pig-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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
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?

Please do not print this email unless it is absolutely necessary. 

The information contained in this electronic message and any attachments to this message are
intended for the exclusive use of the addressee(s) and may contain proprietary, confidential
or privileged information. If you are not the intended recipient, you should not disseminate,
distribute or copy this e-mail. Please notify the sender immediately and destroy all copies
of this message and any attachments. 

WARNING: Computer viruses can be transmitted via email. The recipient should check this email
and any attachments for the presence of viruses. The company accepts no liability for any
damage caused by any virus transmitted by this email. 

www.wipro.com

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message