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https://issues.apache.org/jira/browse/IGNITE-12800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063311#comment-17063311
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Ignite TC Bot commented on IGNITE-12800:
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{panel:title=Branch: [pull/7551/head] Base: [master] : No blockers
found!|borderStyle=dashed|borderColor=#ccc|titleBGColor=#D6F7C1}{panel}
[TeamCity *--> Run :: All*
Results|https://ci.ignite.apache.org/viewLog.html?buildId=5139547&buildTypeId=IgniteTests24Java8_RunAll]
> 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
> Priority: Critical
> Fix For: 2.8.1
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> *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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