I think this is that thread :)
But as I said it is just a matter of what we want to add, and we can
already do it.
On Wed, May 13, 2015 at 11:37 AM, Stephan Ewen <se...@apache.org> wrote:
> This is a pretty central question, actually (timestamping the results of
> windows). Let us kick off a separate thread for this...
>
> On Wed, May 13, 2015 at 9:20 AM, Bruno Cadonna <
> cado...@informatik.hu-berlin.de> wrote:
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Hi,
> >
> > I think timestamping results of a time window operator is essential.
> > Without timestamps in the results, it is not possible to execute two
> > time window operators one after the other.
> >
> > Cheers,
> > Bruno
> >
> > On 12.05.2015 18:30, Aljoscha Krettek wrote:
> > > Hi, I'll try to make it quick this time. I think we need to make
> > > information about the event time of an element and information
> > > about windows in which it resides accessible to the user. A simple
> > > example would be the aggregation of some user behaviour, for
> > > example:
> > >
> > > in = clickSource()
> > >
> > > analysedData = in .window(10 minutes).every(5 minutes)
> > > .groupBy("userId") .filter(is something interesting)
> > > .sum("something")
> > >
> > > analysedData.storeToMySystem()
> > >
> > > Now the results of this window aggregation tell me that at some
> > > point, there was some window and in this window some attribute
> > > summed up to this. This might not be very helpful. What might be
> > > helpful is the information that there occurred a spike in something
> > > at 12:45 on Wednesday. Therefore, I think we need to make this
> > > information available somehow.
> > >
> > > I only have some rough Ideas about how this might work, but I
> > > would first like to discuss whether others even think this
> > > necessary. So fire away...
> > >
> > > Cheers, Aljoscha
> > >
> >
> > - --
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > Dr. Bruno Cadonna
> > Postdoctoral Researcher
> >
> > Databases and Information Systems
> > Department of Computer Science
> > Humboldt-Universität zu Berlin
> >
> > http://www.informatik.hu-berlin.de/~cadonnab
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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