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Kafka, mail # user - Hadoop example running DataGenerator causes kafka.message.Message cannot be cast to [B exception


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Andrew Milkowski 2013-05-30, 20:47
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Jun Rao 2013-05-31, 03:51
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Andrew Milkowski 2013-06-05, 16:38
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Re: Hadoop example running DataGenerator causes kafka.message.Message cannot be cast to [B exception
Jun Rao 2013-06-06, 03:58
Thanks, could you attach your patch to the jira?

Jun
On Wed, Jun 5, 2013 at 9:37 AM, Andrew Milkowski <[EMAIL PROTECTED]> wrote:

> Jun, thanks for the response
>
> 1. new jira https://issues.apache.org/jira/browse/KAFKA-933
> 2. locally I patched DataGenerator
>
> public void run() throws Exception {
>
> List<KeyedMessage<Integer, String>> list = new
> ArrayList<KeyedMessage<Integer, String>>();
> for (int i = 0; i < 50; i++) {
> Long timestamp = RANDOM.nextLong();
> if (timestamp < 0) timestamp = -timestamp;
> String messageStr = timestamp.toString();
> log.info(" creating message: " + messageStr);
> list.add(new KeyedMessage<Integer, String>(topic, null, messageStr));
> }
>
> log.info(" send " + list.size() + " " + topic + " count events to " +
> uri);
> producer.send(list);
> producer.close();
>  generateOffsets();
> }
>
> I have a separate request, having to do with upgrading kafka hadoop api's,
> will follow up in the separte email to @users
>
> thanks!
>
>
> On Thu, May 30, 2013 at 11:50 PM, Jun Rao <[EMAIL PROTECTED]> wrote:
>
> > This seems to be a bug. We should send the message string, instead the
> > Message object in DataGenerator. Could you file a jira?
> >
> > Thanks,
> >
> > Jun
> >
> >
> > On Thu, May 30, 2013 at 1:47 PM, Andrew Milkowski <[EMAIL PROTECTED]
> > >wrote:
> >
> > > Hi,
> > >
> > > 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)
> > >
> > > please advice, thank you!
> > >
> >
>