Github user techaddict commented on the pull request:
https://github.com/apache/spark/pull/550#issuecomment-41388760
We'll need to specify the parameter types for function passed to reduceByKey
`reduceByKey((x: Long, y: Long) => x + y, 10)` instead of `reduceByKey(_ +
_, 10)`
For detailed discussion on compiler issue causing this,
https://groups.google.com/forum/#!topic/scala-user/Qhd3vJ2rAWM
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