Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/9256#issuecomment-153975680
I took a broad pass on the public API's and left comments throughout,
mostly around naming rather than core structure. What would really be helpful
for me is filling in the documentation on the key public classes `State`,
`StateSpec`, `trackStateByKey`, and `stateSnapshots()` to make sure I fully
understand their semantics. I can take a pass again once that is done, but the
high level approach seems good to me.
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