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Task not serializable
org.apache.spark.SparkException: Task not serializable	at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:304)	at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:294)	at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:122)	at org.apache.spark.SparkContext.clean(SparkContext.scala:2055)	at org.apache.spark.rdd.RDD$$anonfun$filter$1.apply(RDD.scala:341)	at org.apache.spark.rdd.RDD$$anonfun$filter$1.apply(RDD.scala:340)	at org.apache.spark.rdd.RDDOperationScope$.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.filter(RDD.scala:340)