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Posted to mapreduce-issues@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2011/05/02 21:14:03 UTC
[jira] [Resolved] (MAPREDUCE-2464) NullPointerException is coming
in the job tracker when job tracker resends the previous heartbeat
response.
[ https://issues.apache.org/jira/browse/MAPREDUCE-2464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
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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