apache/spark — pull request #3706 by davies (2014-12-15 22:46:28+00:00)
Title: [SPARK-4841] fix zip with textFile()

UTF8Deserializer can not be used in BatchedSerializer, so always use PickleSerializer() when change batchSize in zip().

Also, if two RDD have the same batch size already, they did not need re-serialize any more.