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From "ey-chih chow (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AVRO-792) map reduce job for avro 1.5 generates ArrayIndexOutOfBoundsException
Date Wed, 30 Mar 2011 21:55:05 GMT
map reduce job for avro 1.5 generates ArrayIndexOutOfBoundsException
--------------------------------------------------------------------

                 Key: AVRO-792
                 URL: https://issues.apache.org/jira/browse/AVRO-792
             Project: Avro
          Issue Type: Bug
          Components: java
    Affects Versions: 1.5.0
         Environment: Mac with VMWare running Linux training-vm-Ubuntu
            Reporter: ey-chih chow


We have an avro map/reduce job used to be working with avro 1.4, but broken with avro 1.5.
 The M/R job with avro 1.5 worked fine under our debugging environment, but broken when we
moved to a real cluster.  At one instance f testing, the job had 23 reducers.  Four of them
succeeded and the rest failed because of the ArrayIndexOutOfBoundsException generated.  Here
are two instances of the stack traces:

=================================================================================
java.lang.ArrayIndexOutOfBoundsException: -1576799025
	at org.apache.avro.io.parsing.Symbol$Alternative.getSymbol(Symbol.java:364)
	at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:229)
	at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
	at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:206)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
	at org.apache.avro.generic.GenericDatumReader.readMap(GenericDatumReader.java:232)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:141)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
	at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:166)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:138)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:129)
	at org.apache.avro.mapred.AvroSerialization$AvroWrapperDeserializer.deserialize(AvroSerialization.java:86)
	at org.apache.avro.mapred.AvroSerialization$AvroWrapperDeserializer.deserialize(AvroSerialization.java:68)
	at org.apache.hadoop.mapred.Task$ValuesIterator.readNextValue(Task.java:1136)
	at org.apache.hadoop.mapred.Task$ValuesIterator.next(Task.java:1076)
	at org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.moveToNext(ReduceTask.java:246)
	at org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.next(ReduceTask.java:242)
	at org.apache.avro.mapred.HadoopReducerBase$ReduceIterable.next(HadoopReducerBase.java:47)
	at com.ngmoco.ngpipes.etl.NgEventETLReducer.reduce(NgEventETLReducer.java:46)
	at com.ngmoco.ngpipes.etl.NgEventETLReducer.reduce(NgEventETLReducer.java:1)
	at org.apache.avro.mapred.HadoopReducerBase.reduce(HadoopReducerBase.java:60)
	at org.apache.avro.mapred.HadoopReducerBase.reduce(HadoopReducerBase.java:30)
	at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:468)
	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:416)
	at org.apache.hadoop.mapred.Child$4.run(Child.java:240)
	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:1115)
	at org.apache.hadoop.mapred.Child.main(Child.java:234)

=====================================================================================================

java.lang.ArrayIndexOutOfBoundsException: 40
	at org.apache.avro.io.parsing.Symbol$Alternative.getSymbol(Symbol.java:364)
	at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:229)
	at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
	at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:206)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
	at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:166)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:138)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:129)
	at org.apache.avro.mapred.AvroSerialization$AvroWrapperDeserializer.deserialize(AvroSerialization.java:86)
	at org.apache.avro.mapred.AvroSerialization$AvroWrapperDeserializer.deserialize(AvroSerialization.java:68)
	at org.apache.hadoop.mapred.Task$ValuesIterator.readNextValue(Task.java:1136)
	at org.apache.hadoop.mapred.Task$ValuesIterator.next(Task.java:1076)
	at org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.moveToNext(ReduceTask.java:246)
	at org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.next(ReduceTask.java:242)
	at org.apache.avro.mapred.HadoopReducerBase$ReduceIterable.next(HadoopReducerBase.java:47)
	at com.ngmoco.ngpipes.sourcing.sessions.NgSessionReducer.reduce(NgSessionReducer.java:74)
	at com.ngmoco.ngpipes.sourcing.sessions.NgSessionReducer.reduce(NgSessionReducer.java:1)
	at org.apache.avro.mapred.HadoopReducerBase.reduce(HadoopReducerBase.java:60)
	at org.apache.avro.mapred.HadoopReducerBase.reduce(HadoopReducerBase.java:30)
	at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:468)
	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:416)
	at org.apache.hadoop.mapred.Child$4.run(Child.java:240)
	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:1115)
	at org.apache.hadoop.mapred.Child.main(Child.java:234)
=====================================================================================================

The signature of our map() is:

public void map(Utf8 input, AvroCollector<Pair<Utf8, GenericRecord>> collector,
Reporter reporter) throws IOException;

and reduce() is:

public void reduce(Utf8 key, Iterable<GenericRecord> values, AvroCollector<GenericRecord>
collector, Reporter reporter) throws IOException;

All the GenericRecords are of the same schema.

There are many changes in the area of serialization/de-serailization between avro 1.4 and
1.5, but could not figure out why the exceptions were generated. 

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