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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CHUKWA-40) NPE in ChukwaJobTrackerInstrumentation.completeJob()
Date Thu, 19 Mar 2009 04:17:50 GMT

    [ https://issues.apache.org/jira/browse/CHUKWA-40?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683309#action_12683309
] 

Vinod K V commented on CHUKWA-40:
---------------------------------


I see a lot of these in the JobTracker's log as well as stdout, when ChukwaJobTrackerInstrumentation
is used for JT.
{code}
2009-03-19 04:08:57,252 WARN org.apache.hadoop.mapred.JobTrackerInstrumentation: could not
remove adaptor for this job: job_200903180931_1837
java.lang.NullPointerException
        at org.apache.hadoop.chukwa.datacollection.controller.ChukwaAgentController.remove(ChukwaAgentController.java:259)
        at org.apache.hadoop.mapred.ChukwaJobTrackerInstrumentation.completeJob(ChukwaJobTrackerInstrumentation.java:93)
        at org.apache.hadoop.mapred.JobInProgress.jobComplete(JobInProgress.java:2109)
        at org.apache.hadoop.mapred.JobInProgress.completedTask(JobInProgress.java:2050)
        at org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:867)
        at org.apache.hadoop.mapred.JobTracker.updateTaskStatuses(JobTracker.java:3252)
        at org.apache.hadoop.mapred.JobTracker.processHeartbeat(JobTracker.java:2553)
        at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:2348)
        at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
        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)
{code}

The instrumentation update arises out of JobTracker's heartbeat, but the hearbeat doesn't
seem to be affected as all Throwables are caught inside the method.
Don't know for sure if this exception causes some problems with metrics or even if this is
harmful.

> NPE in ChukwaJobTrackerInstrumentation.completeJob()
> ----------------------------------------------------
>
>                 Key: CHUKWA-40
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-40
>             Project: Hadoop Chukwa
>          Issue Type: Bug
>            Reporter: Vinod K V
>


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