Github user techaddict commented on the pull request:
https://github.com/apache/spark/pull/589#issuecomment-41704140
While using these methods we have to specify the parameter type for the
reduceFunc.
https://github.com/apache/spark/blob/master/streaming/src/main/scala/org/apache/spark/streaming/dstream/PairDStreamFunctions.scala#L295
https://github.com/apache/spark/blob/master/streaming/src/main/scala/org/apache/spark/streaming/dstream/PairDStreamFunctions.scala#L221
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