Vladimir Ozerov created IGNITE-6021:
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Summary: SQL: support asynchronous page prefetch on client side
Key: IGNITE-6021
URL: https://issues.apache.org/jira/browse/IGNITE-6021
Project: Ignite
Issue Type: Bug
Components: sql
Affects Versions: 2.1
Reporter: Vladimir Ozerov
Fix For: 2.2
This ticket should be done after IGNITE-5019. 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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