java.lang.OutOfMemoryError: GC overhead limit exceeded

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GC overhead limit exceeded
java.lang.OutOfMemoryError: GC overhead limit exceeded	at java.util.HashMap.createEntry(HashMap.java:897)	at java.util.HashMap.addEntry(HashMap.java:884)	at java.util.HashMap.put(HashMap.java:505)	at java.util.HashSet.add(HashSet.java:217)	at com.pb.hadoop.spark.hexgen.function.HexGenMapFunction.call(HexGenMapFunction.java:56)	at com.pb.hadoop.spark.hexgen.function.HexGenMapFunction.call(HexGenMapFunction.java:21)	at org.apache.spark.api.java.JavaRDDLike$$anonfun$fn$1$1.apply(JavaRDDLike.scala:129)	at org.apache.spark.api.java.JavaRDDLike$$anonfun$fn$1$1.apply(JavaRDDLike.scala:129)	at scala.collection.Iterator$$anon$13.hasNext(Iterator.scala:371)	at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)	at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)	at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)	at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13$$anonfun$apply$6.apply$mcV$sp(PairRDDFunctions.scala:1197)	at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13$$anonfun$apply$6.apply(PairRDDFunctions.scala:1197)	at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13$$anonfun$apply$6.apply(PairRDDFunctions.scala:1197)	at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1251)	at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13.apply(PairRDDFunctions.scala:1205)	at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopDataset$1$$anonfun$13.apply(PairRDDFunctions.scala:1185)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)	at org.apache.spark.scheduler.Task.run(Task.scala:89)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)	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)