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.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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