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From <deepak....@wipro.com>
Subject ERROR 6015: During execution, encountered a Hadoop error | ERROR 1066: Unable to open iterator for alias grouped_records
Date Mon, 13 Dec 2010 08:51:48 GMT

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.MapReduceLauncher
- 100% complete
2010-12-13 10:31:08,902 [main] ERROR org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
- 1 map reduce job(s) failed!
2010-12-13 10:31:08,911 [main] ERROR org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
- 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.MapReduceLauncher
- 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.getMapCompletionEvents(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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