[
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!
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
