Taras Ledkov created IGNITE-12800:
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Summary: SQL: local queries cursors must be closed or full read to
unlock the GridH2Table.
Key: IGNITE-12800
URL: https://issues.apache.org/jira/browse/IGNITE-12800
Project: Ignite
Issue Type: Bug
Components: sql
Affects Versions: 2.8
Reporter: Taras Ledkov
Assignee: Taras Ledkov
Fix For: 2.9
*Root cause:* local queries cursors must be closed or full read to unlock the
GridH2Table.
*Proposal fix:*
- modify {{H2ResultSetIterator}} to use "paged mode": iterator reads N records
into internal buffer and unlock the tables (similar to {{MapQueryResult}};
later we have to refactor these classes. They must use one code base to fetch
data and lok/unlock tables)
- modify the state logic of the {{QueryCursorImpl}} for lazy mode. Now the real
query cancellation isn't called when result set is gathered. It is not valid
for lazy mode.
- add wrapper for iterator at the {{RegisteredQueryCursor}} because the state
of query isn't tracked when results are read via Iterator at the client code.
- fix tests that doesn't close query cursor for local queries.
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