Konstantin Orlov created IGNITE-18580:
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Summary: 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
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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