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From "Kang Xiao (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2340) optimize JobInProgress.initTasks()
Date Mon, 21 Feb 2011 04:58:38 GMT
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: 0.21.0, 0.20.1
            Reporter: Kang Xiao


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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