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From "Harsh J (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-4038) null pointer exception and invocationtarget exception in jobtracker logs
Date Tue, 20 Mar 2012 05:49:50 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J resolved MAPREDUCE-4038.
--------------------------------

    Resolution: Invalid

Hi,

This JIRA is for all issues with the framework, not user code. Since {{JobQueueTaskScheduler1}}
isn't a class we provide, am marking this as Invalid.

Please send your question instead to the community mailing list at mapreduce-user@hadoop.apache.org
- Providing source code in your mail will also help.
                
> null pointer exception and invocationtarget exception in jobtracker logs
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4038
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4038
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.20.1
>         Environment: Cluster with 10 nodes, Linux operating system
>            Reporter: gan
>            Priority: Critical
>              Labels: hadoop
>   Original Estimate: 276h
>  Remaining Estimate: 276h
>
> I have written the code for scheduling in hadoop in which i have written two function
schedule() and call() the schedule function calls the resource calculator for knowing the
CPU usage and reliability values(explicitly i gave) but i am getting null pointer exception
in the end. even i have written the code for getting active tracker names it shows null pointer
exception. help me!
> ERROR IN JOB TRACKER LOG FILE
> 2012-03-12 14:37:01,198 INFO org.apache.hadoop.mapred.JobTracker: STARTUP_MSG: 
> /************************************************************
> STARTUP_MSG: Starting JobTracker
> STARTUP_MSG:   host = slavenode2.yahoo/192.168.1.2
> STARTUP_MSG:   args = []
> STARTUP_MSG:   version = 0.20.1
> STARTUP_MSG:   build = http://svn.apache.org/repos/asf/hadoop/common/tags/release-0.20.1-rc1
-r 810220; compiled by 'oom' on Tue Sep  1 20:55:56 UTC 2009
> ************************************************************/
> 2012-03-12 14:37:01,451 INFO org.apache.hadoop.mapred.JobTracker: Scheduler configured
with (memSizeForMapSlotOnJT, memSizeForReduceSlotOnJT, limitMaxMemForMapTasks, limitMaxMemForReduceTasks)
(-1, -1, -1, -1)
> 2012-03-12 14:37:01,515 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.2
CPU usage: 0.0
> 2012-03-12 14:37:01,532 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.3
CPU usage: 0.0
> 2012-03-12 14:37:01,546 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.4
CPU usage: 0.0
> 2012-03-12 14:37:01,556 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.5
CPU usage: 0.0
> 2012-03-12 14:37:01,566 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.7
CPU usage: 0.0
> 2012-03-12 14:37:01,579 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.8
CPU usage: 0.0
> 2012-03-12 14:37:01,589 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.11
CPU usage: 0.0
> 2012-03-12 14:37:01,599 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.12
CPU usage: 0.0
> 2012-03-12 14:37:01,615 INFO org.apache.hadoop.mapred.resourcecalculator: 192.168.1.254
CPU usage: 0.0
> 2012-03-12 14:37:01,616 FATAL org.apache.hadoop.mapred.JobTracker: java.lang.RuntimeException:
java.lang.reflect.InvocationTargetException
> 	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:115)
> 	at org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:1573)
> 	at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:180)
> 	at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:172)
> 	at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:3699)
> Caused by: java.lang.reflect.InvocationTargetException
> 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> 	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> 	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:113)
> 	... 4 more
> Caused by: java.lang.NullPointerException
> 	at org.apache.hadoop.mapred.JobQueueTaskScheduler1.schedule(JobQueueTaskScheduler1.java:75)
> 	at org.apache.hadoop.mapred.JobQueueTaskScheduler1.call(JobQueueTaskScheduler1.java:139)
> 	at org.apache.hadoop.mapred.JobQueueTaskScheduler1.<init>(JobQueueTaskScheduler1.java:50)
> 	... 9 more
> 2012-03-12 14:37:01,617 INFO org.apache.hadoop.mapred.JobTracker: SHUTDOWN_MSG: 
> /************************************************************
> SHUTDOWN_MSG: Shutting down JobTracker at slavenode2.yahoo/192.168.1.2
> ************************************************************/

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