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From sandeep reddy <lackkireddysand...@yahoo.com>
Subject Map tasks never getting started
Date Fri, 12 Apr 2013 09:45:47 GMT
Hi,

While running a mapred job map task never getting assigned. The message for a map in web interface
is "No Task Attempts found".
When I check the logs there are couple of errors as following:

2013-04-12 02:29:04,454 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException
as:jobs cause:java.io.IOException: java.lang.NullPointerException
2013-04-12 02:29:04,455 INFO org.apache.hadoop.ipc.Server: IPC Server handler 8 on 4571, call
heartbeat(org.apache.hadoop.mapred.TaskTrackerStatus@8f9c09e, false, false, true, 4) from
192.168.2.20:59968: error: java.io.IOException: java.lang.NullPointerException
java.io.IOException: java.lang.NullPointerException
        at org.apache.hadoop.mapred.JobInProgress.getMatchingLevelForNodes(JobInProgress.java:1699)
        at org.apache.hadoop.mapred.JobInProgress.addRunningTaskToTIP(JobInProgress.java:1784)
        at org.apache.hadoop.mapred.JobInProgress.obtainNewNonLocalMapTask(JobInProgress.java:1440)
        at org.apache.hadoop.mapred.JobQueueTaskScheduler.assignTasks(JobQueueTaskScheduler.java:189)
        at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:3398)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)
2013-04-12 02:29:04,463 INFO org.apache.hadoop.mapred.JobTracker: Removing task 'attempt_201304120228_0001_m_000002_0'

Some please help me to resolve this issue.
I am using hadoop-1.0.2

Thanks,
Sandeep.

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