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https://issues.apache.org/jira/browse/HADOOP-2015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12537455
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Owen O'Malley commented on HADOOP-2015:
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I think for most users this is unwanted information. I'd be much happier if the
information was just logged on the JT where an interested sysadmin could mine
the data, but where it wouldn't confuse the user.
> Job tracker should report the number of splits that are local to some task
> trackers
> -----------------------------------------------------------------------------------
>
> Key: HADOOP-2015
> URL: https://issues.apache.org/jira/browse/HADOOP-2015
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Reporter: Runping Qi
> Assignee: Runping Qi
> Attachments: hadoop-2015.txt
>
>
> Right now, jon tracker keeps track the number of launched mappers with local
> data.
> However, it is not clear how many mappers that are potentially be launched
> with data locality.
> This information is readily available in Job Tracker. It is just a matter to
> create a separate global counter
> and set it at the Job Tracker initialization time.
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