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Date: Thu, 24 Sep 2009 02:24:15 -0700 (PDT)
From: "V.V.Chaitanya Krishna (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1007) MAPREDUCE-777 breaks the UI for
 hierarchial Queues.
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759070#action_12759070 ] 

V.V.Chaitanya Krishna commented on MAPREDUCE-1007:
--------------------------------------------------

The UI is not being displayed when a hierarchy of queues in built with atleast one container queue (i.e., atleast one non-leaf queue). 
There is no check for occurrence of null pointer in CapacityTaskScheduler.getJobs(queueName) and when the container queue's name is given as input parameter, it fails with NPE.

The above patch is to handle this issue. It also includes test cases written to check the behaviour when a job is submitted to a container queue.

> MAPREDUCE-777 breaks the UI for hierarchial Queues. 
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-1007
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1007
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.21.0
>            Reporter: rahul k singh
>            Assignee: V.V.Chaitanya Krishna
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: MAPREDUCE-1007-1.patch, MAPREDUCE-1007.patch
>
>
> MAPREDUCE-777 breaks jobtracker UI for hierarchial queues. When jobtracker.jsp is accessed, it throws the following exception:
> {code}
> java.lang.NullPointerException
> 	at org.apache.hadoop.mapred.CapacityTaskScheduler.getJobs(CapacityTaskScheduler.java:1007)
> 	at org.apache.hadoop.mapred.JobTracker.getJobsFromQueue(JobTracker.java:3888)
> 	at org.apache.hadoop.mapred.JobTracker.getQueueInfoArray(JobTracker.java:3869)
> 	at org.apache.hadoop.mapred.JobTracker.getRootQueues(JobTracker.java:3830)
> 	at org.apache.hadoop.mapred.jobtracker_jsp.generateSummaryTable(jobtracker_jsp.java:36)
>         .... 
> {code}
> (Issue number and the line number in code match - 1007. Some fun for a Hadoop developer :) )

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