[CASSANDRA-2954] Lack of conversion from Cassandra's TimeUUIDType to any compatible type in Pig.

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Duplicate
• Fix Version/s: 0.8.5
• Severity: Low
• Assignee: Unassigned
• Reporter: Jacek Gerbszt
• Created: 27/Jul/11 11:55
• Updated: 16/Apr/19 09:32
• Resolved: 24/Aug/11 16:58

Description

CassandraStorage passes wrong data types to pig. When I try to access column family with comparator=TimeUUIDType, I get an exception:
java.lang.RuntimeException: Unexpected data type -1 found in stream.
at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:478)
at org.apache.pig.data.BinInterSedes.writeTuple(BinInterSedes.java:541)
at org.apache.pig.data.BinInterSedes.writeBag(BinInterSedes.java:522)
at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:361)
at org.apache.pig.data.BinInterSedes.writeTuple(BinInterSedes.java:541)
at org.apache.pig.data.BinInterSedes.writeDatum(BinInterSedes.java:357)
at org.apache.pig.impl.io.InterRecordWriter.write(InterRecordWriter.java:73)
at org.apache.pig.impl.io.InterStorage.putNext(InterStorage.java:87)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:138)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:97)
at org.apache.hadoop.mapred.MapTask$NewDirectOutputCollector.write(MapTask.java:531)
at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map.collect(PigMapOnly.java:48)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:239)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:232)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:53)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:647)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:323)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:210)

The reason is that CassandraStorage converts TimeUUIDType to UUID using org.apache.cassandra.db.marshal.TimeUUIDType and puts it in a Pig's Tuple:
CassandraStorage.java:148: pair.set(0, marshallers.get(0).compose(name));

Pig cannot handle UUID, so throws an exception.
There's a need for some mechanizm to convert Cassadra types to Pig types, because probably this isn't a single case.