ERROR — [ main] org.apache.spark.streaming.StreamingContext (line: 94) : Error starting the context, marking it as stopped
java.lang.IllegalArgumentException: requirement failed: No output operations registered, so nothing to execute
at scala.Predef$.require(Predef.scala:281)
at org.apache.spark.streaming.DStreamGraph.validate(DStreamGraph.scala:169)
at org.apache.spark.streaming.StreamingContext.validate(StreamingContext.scala:518)
at org.apache.spark.streaming.StreamingContext.liftedTree1
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1(StreamingContext.scala:578) at org.apache.spark.streaming.StreamingContext.start(StreamingContext.scala:577) at com.ss.app.SaleDetailApp
1(StreamingContext.scala:578)atorg.apache.spark.streaming.StreamingContext.start(StreamingContext.scala:577)atcom.ss.app.SaleDetailApp.main(SaleDetailApp.scala:58)
at com.ss.app.SaleDetailApp.main(SaleDetailApp.scala)
Exception in thread “main” java.lang.IllegalArgumentException: requirement failed: No output operations registered, so nothing to execute
at scala.Predef$.require(Predef.scala:281)
at org.apache.spark.streaming.DStreamGraph.validate(DStreamGraph.scala:169)
at org.apache.spark.streaming.StreamingContext.validate(StreamingContext.scala:518)
at org.apache.spark.streaming.StreamingContext.liftedTree1
1
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1(StreamingContext.scala:578) at org.apache.spark.streaming.StreamingContext.start(StreamingContext.scala:577) at com.ss.app.SaleDetailApp
1(StreamingContext.scala:578)atorg.apache.spark.streaming.StreamingContext.start(StreamingContext.scala:577)atcom.ss.app.SaleDetailApp.main(SaleDetailApp.scala:58)
at com.ss.app.SaleDetailApp.main(SaleDetailApp.scala)
解决方法：
DStream只有转换原语，无输出原语
添加任意的输出原语即可，如print() foreachRDD(func)
