Github user pingtimeout commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/146#issuecomment-157746085
I think this case is exactly the reason why methods like `shutdown()` exist
independently from `shutdownNow()`. As you mentionned, adding
`.awaitTermination(...)` would make the async call synchronous.
I can only see 3 use cases here, and all of them are covered:
1. I want a synchronous shutdown, I should use `cluster.close()`
2. I want a asynchronous shutdown, I should use `cluster.closeAsync()`
3. I want a timely asynchronous shutdown, I should use
`cluster.closeAsync().get(5, TimeUnit.SECONDS)`
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