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Date: Wed, 13 Jun 2012 18:01:44 +0000 (UTC)
From: "Alejandro Abdelnur (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
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Subject: [jira] [Resolved] (MAPREDUCE-4195) With invalid queueName request
 param, jobqueue_details.jsp shows NPE
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-4195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alejandro Abdelnur resolved MAPREDUCE-4195.
-------------------------------------------

    Resolution: Fixed

Thanks Gera. Committed to branch-1
                
> With invalid queueName request param, jobqueue_details.jsp shows NPE
> --------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4195
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4195
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 1.0.0
>            Reporter: Gera Shegalov
>            Priority: Critical
>             Fix For: 1.1.0
>
>         Attachments: MR-4195, MR-4195
>
>
> When you access /jobqueue_details.jsp manually, instead of via a link, it has queueName set to null internally and this goes for a lookup into the scheduling info maps as well.
> As a result, if using FairScheduler, a Pool with String name = null gets created and this brings the scheduler down. I have not tested what happens to the CapacityScheduler, but ideally if no queueName is set in that jsp, it should fall back to 'default'. Otherwise, this brings down the JobTracker completely.
> FairScheduler must also add a check to not create a pool with 'null' name.
> The following is the strace that ensues:
> {code}
> ERROR org.mortbay.log: /jobqueue_details.jsp 
> java.lang.NullPointerException 
> at org.apache.hadoop.mapred.jobqueue_005fdetails_jsp._jspService(jobqueue_005fdetails_jsp.java:71) 
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) 
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) 
> at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
> at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221) 
> at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:829) 
> at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) 
> at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399) 
> at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
> at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
> at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766) 
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450) 
> at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230) 
> at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
> at org.mortbay.jetty.Server.handle(Server.java:326) 
> at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 
> at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928) 
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549) 
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) 
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
> at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410) 
> at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) 
> INFO org.apache.hadoop.ipc.Server: IPC Server handler 2 on 9001, call heartbeat from XYZ:MNOP: error: java.io.IOException: java.lang.NullPointerException 
> java.io.IOException: java.lang.NullPointerException 
> at org.apache.hadoop.mapred.SchedulingAlgorithms$FairShareComparator.compare(SchedulingAlgorithms.java:95) 
> at org.apache.hadoop.mapred.SchedulingAlgorithms$FairShareComparator.compare(SchedulingAlgorithms.java:68) 
> at java.util.Arrays.mergeSort(Unknown Source) 
> at java.util.Arrays.sort(Unknown Source) 
> at java.util.Collections.sort(Unknown Source) 
> at org.apache.hadoop.mapred.FairScheduler.assignTasks(FairScheduler.java:435) 
> at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:3226) 
> at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source) 
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
> at java.lang.reflect.Method.invoke(Unknown Source) 
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557) 
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1434) 
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1430) 
> at java.security.AccessController.doPrivileged(Native Method) 
> at javax.security.auth.Subject.doAs(Unknown Source) 
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1127) 
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1428)
> {code}

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