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https://issues.apache.org/jira/browse/CASSANDRA-21414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21414:
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Status: Ready to Commit (was: Review In Progress)
> Reduce cost to calculate BTreeRow.minDeletionTime
> -------------------------------------------------
>
> Key: CASSANDRA-21414
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21414
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Other
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Attachments: CASSANDRA-21414-6.0_ci_summary.htm.zip,
> CASSANDRA-21414-trunk_ci_summary.htm.zip, image-2026-05-31-22-04-44-862.png
>
>
> When we do a merge on read (or when we build a row from data sent from a
> client) we need to calculate minDeletionTime value, currently it is done by
> BTreeRow.Builder#build and it iterates over cells to calculate this value,
> for simple and typical cases we can build it while Builder is being filled
> with data to avoid the iteration overheads.
> It costs about 1.4% of CPU for a 10 row plain selection test
> !image-2026-05-31-22-04-44-862.png|width=900!
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