Roman Kondakov created IGNITE-8974:
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Summary: MVCC TX: Vacuum cleanup version obtaining optimization.
Key: IGNITE-8974
URL: https://issues.apache.org/jira/browse/IGNITE-8974
Project: Ignite
Issue Type: Improvement
Components: cache, sql
Reporter: Roman Kondakov
At the moment vacuum process obtains cleanup version as the same way as
transactions do. It implies some unnecessary complications and even minor
performance drop due to calculation entire tx snapshot instead of just a
cleanup version number or sending unnsecessary tx end acks back to the
coordinator. Possible solutions are:
* Local caching cleanup version from the last obtained tx snapshot and use it
in vacuum process. But in this way not all outdated versions could be cleaned
(i.e. keys updated by this last tx).
* Implement a special method for calculating cleanup version on the
coordinator state and Request and Response messages for vacuum runned on
non-coordinator side.
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