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From <deepak....@wipro.com>
Subject RE: ERROR 6015: During execution, encountered a Hadoop error | ERROR 1066: Unable to open iterator for alias grouped_records
Date Mon, 13 Dec 2010 13:11:21 GMT
My Script:

records = LOAD 'hdfs://hadoop.namenode:54310/data' USING PigStorage(',')
AS (Year:int, Month:int,DayofMonth:int,DayofWeek:int);
grouped_records = GROUP records BY Month;
DUMP grouped_records; 

Hadoop Version: 0.20.2
Pig Version: 0.7.0

I couldn't find the reduce task logs. Where are they generated?

Surprisingly, PIG jobs donot seem to generate any Hadoop (namenode, datanode, tasktracker
etc) logs.


-----Original Message-----
From: Dmitriy Ryaboy [mailto:dvryaboy@gmail.com] 
Sent: Monday, December 13, 2010 4:51 PM
To: user@pig.apache.org
Subject: Re: ERROR 6015: During execution, encountered a Hadoop error | ERROR 1066: Unable
to open iterator for alias grouped_records

Can you send along your script and the reduce task logs?
What version of Pig and Hadoop are you using?

Thanks,
-Dmitriy

On Sun, Dec 12, 2010 at 10:36 PM, <deepak.n85@wipro.com> wrote:

> Hi,
>
> I loaded a csv file with about 10 fields into PigStorage and tried to 
> do a GROUP BY on one of the fields. The MapReduce job gets created, 
> and the Mappers finish execution.
>
> But after that, the job fails with the following error messages:
>
> 2010-12-13 10:31:08,902 [main] INFO
>  
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduce
> Launcher
> - 100% complete
> 2010-12-13 10:31:08,902 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduce
> Launcher
> - 1 map reduce job(s) failed!
> 2010-12-13 10:31:08,911 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduce
> Launcher
> - Failed to produce result in:
> "hdfs://hadoop.namenode:54310/tmp/temp2041073534/tmp-2060206542"
> 2010-12-13 10:31:08,911 [main] INFO
>  
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduce
> Launcher
> - Failed!
> 2010-12-13 10:31:08,961 [main] ERROR org.apache.pig.tools.grunt.Grunt 
> - ERROR 6015: During execution, encountered a Hadoop error.
> 2010-12-13 10:31:08,961 [main] ERROR org.apache.pig.tools.grunt.Grunt 
> -
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable 
> to open iterator for alias grouped_records
>        at org.apache.pig.PigServer.openIterator(PigServer.java:521)
>        at
> org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:544)
>        at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:241)
>        at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:162)
>        at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:138)
>        at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:75)
>        at org.apache.pig.Main.main(Main.java:357)
> Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR
> 6015: During execution, encountered a Hadoop error.
>        at
> .util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
>        at
> .apache.hadoop.mapred.ReduceTask(ReduceCopier$GetMapEventsThread.getMa
> pCompletionEvents(ReduceTask.java:2683)
> Caused by: java.lang.NullPointerException
>        ... 2 more
>
> The filter statements (Mapper only) work properly, so it's not that 
> nothing is running.
>
> What's the issue here?
>
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