Stanilovsky Evgeny created IGNITE-13086:
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Summary: Improve current page replacement mechanism.
Key: IGNITE-13086
URL: https://issues.apache.org/jira/browse/IGNITE-13086
Project: Ignite
Issue Type: Improvement
Components: persistence
Affects Versions: 2.8.1
Reporter: Stanilovsky Evgeny
Assignee: Stanilovsky Evgeny
Attachments: IgnitePdsPageReplacementTestToYard.java
Experimentally proven that current page replacement functionality has problems
with replace candidate computation. Current implementation obtain 5 random
pages and make further decisions basing this pages last touch timestamp and
some inner flags, however still possible cases when this pages set can be
simply nullified due to inner logic. All improvements need to be proven, for
example, by simple scenario:
1. put some data until event EVT_PAGE_REPLACEMENT_STARTED is triggered
2. put 2 times more data than been loaded in p1.
3. execute fullscan (through ScanQuery) for old\cold data processing emulation.
4. start processing only pages which can fit into current mem region.
5. measure "replacedPages" metric.
(i attach code mention above)
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