Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/1751#issuecomment-51282121
I dont think that is the problem. The real problem is how SBT and Maven
resolves multiple versions of the same library, which in this case, is
Zookeeper. Observing and comparing the dependency trees from Maven and SBT
showed this. Spark depends on ZK 3.4.5 whereas Apache Kafka transitively
depends on upon ZK 3.3.4. SBT decides to evict 3.3.4 and use the higher version
3.4.5. But Maven decides to stick to the closest (in the tree) dependent
version of 3.3.4. And 3.3.4 does not have
[NIOServerCnxnFactory](http://grepcode.com/search?query=NIOServerCnxnFactory&n=).
The solution is probably to exclude zookeeper from the apache-kafka
dependency in streaming-kafka module so that it just inherits zookeeper from
Spark core.
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