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From "Robert Joseph Evans (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3944) JobHistory web services are slower then the UI and can easly overload the JH
Date Wed, 29 Feb 2012 22:45:57 GMT
JobHistory web services are slower then the UI and can easly overload the JH
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                 Key: MAPREDUCE-3944
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3944
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.1, 0.23.2
            Reporter: Robert Joseph Evans
            Assignee: Robert Joseph Evans
            Priority: Blocker


When our first customer started using the Job History web services today the History Server
ground to a halt.  We found 250 Jetty threads stuck on the following stack trace.

{noformat}
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.apache.hadoop.mapreduce.v2.hs.JobHistory.getJob(JobHistory.java:898)
        - waiting to lock <0x00002aaab364ba60> (a org.apache.hadoop.mapreduce.v2.hs.JobHistory)
        at org.apache.hadoop.mapreduce.v2.hs.webapp.HsWebServices.getJobs(HsWebServices.java:188)
{noformat}

HsWebServices.java:188 corresponds to the /mapreduce/jobs service.

Looking at the code there are a number of optimizations that need to be done to improve its
performance.

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