ivankelly commented on issue #775: Tests wait for client to see started bookie URL: https://github.com/apache/bookkeeper/pull/775#issuecomment-347040409 I don't care about the type of the return, and I had <Void> originally. However, it's impossible to complete a CompletableFuture<Void> without triggering a findbugs error, which is why I used Set<BookieSocketAddress>. I currently have no intention of using the Set<BookieSocketAddress> that's returned, but I needed to return something, and that was a natural candidate.
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