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https://issues.apache.org/jira/browse/YARN-3425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389348#comment-14389348
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Wangda Tan commented on YARN-3425:
----------------------------------

Thanks for reporting this, [~bibinchundatt]. Updated title a little bit, this 
is caused by when RMNodeLabelsManager fails to call serviceInit, dispatcher 
keeps null, so serviceStop will cause the NPE exception. Fix LGTM, will commit 
it later.

> NPE from RMNodeLabelsManager.serviceStop when NodeLabelsManager.serviceInit 
> failed
> ----------------------------------------------------------------------------------
>
>                 Key: YARN-3425
>                 URL: https://issues.apache.org/jira/browse/YARN-3425
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>         Environment: 1 RM, 1 NM , 1 NN , I DN
>            Reporter: Bibin A Chundatt
>            Assignee: Bibin A Chundatt
>            Priority: Minor
>         Attachments: YARN-3425.001.patch
>
>
> Configure yarn.node-labels.enabled to true 
> and yarn.node-labels.fs-store.root-dir /node-labels
> Start resource manager without starting DN/NM
> {quote}
> 2015-03-31 16:44:13,782 WARN org.apache.hadoop.service.AbstractService: When 
> stopping the service 
> org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager : 
> java.lang.NullPointerException
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager.stopDispatcher(CommonNodeLabelsManager.java:261)
>       at 
> org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager.serviceStop(CommonNodeLabelsManager.java:267)
>       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.ResourceManager$RMActiveServices.serviceInit(ResourceManager.java:556)
>       at 
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.createAndInitActiveServices(ResourceManager.java:984)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:251)
>       at 
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1207)
> {quote}
> {code}
>  protected void stopDispatcher() {
>     AsyncDispatcher asyncDispatcher = (AsyncDispatcher) dispatcher;
>        asyncDispatcher.stop(); 
>   }
> {code}
> Null check missing during stop



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