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From "Ramya R (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-820) NPE in TT heartbeat when there is a problem resolving the network topology
Date Mon, 03 Aug 2009 13:30:15 GMT
NPE in TT heartbeat when there is a problem resolving the network topology
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                 Key: MAPREDUCE-820
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-820
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker
            Reporter: Ramya R
            Priority: Minor


When there is a problem while resolving the network topology (such as a non existent topology.script.file.name),
NPE is being thrown in the TT heartbeats. Below is the exception obtained:

{noformat}
error: java.io.IOException: java.lang.NullPointerException
java.io.IOException: java.lang.NullPointerException
        at org.apache.hadoop.mapred.JobTracker.resolveAndAddToTopology(JobTracker.java:2663)
        at org.apache.hadoop.mapred.JobTracker.addNewTracker(JobTracker.java:2645)
        at org.apache.hadoop.mapred.JobTracker.processHeartbeat(JobTracker.java:3093)
        at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:2836)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
{noformat}

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