Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/221#issuecomment-38613782
The drawback of waiting N seconds on the listener bus is that this is still
a race condition. Because this happens at the end of the application,
configuring N can be tricky because you may have to re-run the entire
application again if N is not sufficiently large for all events to be
processed. I guess to workaround that we could just make N arbitrarily large.
A major plus of this approach is that it doesn't include changing the
public API, which is always nice.
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