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