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From Biplob Biswas <revolutioni...@gmail.com>
Subject Re: Flink QueryableState with Sliding Window on RocksDB
Date Mon, 31 Jul 2017 07:52:31 GMT
Thanks Fabian for the reply, I was reconsidering my design and the
requirement and what I mentioned already is partially confusing. 

I realized that using a sessionwindow is better in this scenario where I
want a value to be updated per key and the session resets to wait for the
gap period with every update after which it should be removed.

>From whatever I read currently about session windows (and windows in
general), is that I can perform aggregates over it. What I was thinking was
that rather than performing an aggregate or reduce, I can simply replace the
old value. 

now my problem is, would such a state be queryable? 

As you mentioned that siding windows are defined on streams, is it the same
for session windows? 

"I basically want a state which updates by key, and where records can
self-destruct after a fixed amount of time(basically records being part of a
session) if not updated (such that the state doesn't grow indefinitely)?"  

Are there any abstractions to do the same and if not, is it possible to
discuss if this can be done otherwise? 

Thanks a lot,
Biplob



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