Github user CodingCat commented on a diff in the pull request: https://github.com/apache/spark/pull/44#discussion_r10241868 --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala --- @@ -847,6 +847,8 @@ class SparkContext( partitions: Seq[Int], allowLocal: Boolean, resultHandler: (Int, U) => Unit) { + val partitionRange = (0 until rdd.partitions.size) + require(partitions.forall(partitionRange.contains(_)), "partition index out of range") --- End diff -- two questions 1. Does the Spark guarantee that RDD has continuous partition index? (I think so, as https://spark-project.atlassian.net/browse/SPARK-911 is still there) 2. Shall we put the check here or we want to check inside the specific APIs, (the current issue looks more like a bug in lookup() - forget to check the return value of getPartition before using it....)
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