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https://issues.apache.org/jira/browse/MAPREDUCE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239322#comment-13239322
]
Bhallamudi Venkata Siva Kamesh commented on MAPREDUCE-4071:
-----------------------------------------------------------
MRAppMaster received shutdown signal just before executing start method of
ContainerAllocatorRouter service. So while executing shutdown hook
of MRAppMaster
{code:title=MRAppMaster.java|borderStyle=solid}
if(appMaster.containerAllocator instanceof ContainerAllocatorRouter) {
((ContainerAllocatorRouter) appMaster.containerAllocator)
.setSignalled(true);
}
{code}
above code tries set the flag of containerAllocator object in
ContainerAllocatorRouter#setSignalled(). But containerAllocator object has been
instantiated while executing start method. So containerAllocator is null and
hence NPE.
> NPE while executing MRAppMaster shutdown hook
> ---------------------------------------------
>
> Key: MAPREDUCE-4071
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4071
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mr-am, mrv2
> Affects Versions: 0.23.1, 0.23.2, 0.23.3
> Reporter: Bhallamudi Venkata Siva Kamesh
>
> While running the shutdown hook of MRAppMaster, hit NPE
> {noformat}
> Exception in thread "Thread-1" java.lang.NullPointerException
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$ContainerAllocatorRouter.setSignalled(MRAppMaster.java:668)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$MRAppMasterShutdownHook.run(MRAppMaster.java:1004)
> {noformat}
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