[ https://issues.apache.org/jira/browse/MAPREDUCE-6858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yufei Gu updated MAPREDUCE-6858: -------------------------------- Description: - JHS scans "done_intermediate" dir for files to process and adds them to a thread pool - Thread pool starts processing these files to move them to "done" dir - JHS scans "done_intermediate" again for files to process and adds them to a thread pool -- If we have enough jobs where the thread pool can't keep up with the scanning interval, they'll get added twice (or more). If this keeps compounding, I wouldn't be surprised if jobs end up piling up and not getting processed for quite some time and getting lots of FileNotFoundException's. By default, it looks like the thread pool only has 3 threads in it (mapreduce.jobhistory.move.thread-count). And the scan interval is 3 minutes (mapreduce.jobhistory.move.interval-ms). Perhaps we should increase these? was: - JHS scans "done_intermediate" dir for files to process and adds them to a thread pool - Thread pool starts processing these files to move them to "done" dir JHS scans "done_intermediate" again for files to process and adds them to a thread pool -- If we have enough jobs where the thread pool can't keep up with the scanning interval, they'll get added twice (or more). If this keeps compounding, I wouldn't be surprised if jobs end up piling up and not getting processed for quite some time and getting lots of FileNotFoundException's. By default, it looks like the thread pool only has 3 threads in it (mapreduce.jobhistory.move.thread-count). And the scan interval is 3 minutes (mapreduce.jobhistory.move.interval-ms). Perhaps we should increase these? > HistoryFileManager thrashing due to high volume jobs > ----------------------------------------------------- > > Key: MAPREDUCE-6858 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-6858 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: jobhistoryserver > Reporter: Yufei Gu > > - JHS scans "done_intermediate" dir for files to process and adds them to a > thread pool > - Thread pool starts processing these files to move them to "done" dir > - JHS scans "done_intermediate" again for files to process and adds them to a > thread pool > -- If we have enough jobs where the thread pool can't keep up with the > scanning interval, they'll get added twice (or more). If this keeps > compounding, I wouldn't be surprised if jobs end up piling up and not getting > processed for quite some time and getting lots of FileNotFoundException's. > By default, it looks like the thread pool only has 3 threads in it > (mapreduce.jobhistory.move.thread-count). And the scan interval is 3 minutes > (mapreduce.jobhistory.move.interval-ms). Perhaps we should increase these? -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: mapreduce-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: mapreduce-issues-h...@hadoop.apache.org