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https://issues.apache.org/jira/browse/MAPREDUCE-1825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988338#action_12988338
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Scott Chen commented on MAPREDUCE-1825:
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> 2) FairSchedulerServlet is locking up in showPools method as soon as it tries
> to synchronize on "scheduler". It continues again as soon as JIB.initTasks()
> finish. Not sure how this is happening as initTasks() lock JIB's monitor and
> showPools lock scheduler's monitor. Anyway, the patch doesn't seem to address
> the FSS issue.
Thanks for the testing, Priyo.
Can you take a jstack at the moment that it waits for scheduler?
Then we can figure out the lock dependency.
> jobqueue_details.jsp and FairSchedulerServelet should not call finishedMaps
> and finishedReduces when job is not initialized
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1825
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1825
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 0.20.1
> Reporter: Amareshwari Sriramadasu
> Assignee: Scott Chen
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1825.txt, MAPREDUCE-1825_1.txt,
> MAPREDUCE-1825_2.txt
>
>
> JobInProgress.finishedMaps() and finishedReduces() are synchronized. They are
> called from jobqueue_details.jsp and FairSchedulerServelet which iterates
> through all jobs. If any job is in initialization, these pages don't come up
> until the initialization finishes.
> See
> [comment|https://issues.apache.org/jira/browse/MAPREDUCE-1354?focusedCommentId=12834139&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12834139]
> for more details
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