Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/1486#discussion_r17525907
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -208,8 +208,10 @@ abstract class RDD[T: ClassTag](
}
/**
- * Get the preferred locations of a partition (as hostnames), taking
into account whether the
+ * Get the preferred locations of a partition, taking into account
whether the
* RDD is checkpointed.
+ * The strings returned here can be parsed into TaskLocation objects by
--- End diff --
Since `TaskLocation` is an entirely private API I'd leave this out. This
sets the expectation that user-defined RDD's can rely on our new tagging
scheme, but we didn't make that a public API. Also what if we e.g. refactor or
change the `TaskLocation` class.
I'd just say we expect it to return a string of hostnames. Or just leave it
as is.
We can decide as a follow-up whether to expose `TaskLocation`... it might
be a good idea to allow user defined RDDs to take advantage of this.
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