zhihai xu created MAPREDUCE-6020:
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Summary: Too many threads blocking on the global JobTracker lock
from getJobCounters, optimize getJobCounters to release global JobTracker lock
before access the per job counter in JobInProgress
Key: MAPREDUCE-6020
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6020
Project: Hadoop Map/Reduce
Issue Type: Improvement
Affects Versions: 0.23.10
Reporter: zhihai xu
Assignee: zhihai xu
Too many threads blocking on the global JobTracker lock from getJobCounters,
optimize getJobCounters to release global JobTracker lock before access the per
job counter in JobInProgress. It may be a lot of JobClients to call
getJobCounters in JobTracker at the same time, Current code will lock the
JobTracker to block all the threads to get counter from JobInProgress. It is
better to unlock the JobTracker when get counter from
JobInProgress(job.getCounters(counters)). So all the theads can run parallel
when access its own job counter.
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