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MapReduce >> mail # user >> Map tasks never getting started


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sandeep reddy 2013-04-12, 09:45
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Re: Map tasks never getting started
Your rack topology configuration is broken (mismatching levels) and
you're therefore hitting MAPREDUCE-1740. Either upgrade to a more
current release, or fix your rack configuration to be of the same
levels for all mapped nodes (including the default rack value used
upon a mismatch) and restart the JobTracker.

On Fri, Apr 12, 2013 at 3:15 PM, sandeep reddy
<[EMAIL PROTECTED]> wrote:
> 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.

--
Harsh J
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sandeep reddy 2013-04-12, 10:12
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Harsh J 2013-04-12, 10:23