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https://issues.apache.org/jira/browse/CASSANDRA-21399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21399:
--------------------------------------------
Fix Version/s: 6.0-alpha2
7.0
(was: 6.x)
(was: 7.x)
Source Control Link:
https://github.com/apache/cassandra/commit/c0999f04d1a0afa767be4a6afb0354081fd5d7e7
Resolution: Fixed
Status: Resolved (was: Ready to Commit)
> Megamorphic call overhead at
> org.apache.cassandra.io.util.RandomAccessReader#current
> ------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21399
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21399
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/SSTable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.0-alpha2, 7.0
>
> Attachments: CASSANDRA-21399-6.0_ci_summary.htm.zip,
> image-2026-05-23-16-17-07-684.png, isEOF_cpu.png
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> 0.9% of overall CPU in profile is spent in
> org.apache.cassandra.io.util.RandomAccessReader#current
> when we do a polymorphic call of
> org.apache.cassandra.io.util.Rebufferer.BufferHolder#offset
> we can avoid it by caching the offset value for the current block on
> RandomAccessReader level.
> !image-2026-05-23-16-17-07-684.png|width=600!
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