Add metrics to tasktracker to indicate the number of slots occupied
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Key: MAPREDUCE-3589
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3589
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: tasktracker
Affects Versions: 0.22.0, 0.20.205.0, 0.20.203.0
Reporter: ade
Priority: Minor
The number of tasks running on the tasktracker is indicated by
maps/reduces_running metrics. But, if multiple slots occupied by a
task(capacity scheduler), we can not get info of the slot. So, add metrics to
tasktracker to indicate the number of slots occupied
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