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From Dmitriy Setrakyan <dsetrak...@apache.org>
Subject Re: Allow distributed SQL query execution over explicit set of partitions
Date Mon, 23 Jan 2017 21:52:15 GMT
On Mon, Jan 23, 2017 at 11:16 AM, Alexei Scherbakov <
alexey.scherbakoff@gmail.com> wrote:

> Dmitriy,
>
> This still can make sense for some scenarios, because we could limit number
> of initial map requests reducing overall query overhead.
>
> Are you still sure we need to throw an exception ?
>

The outcome and the resulting behavior needs to be absolutely clear to our
users. If we can't provide any sort of guarantee here, I would disallow it
altogether.


>
> 2017-01-23 1:49 GMT+03:00 Dmitriy Setrakyan <dsetrakyan@apache.org>:
>
> > On Sun, Jan 22, 2017 at 5:06 AM, Alexei Scherbakov <
> > alexey.scherbakoff@gmail.com> wrote:
> >
> > > Yes, it will be possible because distributed joins are executed using
> > > broadcast queries.
> > >
> > >
> > In this case why even bother supporting non-collocated joins? We need to
> > throw an exception in this case.
> >
> > 2017-01-22 15:49 GMT+03:00 Dmitriy Setrakyan <dsetrakyan@apache.org>:
> > >
> > > > On Sun, Jan 22, 2017 at 4:46 AM, Alexei Scherbakov <
> > > > alexey.scherbakoff@gmail.com> wrote:
> > > >
> > > > > Dmitriy,
> > > > >
> > > > > ScanQueries currently support only one partition. I will extend it
> to
> > > > > support multiple partitions.
> > > > >
> > > > > For distributed joins partitions will only be applied on "map"
> query
> > > > step.
> > > > >
> > > >
> > > > Will it still be possible to get data from the partitions that were
> not
> > > > specified?
> > > >
> > >
> > >
> > >
> > > --
> > >
> > > Best regards,
> > > Alexei Scherbakov
> > >
> >
>
>
>
> --
>
> Best regards,
> Alexei Scherbakov
>

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