Job tracker should report the number of splits that are local to some task
trackers
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Key: HADOOP-2015
URL: https://issues.apache.org/jira/browse/HADOOP-2015
Project: Hadoop
Issue Type: Improvement
Components: mapred
Reporter: Runping Qi
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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