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Pig, mail # user - Support for Hadoop 2.2


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Re: Support for Hadoop 2.2
Claudio Romo Otto 2013-10-30, 22:40
Jarcec, finally I got solved this problem by learning more on hadoop 2
(lot of reading), and then tuning some settings to let the work move
from the SCHEDULED state. With this said, the last problem was only
concerning on hadoop.

Thanks for your support!

El 30/10/13 18:03, Jarek Jarcec Cecho escribi�:
> Hi Claudio,
> it's hard to guess from the limited information. I would suggest to take a look into logs to see what is happening.
>
> One guess though - You've mentioned that the task was "running" for 30 minutes, but it still seems to be in SCHEDULED time - are your node managers correctly running?
>
> Jarcec
>
> On Fri, Oct 25, 2013 at 04:10:12PM -0300, Claudio Romo Otto wrote:
>> You got it!
>>
>> The solution was to compile with  -Dhadoopversion=23 option. After
>> your message I tried another test removing Cassandra from the chain
>> and Pig sent successfully the job to hadoop.
>>
>> BUT! the problem changed, now the Map task remains forever stuck on
>> Hadoop (30 minutes waiting, no other jobs running):
>>
>> Task
>>
>> Progress
>>
>> State
>>
>> Start Time
>>
>> Finish Time
>>
>> Elapsed Time
>> task_1382631533263_0012_m_000000 <http://topgps-test-3.dnsalias.com:8088/proxy/application_1382631533263_0012/mapreduce/task/task_1382631533263_0012_m_000000>
>>
>> SCHEDULED Fri, 25 Oct 2013 18:18:32 GMT N/A 0sec
>>
>>
>>
>> Attempt
>>
>> Progress
>>
>> State
>>
>> Node
>>
>> Logs
>>
>> Started
>>
>> Finished
>>
>> Elapsed
>>
>> Note
>> attempt_1382631533263_0012_m_000000_0 0,00 STARTING N/A N/A N/A
>> N/A 0sec
>>
>>
>> Don't know if this is a Hadoop problem or Pig, what do you think?
>>
>>
>> El 25/10/13 13:11, Jarek Jarcec Cecho escribi�:
>>> It seems that Pig was correctly compiled against Hadoop 23, but the Cassandra piece was not, check out the where the exception is coming from:
>>>
>>>> Caused by: java.lang.IncompatibleClassChangeError: Found interface
>>>> org.apache.hadoop.mapreduce.JobContext, but class was expected
>>>>      at org.apache.cassandra.hadoop.AbstractColumnFamilyInputFormat.getSplits(AbstractColumnFamilyInputFormat.java:113)
>>> So, I would say that you also need to get Hadoop 2 compatible Cassandra connector first.
>>>
>>> Jarcec
>>>
>>> On Thu, Oct 24, 2013 at 10:34:49PM -0300, Claudio Romo Otto wrote:
>>>> After change from hadoop20 to hadoop23 the warning dissapeared but I
>>>> got the same exception (Found interface
>>>> org.apache.hadoop.mapreduce.JobContext, but class was expected)
>>>>
>>>> I have tried over a fresh install: hadoop 2.2.0 and pig 0.12.1
>>>> compiled by me, no other product nor configuration, just two
>>>> servers, one master with ResourceManager and NameNode, one slave
>>>> with DataNode and NodeManager.
>>>>
>>>> I can't understand why over this fresh cluster Pig 0.12 fails. Here
>>>> is the new trace:
>>>>
>>>> 2013-10-24 16:10:52,351 [JobControl] ERROR
>>>> org.apache.pig.backend.hadoop23.PigJobControl - Error while trying
>>>> to run jobs.
>>>> java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
>>>>      at org.apache.pig.backend.hadoop23.PigJobControl.submit(PigJobControl.java:130)
>>>>      at org.apache.pig.backend.hadoop23.PigJobControl.run(PigJobControl.java:191)
>>>>      at java.lang.Thread.run(Thread.java:724)
>>>>      at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher$1.run(MapReduceLauncher.java:257)
>>>> Caused by: java.lang.reflect.InvocationTargetException
>>>>      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>>      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>>>>      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>>>      at java.lang.reflect.Method.invoke(Method.java:606)
>>>>      at org.apache.pig.backend.hadoop23.PigJobControl.submit(PigJobControl.java:128)
>>>>      ... 3 more
>>>> Caused by: java.lang.IncompatibleClassChangeError: Found interface
>>>> org.apache.hadoop.mapreduce.JobContext, but class was expected