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https://issues.apache.org/jira/browse/YARN-6207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15880193#comment-15880193
 ] 

Bibin A Chundatt commented on YARN-6207:
----------------------------------------

[~sunilg]
Thank you for confirming the same..
{code}
 source.getParent().finishApplication(appId, user);
{code}
Should i outside {{app != null}} loop.. Consider scenarios of
{{Application submit -> Attempt not added ->  Move -> attempt added.}} 
Application count in parent queue will be wrong .  Explaining in detail.

# Submit application to leaf . Parent queue ++numApplications will increase by 
1 . 
# Move to queue 1              . Parent queue ++numApplications will increase 
by 1 .
# Application completed.  Number of application in parent will be still 1.



> Move application can  fail when attempt add event is delayed
> ------------------------------------------------------------
>
>                 Key: YARN-6207
>                 URL: https://issues.apache.org/jira/browse/YARN-6207
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler
>            Reporter: Bibin A Chundatt
>            Assignee: Bibin A Chundatt
>         Attachments: YARN-6207.001.patch, YARN-6207.002.patch, 
> YARN-6207.003.patch, YARN-6207.004.patch
>
>
> *Steps to reproduce*
> 1.Submit application  and delay attempt add to Scheduler
> (Simulate using debug at EventDispatcher for SchedulerEventDispatcher)
> 2. Call move application to destination queue.
> {noformat}
> Caused by: 
> org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException): 
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.preValidateMoveApplication(CapacityScheduler.java:2086)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.RMAppManager.moveApplicationAcrossQueue(RMAppManager.java:669)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.moveApplicationAcrossQueues(ClientRMService.java:1231)
>       at 
> org.apache.hadoop.yarn.api.impl.pb.service.ApplicationClientProtocolPBServiceImpl.moveApplicationAcrossQueues(ApplicationClientProtocolPBServiceImpl.java:388)
>       at 
> org.apache.hadoop.yarn.proto.ApplicationClientProtocol$ApplicationClientProtocolService$2.callBlockingMethod(ApplicationClientProtocol.java:537)
>       at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:522)
>       at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
>       at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:867)
>       at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:813)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:422)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1892)
>       at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2659)
>       at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1483)
>       at org.apache.hadoop.ipc.Client.call(Client.java:1429)
>       at org.apache.hadoop.ipc.Client.call(Client.java:1339)
>       at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)
>       at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:115)
>       at com.sun.proxy.$Proxy7.moveApplicationAcrossQueues(Unknown Source)
>       at 
> org.apache.hadoop.yarn.api.impl.pb.client.ApplicationClientProtocolPBClientImpl.moveApplicationAcrossQueues(ApplicationClientProtocolPBClientImpl.java:398)
>       ... 16 more
> {noformat}



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