[
https://issues.apache.org/jira/browse/CASSANDRA-21362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dmitry Konstantinov updated CASSANDRA-21362:
--------------------------------------------
Description:
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!
was:
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=600!
> 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!
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
