Vladimir Ozerov updated IGNITE-6021:
    Labels: performance  (was: )

> SQL: support asynchronous page prefetch on client side
> ------------------------------------------------------
>                 Key: IGNITE-6021
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6021
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>    Affects Versions: 2.1
>            Reporter: Vladimir Ozerov
>              Labels: performance
>             Fix For: 2.2
> This ticket should be done after IGNITE-6019. We should allow users to 
> control how many pages to prefetch when executing queries. New API should be 
> constructed carefully, taking in count the following considerations:
> 1) Sometimes user wants to get the first page ASAP, e.g. to display it on UI. 
> In this case prefetch size should be 0. This is the best candidate for 
> default value.
> 2) Sometimes user wants to get all results ASAP. E.g. for batch processing. 
> In this case we should change our communication logic - instead of "request - 
> response" model, we should employ "request - all responses" model, when we 
> start query execution, and server pushes everything to the client without 
> waiting for "next page request". This should be some special value, e.g. "-1".
> 3) And sometimes user want to have some real prefetch. E.g. because 
> individual row processing on a client side is expensive, and user may benefit 
> from concurrent fetching. In this case user should be able to set some 
> positive integer defining how many pages to request in advance.

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