StoreFunc should work with OutputFormat<ComparableWritable,Writable>
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Key: PIG-2367
URL: https://issues.apache.org/jira/browse/PIG-2367
Project: Pig
Issue Type: Bug
Reporter: Gianmarco De Francisci Morales
Right now, if one wants to write a SequenceFile from a custom StoreFunc he
needs to declare it to be a OutputFormat<NullableText, NullableTuple>
Otherwise you get these exceptions:
{code}
ERROR org.apache.pig.tools.grunt.GruntParser -
ERROR 2997: Unable to recreate exception from backed error:
java.io.IOException: java.io.IOException: wrong key class:
org.apache.hadoop.io.NullWritable is not class
org.apache.pig.impl.io.NullableText
ERROR org.apache.pig.tools.grunt.GruntParser -
ERROR 2997: Unable to recreate exception from backed error:
java.io.IOException: java.io.IOException: wrong value class:
org.apache.hadoop.io.BytesWritable is not class
org.apache.pig.impl.io.NullableTuple
{code}
And stack trace:
{code}
java.io.IOException: java.io.IOException: wrong key class:
org.apache.hadoop.io.NullWritable is not class org.apache.pig.impl.io.
NullableText
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:464)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:427)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:399)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:261)
at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
at
org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:649)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:417)
at org.apache.hadoop.mapred.Child$4.run(Child.java:261)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
at org.apache.hadoop.mapred.Child.main(Child.java:255)
Caused by: java.io.IOException: wrong key class:
org.apache.hadoop.io.NullWritable is not class
org.apache.pig.impl.io.NullableText
at
org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:985)
at
org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat$1.write(SequenceFileOutputFormat.java:74)
at mypackage.pig.BinStorage.putNext(BinStorage.java:75)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:139)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:98)
at
org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:587)
at
org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:462)
... 11 more
{code}
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