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From Vandana Ayyalasomayajula <vayya...@uci.edu>
Subject Problem with configuring Fair Schduler
Date Mon, 03 May 2010 04:57:14 GMT
Hi All,

I am trying to configure fair scheduler in hadoop. I have followed all 
the instructions given in hadoop common docs ( 
http://hadoop.apache.org/common/docs/current/fair_scheduler.html#Configuring+the+Fair+scheduler

). But when I try to click on the job queue in the job tracker page , I 
see the following exception:

java.lang.NullPointerException
	at org.apache.hadoop.mapred.FairScheduler.getJobs(FairScheduler.java:765)
	at org.apache.hadoop.mapred.jobqueue_005fdetails_jsp._jspService(jobqueue_005fdetails_jsp.java:64)
	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.handle(ServletHandler.java:363)
	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)

If anybody has come across this problem, please do let me know where I 
am going wrong.

Thanks for the help.
Vandana

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