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https://issues.apache.org/jira/browse/CRUNCH-568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Whitacre updated CRUNCH-568:
----------------------------------
Attachment: CRUNCH-568a.patch
Took a stab at writing an integration test for this problem to prove the patch
fixes the problem. Unfortunately couldn't get it to fail prior to adding the
fix. Here's the test I was trying to add. Going to offline for a bit so free
to experiment to get it to fail to verify Josh's fix.
> Aggregators fail on SparkPipeline
> ---------------------------------
>
> Key: CRUNCH-568
> URL: https://issues.apache.org/jira/browse/CRUNCH-568
> Project: Crunch
> Issue Type: Bug
> Components: Spark
> Affects Versions: 0.12.0
> Reporter: Nithin Asokan
> Attachments: CRUNCH-568.patch, CRUNCH-568a.patch
>
>
> 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.
> {code}
> 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)
> {code}
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