Github user keith-turner commented on the issue:
https://github.com/apache/accumulo/pull/243
> If we do get an Error, do we want to keep running?
What I am doing is similar to what a Future would do, except it would wrap
the Throwable with an ExecutionException. This is why I think this code would
be nicer if it used Future. However, since it constructs a tree of parallel
operations that's not easy to represent without CompletableFuture.
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