[YARN-1550] NPE in FairSchedulerAppsBlock#render

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.5.0
• Component/s: fairscheduler
• Hadoop Flags: Reviewed
• Assignee: Anubhav Dhoot
• Reporter: caolong
• Due: 06/Jan/14
• Created: 30/Dec/13 03:58
• Updated: 11/Oct/15 03:07
• Resolved: 02/Jun/14 20:30

Description

three Steps :
1、debug at RMAppManager#submitApplication after code
if (rmContext.getRMApps().putIfAbsent(applicationId, application) !=
null)

{ String message = "Application with id " + applicationId + " is already present! Cannot add a duplicate!"; LOG.warn(message); throw RPCUtil.getRemoteException(message); }

2、submit one application:hadoop jar ~/hadoop-current/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.0.0-ydh2.2.0-tests.jar sleep -Dhadoop.job.ugi=test2,#111111 -Dmapreduce.job.queuename=p1 -m 1 -mt 1 -r 1

3、go in page :http://ip:50030/cluster/scheduler and find 500 ERROR！

the log:

2013-12-30 11:51:43,795 ERROR org.apache.hadoop.yarn.webapp.Dispatcher: error handling URI: /cluster/scheduler
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        ....
Caused by: java.lang.NullPointerException
	at org.apache.hadoop.yarn.server.resourcemanager.webapp.FairSchedulerAppsBlock.render(FairSchedulerAppsBlock.java:96)
	at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:66)
	at org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:76)