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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1354) Incremental enhancements to the JobTracker for better scalability
Date Tue, 16 Feb 2010 23:15:29 GMT

     [ 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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