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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2340) optimize JobInProgress.initTasks()
Date Thu, 18 Oct 2012 08:16:08 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt Foley updated MAPREDUCE-2340:
----------------------------------

    Target Version/s: 0.22.0, 1.2.0  (was: 0.22.0, 1.1.0)
    
> optimize JobInProgress.initTasks()
> ----------------------------------
>
>                 Key: MAPREDUCE-2340
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2340
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobtracker
>    Affects Versions: 0.20.1, 0.21.0
>            Reporter: Kang Xiao
>              Labels: critical-0.22.0
>         Attachments: MAPREDUCE-2340.patch, MAPREDUCE-2340.patch, MAPREDUCE-2340.r1.diff
>
>
> JobTracker's hostnameToNodeMap cache can speed up JobInProgress.initTasks() and JobInProgress.createCache()
significantly. A test for 1 job with 100000 maps on a 2400 cluster shows nearly 10 and 50
times speed up for initTasks() and createCache(). 

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