Github user koeninger commented on the pull request:
https://github.com/apache/spark/pull/8133#issuecomment-131859733
KafkaRDD attempts to instantiate the value decoder right before connecting
the consumer:
val valueDecoder = classTag[T].runtimeClass.getConstructor(classOf[
VerifiableProperties])
.newInstance(kc.config.props)
.asInstanceOf[Decoder[V]]
val consumer = connectLeader
Something's wrong with your SwipeDecoder
On Mon, Aug 17, 2015 at 3:16 AM, Shyam S Kumar <[email protected]>
wrote:
> I get the same NPE issue in Spark 1.4.1 also. I'm not sure what's wrong
> (yet) as my spark streaming job was running fine printing out Array[Byte]
> data, but after I added a custom decoder (Avro to my class Swipe) it
> keeps spitting the NPE error (consumer is null). Any hints on what could
> be the root cause?
>
> val swipes = KafkaUtils.createDirectStream[Array[Byte], Array[Byte],
> DefaultDecoder, DefaultDecoder](ssc, kafkaParams, topics) works, but
> val swipes = KafkaUtils.createDirectStream[Array[Byte], Swipe,
> DefaultDecoder, SwipeDecoder](ssc, kafkaParams, topics) doesn't. In that
> aspect the NPE is sorta misleading (maybe).
>
> â
> Reply to this email directly or view it on GitHub
> <https://github.com/apache/spark/pull/8133#issuecomment-131740417>.
>
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