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https://issues.apache.org/jira/browse/MAPREDUCE-3944?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Joseph Evans updated MAPREDUCE-3944:
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Attachment: MR-3944.txt
This changes the Web service to use a partial job, when returning a full list
of jobs. I will file a separate JIRA to deal with the locking issues, and a
separate one to look at how we can update the web service to reduce the load it
puts on the system, like cursers.
> JobHistory web services are slower then the UI and can easly overload the JH
> ----------------------------------------------------------------------------
>
> 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
> Attachments: MR-3944.txt
>
>
> 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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