Description
Logging this based on mailing list discussion
http://mail-archives.apache.org/mod_mbox/crunch-user/201510.mbox/%3CCANb5z2KBqxZng92ToFo0MdTk2fd8jtGTjZ85h1yUo_akaetcXg%40mail.gmail.com%3E
Running a Crunch SparkPipeline with FirstN aggregator results in a NullPointerException.
Example to recreate this
https://gist.github.com/nasokan/853ff80ce20ad7a78886
Stack trace on driver logs.
15/10/05 16:02:33 WARN TaskSetManager: Lost task 3.0 in stage 0.0 (TID 0, 123.domain.xyz): java.lang.NullPointerException at org.apache.crunch.impl.mr.run.UniformHashPartitioner.getPartition(UniformHashPartitioner.java:32) at org.apache.crunch.impl.spark.fn.PartitionedMapOutputFunction.call(PartitionedMapOutputFunction.java:62) at org.apache.crunch.impl.spark.fn.PartitionedMapOutputFunction.call(PartitionedMapOutputFunction.java:35) at org.apache.spark.api.java.JavaPairRDD$$anonfun$pairFunToScalaFun$1.apply(JavaPairRDD.scala:1002) at org.apache.spark.api.java.JavaPairRDD$$anonfun$pairFunToScalaFun$1.apply(JavaPairRDD.scala:1002) at scala.collection.Iterator$$anon$11.next(Iterator.scala:328) at scala.collection.Iterator$$anon$11.next(Iterator.scala:328) at org.apache.spark.util.collection.ExternalSorter.spillToPartitionFiles(ExternalSorter.scala:366) at org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:211) at org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:63) at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:68) at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41) at org.apache.spark.scheduler.Task.run(Task.scala:64) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:203) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)