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Posted to mapreduce-dev@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2017/07/18 20:54:00 UTC

[jira] [Created] (MAPREDUCE-6916) History server scheduling tasks at fixed rate can be problematic when those tasks are slow

Jason Lowe created MAPREDUCE-6916:
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             Summary: History server scheduling tasks at fixed rate can be problematic when those tasks are slow
                 Key: MAPREDUCE-6916
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6916
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobhistoryserver
    Affects Versions: 2.7.4
            Reporter: Jason Lowe


The job history server currently schedules both the task of moving jobs from intermediate to done and the task of cleaning jobs at a fixed rate.  If those tasks take longer than the rate period to execute then a backlog of to-be-scheduled tasks can build up and cause a long storm of them to execute later when the blockage clears.



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