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https://issues.apache.org/jira/browse/MAPREDUCE-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12997292#comment-12997292
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Aaron T. Myers commented on MAPREDUCE-2340:
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Thanks a lot for doing this performance analysis, Kang. Your results seem
promising.
Quick comment on the patch: it seems to me that if you find {{node}} to be
{{null}} you should then be assigning the result of
{{jobtracker.resolveAndAddToTopology(host)}} to the {{node}} variable. As it
stands {{node}} will still be null entering the loop.
> 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
> Attachments: MAPREDUCE-2340.patch
>
>
> 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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