I'm having the same problem with Spark 1.0.0. I got the " JavaKafkaWordCount.java" example working on my workstation running Spark locally after doing a build, but when I tried to get the example running on YARN, I got the same error. I used the "uber jar" that was created during the build process for the examples, and I confirmed that "org/I0Itec/zkclient/serialize/ZkSerializer" is in the uber jar.
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