Taras Ledkov created IGNITE-9933:
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Summary: SQL: lazy mode isn't used on reduce step
Key: IGNITE-9933
URL: https://issues.apache.org/jira/browse/IGNITE-9933
Project: Ignite
Issue Type: Improvement
Components: sql
Affects Versions: 2.6
Reporter: Taras Ledkov
Assignee: Taras Ledkov
Lazy execution is introduced as default by IGNITE-9171.
But queries are executed lazy only in map phase now.
So, we have introduce lazy query execution on reduce step when merge table is
user to prevent waits for fetch all results on reduce step and excessive
allocate memory.
It will be applicable for queries sorted by index.
Attention: when reduce query is executed in lazy mode the release remote
resource and query cancellation must be changed.
See:
- {{GridReduceQueryExecutor#query}}
- {{GridReduceQueryExecutor#releaseRemoteResources}}
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