Another possible reason, if namenode is in safemode, this error happens.
Thanks -- Prasanth On Aug 29, 2012, at 2:47 AM, Dmitriy Ryaboy <[email protected]> wrote: > 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 >> ~
