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https://issues.apache.org/jira/browse/MAPREDUCE-4129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ahmed Radwan updated MAPREDUCE-4129:
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    Attachment: MAPREDUCE-4129.patch

Attaching a patch addressing this issue. The patch modifies the behavior to 
only write the log message the first time the oldGroupName is found, instead of 
every time getGroup(..) is called.
I don't think we need a test case for this change as it is a straightforward 
change in message logging.
                
> Lots of unneeded counters log messages
> --------------------------------------
>
>                 Key: MAPREDUCE-4129
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4129
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: Ahmed Radwan
>            Assignee: Ahmed Radwan
>             Fix For: 0.23.2
>
>         Attachments: MAPREDUCE-4129.patch
>
>
> Huge number of the same WARN messages are written. We only need to write each 
> distinct message once. The messages are of the form:
> {code}
> 2012-04-05 03:55:04,166 WARN mapreduce.Counters: Group {oldGroup} is 
> deprecated. Use {newGroup} instead
> {code}

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