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Posted to commits@cassandra.apache.org by "Dmitry Konstantinov (Jira)" <ji...@apache.org> on 2026/05/24 15:40:00 UTC
[jira] [Updated] (CASSANDRA-21402) Avoid type lookup in SerializationHeader#getType if schema and SSTable are aligned
[ https://issues.apache.org/jira/browse/CASSANDRA-21402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dmitry Konstantinov updated CASSANDRA-21402:
--------------------------------------------
Change Category: Performance
Complexity: Normal
Fix Version/s: 6.x
7.x
Status: Open (was: Triage Needed)
> Avoid type lookup in SerializationHeader#getType if schema and SSTable are aligned
> ----------------------------------------------------------------------------------
>
> Key: CASSANDRA-21402
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21402
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/SSTable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Attachments: image-2026-05-24-16-36-12-733.png
>
>
> Cell.Serializer#deserialize lookup an actual type for every cell using SerializationHeader#getType, it is ~27% of a cell deserialization CPU cost and ~5% of total CPU cost for a read scenario (10 row partition select, CPU bound)
> if schema and SSTable are aligned we can avoid this lookup.
> !image-2026-05-24-16-36-12-733.png|width=800!
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