Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/1362#discussion_r15018547
--- Diff: core/src/main/scala/org/apache/spark/Dependency.scala ---
@@ -32,8 +32,6 @@ abstract class Dependency[T](val rdd: RDD[T]) extends
Serializable
/**
* :: DeveloperApi ::
- * Base class for dependencies where each partition of the parent RDD is
used by at most one
- * partition of the child RDD. Narrow dependencies allow for pipelined
execution.
--- End diff --
It's true that this doesn't cover CartesianRDD, but at the same time I
think we shouldn't remove this comment. Maybe change it to "where each
partition of the child RDD depends on a small number of partitions of the
parent RDD". That will also cover Cartesian. And leave the part about
pipelining.
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