[KAFKA-933] Hadoop example running DataGenerator causes kafka.message.Message cannot be cast to [B exception

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.1
• Component/s: contrib
• Labels: hadoop

Environment

[amilkowski@localhost ~]$ uname -a
Linux localhost.localdomain 3.9.4-200.fc18.x86_64 #1 SMP Fri May 24 20:10:49 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
[amilkowski@localhost ~]$

• Assignee: Unassigned
• Reporter: Andrew Milkowski
• Created: 05/Jun/13 16:33
• Updated: 22/Nov/13 05:37
• Resolved: 22/Nov/13 05:37

Description

Working of git master codebase

and following instructions at

https://github.com/apache/kafka/blob/trunk/contrib/hadoop-consumer/README

https://github.com/apache/kafka

when running

./run-class.sh kafka.etl.impl.DataGenerator test/test.properties

an exception is thrown

Exception in thread "main" java.lang.ClassCastException: kafka.message.Message cannot be cast to [B
at kafka.serializer.DefaultEncoder.toBytes(Encoder.scala:34)
at kafka.producer.async.DefaultEventHandler$$anonfun$serialize$1.apply(DefaultEventHandler.scala:129)
at kafka.producer.async.DefaultEventHandler$$anonfun$serialize$1.apply(DefaultEventHandler.scala:124)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:233)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:233)
at scala.collection.Iterator$class.foreach(Iterator.scala:772)
at scala.collection.JavaConversions$JIteratorWrapper.foreach(JavaConversions.scala:573)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:73)
at scala.collection.JavaConversions$JListWrapper.foreach(JavaConversions.scala:615)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:233)
at scala.collection.JavaConversions$JListWrapper.map(JavaConversions.scala:615)
at kafka.producer.async.DefaultEventHandler.serialize(DefaultEventHandler.scala:124)
at kafka.producer.async.DefaultEventHandler.handle(DefaultEventHandler.scala:54)
at kafka.producer.Producer.send(Producer.scala:74)
at kafka.javaapi.producer.Producer.send(Producer.scala:41)