zhihai xu created MAPREDUCE-6020: ------------------------------------ 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. -- This message was sent by Atlassian JIRA (v6.2#6252)