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https://issues.apache.org/jira/browse/MAPREDUCE-2058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907862#action_12907862
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Scott Chen commented on MAPREDUCE-2058:
---------------------------------------
Quickly looked at the code. JobTracker.infoServer is started in the constructor
of JobTracker.
But FairScheduler.start() which initialize FairScheduler.poolMgr is called in
JobTracker.offerService().
So in this period if someone visite the page the NPE will be thrown.
> FairScheduler:NullPointerException in web interface when JobTracker not
> initialized
> -----------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2058
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2058
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/fair-share
> Affects Versions: 0.22.0
> Reporter: Dan Adkins
>
> When I contact the jobtracker web interface prior to the job tracker being
> fully initialized (say, if hdfs is still in safe mode), I get the following
> error:
> 10/09/09 18:06:02 ERROR mortbay.log: /jobtracker.jsp
> java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.FairScheduler.getJobs(FairScheduler.java:909)
> at
> org.apache.hadoop.mapred.JobTracker.getJobsFromQueue(JobTracker.java:4357)
> at
> org.apache.hadoop.mapred.JobTracker.getQueueInfoArray(JobTracker.java:4334)
> at
> org.apache.hadoop.mapred.JobTracker.getRootQueues(JobTracker.java:4295)
> at
> org.apache.hadoop.mapred.jobtracker_jsp.generateSummaryTable(jobtracker_jsp.java:44)
> at
> org.apache.hadoop.mapred.jobtracker_jsp._jspService(jobtracker_jsp.java:176)
> 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:502)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1124)
> at
> org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:857)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1115)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:361)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
> at
> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
> at
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:324)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
> at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
> at
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
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