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我想联盟2个Dstreams:转换DSTREAM [java.util.Date]到DSTREAM [字符串]
val statuses = tweets.map(status => status.getText())
val users = tweets.map(status => status.getUser())
val Dates = tweets.map(status => status.getCreatedAt())
(statuses. union(Dates)).print
但我发现了一个错误,存在类型不匹配:
Found: org.apache.spark.streaming.dstream.DStream[java.util.Date]
Required: org.apache.spark.streaming.dstream.DStream[String]
我该如何做转换?
可能重复(http://stackoverflow.com/questions/5683728 /转换-Java的util的最新到字符串) – 2015-04-03 04:01:33