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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-338) TupleDeepCopier throws java.lang.ClassCastException: java.util.ArrayList cannot be cast to org.apache.avro.generic.IndexedRecord
Date Thu, 06 Feb 2014 23:51:19 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13894001#comment-13894001
] 

Josh Wills commented on CRUNCH-338:
-----------------------------------

Ack-- thanks Gabriel!

> TupleDeepCopier throws java.lang.ClassCastException: java.util.ArrayList cannot be cast
to org.apache.avro.generic.IndexedRecord
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CRUNCH-338
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-338
>             Project: Crunch
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.8.2
>            Reporter: Laxmikanth Samudrala
>            Assignee: Josh Wills
>         Attachments: CRUNCH-338.patch, ClassCastExceptionInDeepCopierIT.java, stack-trace.log
>
>
> when PTable<String, TupleN> using twice and performing parallelDo causing java.lang.ClassCastException;
when the same PTable<String, TupleN> used once for parallelDo not causing the exception
or turning PTable<String,TupleN> to PTable<String, Pair<Tuple4.Collect<?, ?,
?, ?>, Tuple3.Collect<?, ?, ?>>>  and using paired PTable twice for parallelDo
not causing any exception. 
> Note : The root cause seem's expressing the items passed to the TupleN is collection
or a single instance. Suprisingly when we are performing parallelDo operation once on PTable<String,
TupleN> is working with no exceptions and when performing parallelDo twice seem's try to
make use of TupleDeepCopier.deepCopy; which is triggering the exception.
> Template of Code :
> Failure case :
> PTable<String, TupleN> entityData = .....;
> entityData.parallelDo(.....);
> entityData.parallelDo(.....);
> Success Case :
> PTable<String, TupleN> entityData = .....;
> entityData.parallelDo(.....);
> Another success case :
> PTable<String, Pair<Tuple4.Collect<?, ?, ?, ?>, Tuple3.Collect<?, ?, ?>>>
entityData;
> entityData.parallelDo(.....);
> entityData.parallelDo(.....);
> stack trace for reference :
> org.apache.crunch.CrunchRuntimeException: Error while deep copying avro value [.........]
> 	at org.apache.crunch.types.avro.AvroDeepCopier.deepCopy(AvroDeepCopier.java:195)
> 	at org.apache.crunch.types.avro.AvroDeepCopier$AvroSpecificDeepCopier.deepCopy(AvroDeepCopier.java:83)
> 	at org.apache.crunch.types.avro.AvroType.getDetachedValue(AvroType.java:217)
> 	at org.apache.crunch.types.TupleDeepCopier.deepCopy(TupleDeepCopier.java:60)
> 	at org.apache.crunch.types.TupleDeepCopier.deepCopy(TupleDeepCopier.java:32)
> 	at org.apache.crunch.types.avro.AvroType.getDetachedValue(AvroType.java:217)
> 	at org.apache.crunch.lib.PTables.getDetachedValue(PTables.java:191)
> 	at org.apache.crunch.types.avro.AvroTableType.getDetachedValue(AvroTableType.java:149)
> 	at org.apache.crunch.types.avro.AvroTableType.getDetachedValue(AvroTableType.java:36)
> 	at org.apache.crunch.impl.mr.emit.IntermediateEmitter.emit(IntermediateEmitter.java:54)
> 	at org.apache.crunch.MapFn.process(MapFn.java:34)
> 	at org.apache.crunch.impl.mr.run.RTNode.process(RTNode.java:99)
> 	at org.apache.crunch.impl.mr.emit.IntermediateEmitter.emit(IntermediateEmitter.java:56)
> 	at org.apache.crunch.MapFn.process(MapFn.java:34)
> 	at org.apache.crunch.impl.mr.run.RTNode.process(RTNode.java:99)
> 	at org.apache.crunch.impl.mr.run.RTNode.processIterable(RTNode.java:114)
> 	at org.apache.crunch.impl.mr.run.CrunchReducer.reduce(CrunchReducer.java:57)
> 	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:164)
> 	at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:610)
> 	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:444)
> 	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:447)



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