Anton Laletin created IGNITE-28547:
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Summary: Refine ARIES/KVL to prevent phantom reads
Key: IGNITE-28547
URL: https://issues.apache.org/jira/browse/IGNITE-28547
Project: Ignite
Issue Type: Improvement
Reporter: Anton Laletin
We previously planned to implement a concurrency control approach to prevent
phantom reads, but this was not completed. As a result, the current ARIES/KVL
algorithm implementation is not fully correct and may allow phantom read
scenarios.
To address this, we need to investigate and prototype an improved approach.
The idea is to enhance the current algorithm, inspired by ARIES/KVL, by
introducing short-term page-level latches during both scan and insert
operations. In particular:
Scans acquire short latches on the current and the next page while traversing
data
Inserts also acquire short latches on the relevant pages during key placement
Additionally, inserts may require an exclusive lock on the next key to ensure
proper serialization.
This approach is intended to prevent scenarios where concurrent inserts can
“slip through” between scan steps, leading to phantom reads.
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