Please take a look at your job tracker page. It will have a failed job, which will have failed tasks, which will have more detailed error logs.
On Aug 28, 2012, at 5:52 PM, Mohit Anchlia <[email protected]> wrote: > 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 > ~
