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From Hitesh Shah <hit...@apache.org>
Subject Re: meet a problem when using "pig -x tez_local"
Date Fri, 06 Jun 2014 01:49:17 GMT
@Chen, I am not sure asking for the user code to change is an option. We
should address the underlying issue which is fixing ObjectRegistry to work
in local mode.

thanks
-- Hitesh


On Thu, Jun 5, 2014 at 1:34 PM, Chen He <airbots@gmail.com> wrote:

> Hi Hitesh
>
> In my code, I did not touch any ObjectRegistry related code. I suspect the
> instantiation process of ObjectRegistry  has problem so that it failed to
> create an instance when it is called.
>
> I didn't know why PigProcessor collectSample vertex. But looks like it is
> not a must for TezLocalMode.
>
> Chen
>
>
> On Thu, Jun 5, 2014 at 2:59 PM, Chen He <airbots@gmail.com> wrote:
>
> > Hi Hitesh
> >
> > Yes, objectRegistry returns NPE. I saw it is a inject static variable.
> >
> > Regards!
> >
> > Chen
> >
> >
> > On Thu, Jun 5, 2014 at 9:15 AM, Hitesh Shah <hitesh@apache.org> wrote:
> >
> >> @Chen, this might be a bug in the tez local execution code. Can you
> >> confirm
> >> that ObjectRegistryFactory::getObjectRegistry returns a non-null value?
> >>
> >> thanks
> >> — Hitesh
> >>
> >>
> >> On Wed, Jun 4, 2014 at 4:21 PM, Chen He <airbots@gmail.com> wrote:
> >>
> >> > I am using pig -x tez_local to test tez local mode and met following
> >> > problems (use tutorial.jar)
> >> >
> >> > 2014-06-03 11:06:35,964 [pool-1-thread-1] INFO
> >> > org.apache.hadoop.mapred.YarnTezDagChild - Running task,
> >> > taskAttemptId=attempt_1401811588093_0000_1_05_000000_0
> >> > 2014-06-03 11:06:35,965 [pool-1-thread-1] ERROR
> >> > org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor -
> >> > Encountered exception while processing:
> >> > java.lang.NullPointerException
> >> >         at
> >> >
> >> >
> >>
> org.apache.pig.backend.hadoop.executionengine.tez.ObjectCache.retrieve(ObjectCache.java:47)
> >> >         at
> >> >
> >> >
> >>
> org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.collectSample(PigProcessor.java:307)
> >> >         at
> >> >
> >> >
> >>
> org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.initializeInputs(PigProcessor.java:218)
> >> >         at
> >> >
> >> >
> >>
> org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.run(PigProcessor.java:162)
> >> >         at
> >> >
> >> >
> >>
> org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:317)
> >> >         at
> >> >
> org.apache.hadoop.mapred.YarnTezDagChild$3.run(YarnTezDagChild.java:602)
> >> >         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:1491)
> >> >         at
> >> >
> >>
> org.apache.hadoop.mapred.YarnTezDagChild.pollTask(YarnTezDagChild.java:591)
> >> >         at
> >> >
> >>
> org.apache.hadoop.mapred.YarnTezDagChild.runTask(YarnTezDagChild.java:332)
> >> >         at
> >> >
> >> >
> >>
> org.apache.tez.dag.app.launcher.LocalContainerLauncher$1.run(LocalContainerLauncher.java:250)
> >> >         at java.lang.Thread.run(Thread.java:744)
> >> >         at
> >> >
> >> >
> >>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> >> >         at
> >> >
> >> >
> >>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> >> >         at java.lang.Thread.run(Thread.java:744)
> >> >
> >> > code checking implies that the ObjectCache is trying to get something
> >> from
> >> > a Map but it is not there.
> >> > But what is the purpose of using ObjectCache in PIG on TEZ?
> >> > Why pig needs sampleVertex in the PigProcessor?
> >> >
> >> > Any reply will be appreciated.
> >> >
> >> > Regards!
> >> >
> >> > Chen
> >> >
> >>
> >
> >
>

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