Add a metrics instrumentation class to collect metrics about fair share
scheduler
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Key: MAPREDUCE-1873
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1873
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: contrib/fair-share
Affects Versions: 0.22.0
Reporter: Kai Ren
Export the following metrics:
1. num of starved jobs (jobs that get slots less then their fair share defined
in fair scheduler)
2. num of starved pools (pools that get assigned map or reduce less than its
min map slots or min reduce slots.
3. num of active pools
4. total min maps
5. total max maps
6. total min reduces
7. total max reduces
3~7 are available in FairSchedulerServlet. To report here is to create another
metrics data export path so that these metrics can be displayed in ODS, jmx or
ganglia.
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