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org.apache.spark.SparkException: Task not serializable at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:298) at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:288) at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:108) at org.apache.spark.SparkContext.clean(SparkContext.scala:2038) at org.apache.spark.SparkContext.runJob(SparkContext.scala:1897) at org.apache.spark.SparkContext.runJob(SparkContext.scala:1912) at org.apache.spark.rdd.RDD$$anonfun$collect$1.apply(RDD.scala:884) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:357) at org.apache.spark.rdd.RDD.collect(RDD.scala:883) at org.apache.spark.sql.execution.SparkPlan.executeCollect(SparkPlan.scala:290)