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java.lang.Exception: here	at org.apache.spark.memory.TaskMemoryManager.releaseExecutionMemory(TaskMemoryManager.java:197)	at org.apache.spark.util.collection.Spillable$class.releaseMemory(Spillable.scala:111)	at org.apache.spark.util.collection.ExternalAppendOnlyMap.releaseMemory(ExternalAppendOnlyMap.scala:55)	at org.apache.spark.util.collection.ExternalAppendOnlyMap.org$apache$spark$util$collection$ExternalAppendOnlyMap$$freeCurrentMap(ExternalAppendOnlyMap.scala:259)	at org.apache.spark.util.collection.ExternalAppendOnlyMap$$anonfun$iterator$1.apply$mcV$sp(ExternalAppendOnlyMap.scala:251)	at org.apache.spark.util.CompletionIterator$$anon$1.completion(CompletionIterator.scala:46)	at org.apache.spark.util.CompletionIterator.hasNext(CompletionIterator.scala:35)	at org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:197)	at org.apache.spark.shuffle.BlockStoreShuffleReader.read(BlockStoreShuffleReader.scala:103)	at org.apache.spark.rdd.ShuffledRDD.compute(ShuffledRDD.scala:98)	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)	at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)	at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)	at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)	at org.apache.spark.scheduler.Task.run(Task.scala:89)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:213)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)