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https://issues.apache.org/jira/browse/IGNITE-18580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Orlov updated IGNITE-18580:
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Epic Link: IGNITE-18202
> Sql. Redesign the Exchange to use a pull-based approach
> -------------------------------------------------------
>
> Key: IGNITE-18580
> URL: https://issues.apache.org/jira/browse/IGNITE-18580
> Project: Ignite
> Issue Type: Improvement
> Components: sql
> Reporter: Konstantin Orlov
> Assignee: Konstantin Orlov
> Priority: Major
> Labels: ignite-3
>
> Currently, Exchange uses push-based strategy to exchange batches between
> different fragments. Such an approach works well for cases of scanning the
> whole table, but may cause an unnecessary overhead in cases, where the
> smaller amount of rows is expected. For example, for query "SELECT * FROM
> table LIMIT 4", IO_BATCH_SIZE * IO_BATCH_COUNT * NODE_COUNT rows will be sent
> over network in push-based approach, whereas only 4 * NODE_COUNT will be sent
> in pull-based.
> Let's redesign Exchange to gain more control over amount of data that is sent
> over the network.
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