Vladimir Ozerov created IGNITE-6084:
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Summary: SQL: improve lazy execution threading model
Key: IGNITE-6084
URL: https://issues.apache.org/jira/browse/IGNITE-6084
Project: Ignite
Issue Type: Task
Components: sql
Affects Versions: 2.1
Reporter: Vladimir Ozerov
Fix For: 2.2
Currently "lazy" mode creates new thread for every query. Moreover, messages
are queued to query pool first and then re-submitted to target thread. This
makes execution of small queries inefficient.
We need to do the following:
1) Define separate pool for lazy execution
2) It's size should be about 4 x cores, due to blocking nature of lazy execution
3) Set thread timeouts
4) Submit new query execute request to pool's shared queue from
{{GridIoManager}} directly
5) Submit "next page" requests to directly to proper thread, using [nodeId,
queryId, segment] triplet
6) Cancel request can be submitted to query pool and re-submitted to
appropriate threads afterwards.
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