[jira] [Commented] (CRUNCH-568) Aggregators fails on SparkPipeline

["Nithin Asokan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CRUNCH-568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14945177#comment-14945177 ] 

Nithin Asokan commented on CRUNCH-568:
--------------------------------------

I was thinking through this and can the solution be simple as defaulting to a specific partition when key is {{null}}?

https://github.com/apache/crunch/blob/apache-crunch-0.13.0/crunch-spark/src/main/java/org/apache/crunch/impl/spark/fn/PartitionedMapOutputFunction.java#L64

> Aggregators fails 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
>
> 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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