Re: Behaviour of CountWindowAll

[Aljoscha Krettek <al...@apache.org>]

Hi,
I’m afraid this is not possible right now. I’m also not sure about the Evictors as a whole. Using them makes window operations very slow because all elements in a window have to be kept, i.e. window results cannot be pre-aggregated.

Cheers,
Aljoscha
> On 15 Dec 2015, at 12:23, Radu Tudoran <ra...@huawei.com> wrote:
> 
> Hi,
>  
> I believe this question might have been asked before - so sorry for repeating it (I just did not find the discussion on the mailing list).
>  
> Is it possible somehow to create a new DataStream from the elements that are evicted from a window?
>  
> A simple use case for this is: 
> We have data coming from a sensor every second. We want to compute all the times the average on the last 5 seconds and on the interval from 5 seconds ago until 10 seconds ago.
> I would be interested in how the data evicted from the main window that keeps the fresh data could be feed into a new stream on which I could apply again a window of 5 seconds.
> (Having a 10 seconds window and selecting only the most ancient 5 second data is not a viable option) 
>  
> Regards,