JobTrackerStatistics/JobTrackerInstrumentation counts will be incorrect if a
live tracker is restarted on the same port
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Key: MAPREDUCE-1246
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1246
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Reporter: Amar Kamat
Consider a case where an active tracker is restarted and the tracker restarts
on the same port. In such a case the jobtracker we will invoke
JobTracker.loseTracker() from processHeartbeat(). Later on the tracker is added
back (addNewTracker()) which will update the metrics and instrumentation. But
the problem is that when the old tracker is lost the metric/instrumentation
counts are not accounted for.
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