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From "Micah Whitacre (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-363) Cogroup using Protobufs with WritableTypeFamily throws Proto Exception
Date Wed, 12 Mar 2014 21:14:43 GMT
Micah Whitacre created CRUNCH-363:
-------------------------------------

             Summary: Cogroup using Protobufs with WritableTypeFamily throws Proto Exception
                 Key: CRUNCH-363
                 URL: https://issues.apache.org/jira/browse/CRUNCH-363
             Project: Crunch
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.8.2
            Reporter: Micah Whitacre
            Assignee: Josh Wills


If you have code like the following:

{code}
PTable<String, Proto> t1 = ...
PTable<String, Proto> t2 = ...
ti.cogroup(t2);
{code}

Where the PType of each table was created using:
ptf.tableOf(ptf.strings(), PTypes.protos(Person.class, ptf));

and "ptf" is an instance of WritableTypeFamily.

You will get an exception like the following.

{quote}
org.apache.crunch.CrunchRuntimeException: com.google.protobuf.InvalidProtocolBufferException:
Protocol message contained an invalid tag (zero).
	at org.apache.crunch.types.PTypes$ProtoInputMapFn.map(PTypes.java:191)
	at org.apache.crunch.types.PTypes$ProtoInputMapFn.map(PTypes.java:160)
	at org.apache.crunch.fn.CompositeMapFn.map(CompositeMapFn.java:63)
	at org.apache.crunch.types.writable.Writables$UWInputFn.map(Writables.java:611)
	at org.apache.crunch.types.writable.Writables$UWInputFn.map(Writables.java:573)
	at org.apache.crunch.types.PGroupedTableType$HoldLastIterator.next(PGroupedTableType.java:84)
	at org.apache.crunch.lib.Cogroup$PostGroupFn.map(Cogroup.java:275)
	at org.apache.crunch.lib.Cogroup$PostGroupFn.map(Cogroup.java:250)
	at org.apache.crunch.fn.PairMapFn.map(PairMapFn.java:62)
	at org.apache.crunch.fn.PairMapFn.map(PairMapFn.java:26)
	at org.apache.crunch.MapFn.process(MapFn.java:34)
	at org.apache.crunch.impl.mr.run.RTNode.process(RTNode.java:98)
	at org.apache.crunch.impl.mr.emit.IntermediateEmitter.emit(IntermediateEmitter.java:56)
	at org.apache.crunch.MapFn.process(MapFn.java:34)
	at org.apache.crunch.impl.mr.run.RTNode.process(RTNode.java:98)
	at org.apache.crunch.impl.mr.run.RTNode.processIterable(RTNode.java:113)
	at org.apache.crunch.impl.mr.run.CrunchReducer.reduce(CrunchReducer.java:57)
	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
	at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:650)
	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:418)
	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:262)
Caused by: com.google.protobuf.InvalidProtocolBufferException: Protocol message contained
an invalid tag (zero).
	at com.google.protobuf.InvalidProtocolBufferException.invalidTag(InvalidProtocolBufferException.java:89)
	at com.google.protobuf.CodedInputStream.readTag(CodedInputStream.java:108)
	at org.apache.crunch.lib.PersonProtos$Person.<init>(PersonProtos.java:101)
	at org.apache.crunch.lib.PersonProtos$Person.<init>(PersonProtos.java:65)
	at org.apache.crunch.lib.PersonProtos$Person$1.parsePartialFrom(PersonProtos.java:153)
	at org.apache.crunch.lib.PersonProtos$Person$1.parsePartialFrom(PersonProtos.java:148)
	at org.apache.crunch.lib.PersonProtos$Person$Builder.mergeFrom(PersonProtos.java:484)
	at org.apache.crunch.lib.PersonProtos$Person$Builder.mergeFrom(PersonProtos.java:369)
	at com.google.protobuf.AbstractMessageLite$Builder.mergeFrom(AbstractMessageLite.java:196)
	at com.google.protobuf.AbstractMessage$Builder.mergeFrom(AbstractMessage.java:898)
	at com.google.protobuf.AbstractMessage$Builder.mergeFrom(AbstractMessage.java:267)
	at org.apache.crunch.types.PTypes$ProtoInputMapFn.map(PTypes.java:189)
	... 20 more
{quote}

Note you don't get the same exception for AvroTypeFamily.



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