Taegeon Um

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@nhne I've skimmed through this PR, but it looks like it has a bunch of duplicated codes. Can't we minimize the duplicated codes? Maybe we need to refactor the original...

@bgchun Either way is fine with me :) so @nhne, could you please refactor the tests?

@nhne I think you could do the same refactoring on `RemoteManagerTest.java`, as you did on `TransportTest` :)

@nhne LGTM except for the last comment :)

The sub-issue of #750

We currently throw an exception when the data timestamp is less than the latest watermark timestamp. I don't think throwing an exception is good because it is not an exception....

That was the problem of my query submission code. I will close this issue.