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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.
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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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