17/07/17 15:34:55 ERROR yarn.ApplicationMaster: User class threw exception: java.lang.UnsupportedOperationException: empty collection

java.lang.UnsupportedOperationException: empty collection

	at org.apache.spark.rdd.RDD$$anonfun$reduce$1$$anonfun$apply$40.apply(RDD.scala:1027)

	at org.apache.spark.rdd.RDD$$anonfun$reduce$1$$anonfun$apply$40.apply(RDD.scala:1027)

	at scala.Option.getOrElse(Option.scala:120)

	at org.apache.spark.rdd.RDD$$anonfun$reduce$1.apply(RDD.scala:1027)

	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:150)

	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:111)

	at org.apache.spark.rdd.RDD.withScope(RDD.scala:316)

	at org.apache.spark.rdd.RDD.reduce(RDD.scala:1007)

	at sparkoffline.DayCount$.dayCount(DayCount.scala:44)

	at sparkoffline.Main$.main(Main.scala:35)

	at sparkoffline.Main.main(Main.scala)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:498)

	at org.apache.spark.deploy.yarn.ApplicationMaster$$anon$2.run(ApplicationMaster.scala:558)

17/07/17 15:34:55 INFO yarn.ApplicationMaster: Final app status: FAILED, exitCode: 15, (reason: User class threw exception: java.lang.UnsupportedOperationException: empty collection)

17/07/17 15:34:55 INFO spark.SparkContext: Invoking stop() from shutdown hook

org.apache.spark.shuffle.MetadataFetchFailedException: Missing an output location for shuffle 12

	at org.apache.spark.MapOutputTracker$$anonfun$org$apache$spark$MapOutputTracker$$convertMapStatuses$2.apply(MapOutputTracker.scala:548)

	at org.apache.spark.MapOutputTracker$$anonfun$org$apache$spark$MapOutputTracker$$convertMapStatuses$2.apply(MapOutputTracker.scala:544)

	at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)

	at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)

	at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:108)

	at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)

	at org.apache.spark.MapOutputTracker$.org$apache$spark$MapOutputTracker$$convertMapStatuses(MapOutputTracker.scala:544)

	at org.apache.spark.MapOutputTracker.getMapSizesByExecutorId(MapOutputTracker.scala:155)

	at org.apache.spark.shuffle.BlockStoreShuffleReader.read(BlockStoreShuffleReader.scala:47)

	at org.apache.spark.rdd.ShuffledRDD.compute(ShuffledRDD.scala:98)

	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)

	at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)

	at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)

	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)

	at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)

	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:73)

	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)

	at org.apache.spark.scheduler.Task.run(Task.scala:89)

	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:227)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

	at java.lang.Thread.run(Thread.java:745)