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From "Vinod Kumar Vavilapalli (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2855) ResourceBundle lookup during counter name resolution takes a lot of time
Date Tue, 28 Feb 2012 02:03:48 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated MAPREDUCE-2855:
-----------------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.23.2
     Release Note: Passing a cached class-loader to ResourceBundle creator to minimize counter
names lookup time.
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Just committed to trunk, branch-0.23 and branch-0.23.2. Thanks Sid for the patch and the validation!

Thanks Todd for filing the ticket and suggesting a fix!
                
> ResourceBundle lookup during counter name resolution takes a lot of time
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2855
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2855
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Siddharth Seth
>              Labels: mrv2
>             Fix For: 0.23.2
>
>         Attachments: MR2855.txt
>
>
> Loading a job status page in trunk takes a lot of time, and it seems like most of the
time is spent resolving counter names. Looking through the JDK source, ResourceBundle.getBundle(String)
ends up calling getClassContext() which is not very efficient. I think if we pass our own
classloader manually it will be faster. In Counters.incrAllCounters, we may also be able to
avoid setting the counter name if one is already set.

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