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https://issues.apache.org/jira/browse/MAPREDUCE-1246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amar Kamat updated MAPREDUCE-1246:
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Description: 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.loseTaskTracker() from processHeartbeat(). Later on the tracker is
added back (addNewTracker()) which will update the tracker count in metrics
andinstrumentation. But the problem is that when the old tracker is lost the
metrics and instrumentation's tracker counts are not decremented resulting into
incorrect trackers count. (was: 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. )
Summary: JobTrackerStatistics/JobTrackerInstrumentation's tracker count
will be incorrect if a live tracker is restarted on the same port (was:
JobTrackerStatistics/JobTrackerInstrumentation counts will be incorrect if a
live tracker is restarted on the same port)
> JobTrackerStatistics/JobTrackerInstrumentation's tracker count will be
> incorrect if a live tracker is restarted on the same port
> --------------------------------------------------------------------------------------------------------------------------------
>
> 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.loseTaskTracker() from processHeartbeat(). Later on the tracker is
> added back (addNewTracker()) which will update the tracker count in metrics
> andinstrumentation. But the problem is that when the old tracker is lost the
> metrics and instrumentation's tracker counts are not decremented resulting
> into incorrect trackers count.
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