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https://issues.apache.org/jira/browse/YARN-2309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14067379#comment-14067379
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Devaraj K commented on YARN-2309:
---------------------------------

Dup of YARN-1919.

> NPE during RM-Restart test scenario
> -----------------------------------
>
>                 Key: YARN-2309
>                 URL: https://issues.apache.org/jira/browse/YARN-2309
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.4.0
>            Reporter: Nishan Shetty
>            Priority: Minor
>
> During RMRestart test scenarios, we met with below exception. 
> A point to note here is, Zookeeper also was not stable during this testing, 
> we could see many Zookeeper exception before getting this NPE
> {code}
> 2014-07-10 10:49:46,817 WARN org.apache.hadoop.service.AbstractService: When 
> stopping the service 
> org.apache.hadoop.yarn.server.resourcemanager.EmbeddedElectorService : 
> java.lang.NullPointerException
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.EmbeddedElectorService.serviceStop(EmbeddedElectorService.java:108)
>       at 
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
>       at 
> org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
>       at 
> org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
>       at 
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:171)
>       at 
> org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.AdminService.serviceInit(AdminService.java:125)
>       at 
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
>       at 
> org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:232)
>       at 
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1039)
> {code}
> Zookeeper Exception
> {code}
> 2014-07-10 10:49:46,816 INFO org.apache.hadoop.service.AbstractService: 
> Service org.apache.hadoop.yarn.server.resourcemanager.EmbeddedElectorService 
> failed in state INITED; cause: 
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode 
> = ConnectionLoss
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode 
> = ConnectionLoss
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>       at 
> org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef.waitForZKConnectionEvent(ActiveStandbyElector.java:1046)
>       at 
> org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef.access$400(ActiveStandbyElector.java:1017)
>       at 
> org.apache.hadoop.ha.ActiveStandbyElector.getNewZooKeeper(ActiveStandbyElector.java:632)
>       at 
> org.apache.hadoop.ha.ActiveStandbyElector.createConnection(ActiveStandbyElector.java:766)
> {code}



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