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https://issues.apache.org/jira/browse/CASSANDRA-21362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21362:
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Attachment: may7_noser2_alloc.html
> Avoid ByteBuffer wrapping in cql3.selection.Selector.InputRow
> -------------------------------------------------------------
>
> Key: CASSANDRA-21362
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21362
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Consistency/Coordination
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Attachments: image-2026-05-10-16-52-05-513.png, may7_noser2_alloc.html
>
>
> The logic is responsible for 10.7% of allocations in 10 row select test (if
> CASSANDRA-21354 changes are already applied)
> We read data from Memtables and SSTables as byte arrays (ArrayCell,
> ArrayClustering) but then to serialize them into CQL response we convert them
> into ByteBuffer, so for every value we have to allocate a wrapping ByteBuffer:
> !image-2026-05-10-16-52-05-513.png|width=900!
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