's possible to have different implementation of counter groups,
one of which is the FrameworkCounterGroup (see attached file.)

This seems reasonable... I would be interested in a more sketched out version of the patch.
Btw, can you ensure (unit tests) that end-user code for JobSubmissionProtocol.getCounters
has no regression? Thanks.

> 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: Luke Lu
>         Attachments: 901_1.patch, 901_1.patch, FrameworkCounterGroup.java, MAPREDUCE-901.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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