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Pig >> mail # user >> Unable to open iterator


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Unable to open iterator
I have this simple pig script but when I run I get:

2012-08-28 17:50:24,924 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
- Failed!
2012-08-28 17:50:24,939 [main] ERROR org.apache.pig.tools.grunt.Grunt -
ERROR 1066: Unable to open iterator for alias C

DEFINE SequenceFileLoader
org.apache.pig.piggybank.storage.SequenceFileLoader();
A = LOAD '/flume_vol/flume/2012/08/24/13/dslg1/*.snappy' USING
SequenceFileLoader AS (key:long, document:bytearray);
B = GROUP A BY key;
C = foreach B generate COUNT(A);
dump C;
I do see data in the files:

 hadoop fs -cat
/flume_vol/flume/2012/08/24/13/dslg1/web.1345840674870.snappy|more
SEQ!org.apache.hadoop.io.LongWritable"org.apache.hadoop.io.BytesWritable)org.apache.hadoop.io.compress.SnappyCodec
~
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB