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From Chen He <airb...@gmail.com>
Subject Re: meet a problem when using "pig -x tez_local"
Date Thu, 05 Jun 2014 20:34:38 GMT
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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