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https://issues.apache.org/jira/browse/MAPREDUCE-2464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved MAPREDUCE-2464.
------------------------------------

    Resolution: Duplicate

> NullPointerException is coming in the job tracker when job tracker resends 
> the previous heartbeat response.
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2464
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2464
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.23.0
>            Reporter: Devaraj K
>            Assignee: Devaraj K
>
> Over the network, the heartbeat response sent by Job Tracker to Task Tracker 
> might get lost. When Task Tracker sends the old heart beat again to Job 
> Tracker then Job Tracker finds and ignores it saying duplicate and resends 
> the old heartbeat response which it is maintaining in a map. If the response 
> contains LaunchTaskAction for MapTask, then the NullPointerException is 
> throwing.
> {code:xml} 
> 2011-05-02 16:01:53,148 INFO org.apache.hadoop.ipc.Server: IPC Server handler 
> 1 on 9001 caught: java.lang.NullPointerException
>       at org.apache.hadoop.mapred.MapTask.write(MapTask.java:140)
>       at 
> org.apache.hadoop.mapred.LaunchTaskAction.write(LaunchTaskAction.java:48)
>       at 
> org.apache.hadoop.mapred.HeartbeatResponse.write(HeartbeatResponse.java:91)
>       at 
> org.apache.hadoop.io.ObjectWritable.writeObject(ObjectWritable.java:163)
>       at org.apache.hadoop.io.ObjectWritable.write(ObjectWritable.java:74)
>       at org.apache.hadoop.ipc.Server.setupResponse(Server.java:1561)
>       at org.apache.hadoop.ipc.Server.access$2800(Server.java:96)
>       at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1433)
> {code} 

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