org.apache.spark.streaming.dstream.MappedDStream@5a69b104 has not been initialized

现象

执行Spark Streaming Application时报错

15/07/09 11:26:55 INFO scheduler.JobGenerator: Stopping JobGenerator immediately
15/07/09 11:26:55 INFO util.RecurringTimer: Stopped timer for JobGenerator after time -1
15/07/09 11:26:55 INFO streaming.CheckpointWriter: CheckpointWriter executor terminated ? true, waited for 0 ms.
15/07/09 11:26:55 INFO scheduler.JobGenerator: Stopped JobGenerator
15/07/09 11:26:55 INFO scheduler.JobScheduler: Stopped JobScheduler
Exception in thread "main" org.apache.spark.SparkException: org.apache.spark.streaming.dstream.MappedDStream@5a69b104 has not been initialized
    at org.apache.spark.streaming.dstream.DStream.isTimeValid(DStream.scala:321)
    at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:342)
    at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:342)
    at scala.Option.orElse(Option.scala:257)
    at org.apache.spark.streaming.dstream.DStream.getOrCompute(DStream.scala:339)
    at org.apache.spark.streaming.dstream.ForEachDStream.generateJob(ForEachDStream.scala:38)
    at org.apache.spark.streaming.DStreamGraph$$anonfun$1.apply(DStreamGraph.scala:120)
    at org.apache.spark.streaming.DStreamGraph$$anonfun$1.apply(DStreamGraph.scala:120)
    at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
    at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
    at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
    at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
    at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:251)
    at scala.collection.AbstractTraversable.flatMap(Traversable.scala:105)
    at org.apache.spark.streaming.DStreamGraph.generateJobs(DStreamGraph.scala:120)
    at org.apache.spark.streaming.scheduler.JobGenerator$$anonfun$restart$4.apply(JobGenerator.scala:227)
    at org.apache.spark.streaming.scheduler.JobGenerator$$anonfun$restart$4.apply(JobGenerator.scala:222)
    at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
    at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:108)
    at org.apache.spark.streaming.scheduler.JobGenerator.restart(JobGenerator.scala:222)
    at org.apache.spark.streaming.scheduler.JobGenerator.start(JobGenerator.scala:92)
    at org.apache.spark.streaming.scheduler.JobScheduler.start(JobScheduler.scala:73)
    at org.apache.spark.streaming.StreamingContext.liftedTree1$1(StreamingContext.scala:588)
    at org.apache.spark.streaming.StreamingContext.start(StreamingContext.scala:586)
    at DubaNewsMinisiteClick$.main(DubaNewsMinisiteClick.scala:171)
    at DubaNewsMinisiteClick.main(DubaNewsMinisiteClick.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:664)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:169)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:192)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:111)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

原因及方案

• 原因： StreamingContext.checkpoint(...)指定的checkpoint目录下有另一个application生成的checkpoint文件， 导致StreamContext.getOrCreate时加载checkpoint失败， StreamingContext初始化失败
• 解决方案： 删除该checkpoint目录或换一个目录进行checkpoint。 对于重新编译的Application， checkpoint目录下必须没有其他application生成的checkpoint文件

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