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https://issues.apache.org/jira/browse/KAFKA-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14997993#comment-14997993
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ASF GitHub Bot commented on KAFKA-2793:
---------------------------------------
GitHub user ewencp opened a pull request:
https://github.com/apache/kafka/pull/482
KAFKA-2793: Use ByteArrayDeserializer instead of StringDeserializer for
keys in ConsoleConsumer with new consumer.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ewencp/kafka
kafka-2793-console-consumer-new-consumer-deserializer
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/482.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #482
----
commit b437ffa341ff9e1c8e39b74d64ba9a51785172bc
Author: Ewen Cheslack-Postava <m...@ewencp.org>
Date: 2015-11-10T05:44:00Z
KAFKA-2793: Use ByteArrayDeserializer instead of StringDeserializer for
keys in ConsoleConsumer with new consumer.
----
> ConsoleConsumer crashes with new consumer when using keys because of
> incorrect deserializer
> -------------------------------------------------------------------------------------------
>
> Key: KAFKA-2793
> URL: https://issues.apache.org/jira/browse/KAFKA-2793
> Project: Kafka
> Issue Type: Bug
> Components: tools
> Reporter: Ewen Cheslack-Postava
> Assignee: Ewen Cheslack-Postava
>
> The ConsoleConsumer class uses Array[Byte] everywhere, but the new consumer
> is configured with a string key deserializer, resulting in a class cast
> exception:
> {quote}
> java.lang.ClassCastException: java.lang.String cannot be cast to [B
> at kafka.consumer.NewShinyConsumer.receive(BaseConsumer.scala:62)
> at kafka.tools.ConsoleConsumer$.process(ConsoleConsumer.scala:101)
> at kafka.tools.ConsoleConsumer$.run(ConsoleConsumer.scala:64)
> at kafka.tools.ConsoleConsumer$.main(ConsoleConsumer.scala:42)
> at kafka.tools.ConsoleConsumer.main(ConsoleConsumer.scala)
> {quote}
> Note that this is an issue whether you are printing the keys or not, it will
> be triggered by any non-null key (and I'd imagine some should also trigger
> serialization exceptions if they are not UTF8-decodeable).
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