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From "Ravi Prakash (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4227) TimeWindow statistics are not updated for TaskTrackers which have been restarted.
Date Mon, 07 May 2012 16:56:48 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ravi Prakash updated MAPREDUCE-4227:
------------------------------------

    Attachment: MAPREDUCE-4227.branch-1.patch

Hi Matt,

I'm attaching the patch. It makes the following changes
1. buckets are removed only if there are more in the current TaskTrackers than are required
2. Earlier the TimeWindow statistics were not being updated asap. They would lag behind by
one "update cycle" I've fixed that as well.
3. I took the liberty to add some much needed javadocs in this JIRA.

Disclaimer: StatisticsCollector is being referenced in some AspectJ files. Unfortunately I
don't know how I can check if my changes affected anything in there. Any clues?
                
> TimeWindow statistics are not updated for TaskTrackers which have been restarted.
> ---------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4227
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4227
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.205.0
>            Reporter: Ravi Prakash
>            Assignee: Ravi Prakash
>         Attachments: MAPREDUCE-4227.branch-1.patch
>
>
> Whenever a TaskTracker is restarted after the JobTracker has been running for a while
(an hour / day maybe), the TimeWindow statistics on the JobTracker Active nodes page are stuck
at 0.

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