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https://issues.apache.org/jira/browse/YARN-6207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15874011#comment-15874011
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Bibin A Chundatt commented on YARN-6207:
----------------------------------------

[~sunilg]/[~naganarasimha...@apache.org]
Hope the second approach done is fine. Fair already handles this case of 
attempt can be null in scheduler side.
Any scenario which causes attempt to be null will get handled with approach 2

> 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
>            Reporter: Bibin A Chundatt
>            Assignee: Bibin A Chundatt
>         Attachments: YARN-6207.001.patch, YARN-6207.002.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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