Github user HeartSaVioR commented on the issue:
https://github.com/apache/storm/pull/2443
While working with Streams API, I feel the needs for Source (typed Spout)
and Sink (typed Sink Bolt) so have been thinking about interfaces/abstract
classes, but due to ACK mechanism and various approaches of implementing
external sink bolts, hiding concept of `Tuple` doesn't look like easy.
I have another wondering case to windowing with timestamp field: Streams
API doesn't expose field name, but Streams API still receive field name for
timestamp field. It may need to be addressed before STORM-2405 (support
windowing aggregation in SQL).
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