java.lang.ClassCastException

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  • Secondar Sorting in spark using clojure/flambo
    via by Punit Naik,
    • java.lang.ClassCastException: org.formcept.wisdom.RFMCKey cannot be cast to java.lang.Comparable at org.spark-project.guava.collect.NaturalOrdering.compare(NaturalOrdering.java:28) at scala.math.LowPriorityOrderingImplicits$$anon$7.compare(Ordering.scala:153) at org.apache.spark.util.collection.ExternalSorter$$anon$8.compare(ExternalSorter.scala:170) at org.apache.spark.util.collection.ExternalSorter$$anon$8.compare(ExternalSorter.scala:164) at org.apache.spark.util.collection.TimSort.countRunAndMakeAscending(TimSort.java:252) at org.apache.spark.util.collection.TimSort.sort(TimSort.java:110) at org.apache.spark.util.collection.Sorter.sort(Sorter.scala:37) at org.apache.spark.util.collection.SizeTrackingPairBuffer.destructiveSortedIterator(SizeTrackingPairBuffer.scala:83) at org.apache.spark.util.collection.ExternalSorter.partitionedIterator(ExternalSorter.scala:687) at org.apache.spark.util.collection.ExternalSorter.iterator(ExternalSorter.scala:705) at org.apache.spark.shuffle.hash.HashShuffleReader.read(HashShuffleReader.scala:64) at org.apache.spark.rdd.ShuffledRDD.compute(ShuffledRDD.scala:92) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:277) at org.apache.spark.CacheManager.getOrCompute(CacheManager.scala:70) at org.apache.spark.rdd.RDD.iterator(RDD.scala:242) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:35) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:277) at org.apache.spark.rdd.RDD.iterator(RDD.scala:244) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:61) at org.apache.spark.scheduler.Task.run(Task.scala:64) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:203) 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)

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