Github user markhamstra commented on the pull request:
https://github.com/apache/incubator-spark/pull/468#discussion_r9777964
Doesn't need to be `Iterable` itself, but only implicitly `Iterable` (as is
`Option`). In fact, what I believe Patrick was suggesting is that
`tachyonStore` be made into an `Option` so that the common Scala idiom of
`anOption.foreach(doSomethingIfSome(_))` can be used. Even without changing
the type of `tachyonStore`, a form of this idiom can be used anywhere `!= null`
is used (but that's not a stylistic quirk that we've adopted consistently):
`Option(tachyonStore).foreach(_.doSomething)`
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