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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-901) Move Framework Counters into a TaskMetric structure
Date Fri, 12 Aug 2011 00:39:28 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13083846#comment-13083846
] 

Luke Lu commented on MAPREDUCE-901:
-----------------------------------

The port, which includes smarter counter limits (exclude framework counters for limits) lgtm.
Defer +1 to Jenkins. There are some improvements can be made to improve binary compatibility
(for most existing job jars) that we did/does not promise, deferring to a separate JIRA if
binary compatibility becomes an issue.

> 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
>             Fix For: 0.23.0
>
>         Attachments: 901_1.patch, 901_1.patch, FrameworkCounterGroup.java, MAPREDUCE-901.patch,
MAPREDUCE-901.patch, MAPREDUCE-901.patch, mr-901-trunk-v1.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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