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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-2464) NullPointerException is coming in the job tracker when job tracker resends the previous heartbeat response.
Date Mon, 02 May 2011 19:14:03 GMT

     [ 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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