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Date: Tue, 16 Feb 2010 23:15:29 +0000 (UTC)
From: "Arun C Murthy (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Updated: (MAPREDUCE-1354) Incremental enhancements to the
 JobTracker for better scalability
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-1354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy updated MAPREDUCE-1354:
-------------------------------------

    Environment: Incremental enhancements to the JobTracker include a no-lock version of JT.getTaskCompletion events, no lock on the JT while doing i/o during job-submission and several fixes to cut down configuration parsing during heartbeat-handling.

> Incremental enhancements to the JobTracker for better scalability
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-1354
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1354
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>         Environment: Incremental enhancements to the JobTracker include a no-lock version of JT.getTaskCompletion events, no lock on the JT while doing i/o during job-submission and several fixes to cut down configuration parsing during heartbeat-handling.
>            Reporter: Devaraj Das
>            Assignee: Arun C Murthy
>            Priority: Critical
>         Attachments: MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch
>
>
> It'd be nice to have the JobTracker object not be locked while accessing the HDFS for reading the jobconf file and while writing the jobinfo file in the submitJob method. We should see if we can avoid taking the lock altogether.

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