[jira] [Created] (SPARK-7103) SparkContext.union crashed when some RDDs have no partitioner

["Steven She (JIRA)" <ji...@apache.org>]

Steven She created SPARK-7103:
---------------------------------

             Summary: SparkContext.union crashed when some RDDs have no partitioner
                 Key: SPARK-7103
                 URL: https://issues.apache.org/jira/browse/SPARK-7103
             Project: Spark
          Issue Type: Bug
    Affects Versions: 1.3.1, 1.3.0
            Reporter: Steven She


I encountered a bug where Spark crashes with the following stack trace:

{noformat}
java.util.NoSuchElementException: None.get
	at scala.None$.get(Option.scala:313)
	at scala.None$.get(Option.scala:311)
	at org.apache.spark.rdd.PartitionerAwareUnionRDD.getPartitions(PartitionerAwareUnionRDD.scala:69)
{noformat}

Here's a minimal example that reproduces it on the Spark shell:

{noformat}
val x = sc.parallelize(Seq(1->true,2->true,3->false)).partitionBy(new HashPartitioner(1))
val y = sc.parallelize(Seq(1->true))
sc.union(y, x).count() // crashes
sc.union(x, y).count() // This works since the first RDD has a partitioner
{noformat}

We had to resort to instantiating the UnionRDD directly to avoid the PartitionerAwareUnionRDD.



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