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From Yakov Zhdanov <yzhda...@apache.org>
Subject Re: Computation on NodeEntries
Date Wed, 16 Dec 2015 09:16:57 GMT
I see your point Andrey, and I agree that having an opportunity not to
bring results back, but process them in place is cool.

Sergi, can you please file a ticket and put your design suggestions to it?

--Yakov

2015-12-15 20:51 GMT+03:00 Andrey Kornev <andrewkornev@hotmail.com>:

> Or, alternatively it would be nice to have a way submitting a query from a
> single node. But instead of bringing the results back, the user would be
> able to specify a closure that would be sent along with the query to the
> nodes where the query will be executed. The closure would then be invoked
> by the query executor for each matching entry locally. With this approach
> the user would not have to worry about the state of partitions since Ignite
> would hopefully be able to take care of that (as it presumably already does
> while executing the SQL query).
>
> I believe the good ol' GridGain product used to have an API like that, but
> then, in a misguided effort to dumb down the APIs, this useful feature was
> dropped.
>
> Thanks
> Andrey
>
> ------------------------------
> Date: Tue, 15 Dec 2015 20:26:39 +0300
> Subject: Re: Computation on NodeEntries
> From: alexey.goncharuk@gmail.com
> To: user@ignite.apache.org
>
> Ah, now I see your point. It looks like we need to add an ability to run
> an SQL query against an individual partition - this would have worked for
> your use-case the same way a Scan query works.
>
> I wonder of anybody in the community with a deeper knowledge of query
> processing can estimate the complexity of this feature and create a ticket
> with a proper description.
>
>

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