Github user arunmahadevan commented on the pull request:
https://github.com/apache/storm/pull/855#issuecomment-153962977
@haohui Thanks for the feedback and yes your points are valid. We will
incrementally add a state store for partial results and the window state and
reduce window re-evaluation during replay. However, I am not sure if the tuples
in window should spill over to a persistent store. I think we should rely on
storm's acking mechanism to replay the events and expect that the spouts can
reliable replay the events from a persistent store (e.g. kafka). This is
consistent with storm's idea of not persisting in-transit tuples anywhere.
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