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https://issues.apache.org/jira/browse/CASSANDRA-21141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21141:
--------------------------------------------
Description:
We allocate a lot of objects during a transformation of BatchStatement to
Mutation. In many typical scenarios we can have a fast path and reduce the
amount of allocated objects (as well as make the correspondent logic faster)
Allocation framegraph:
!image-2026-01-28-09-39-38-183.png|width=600!
[^trunk_alloc.html]
[^trunk_cpu.html]
[^trunk_wall.html]
Forecasted reduction for heap allocations in a batch write test ~ 21%:
{code}
Total GC memory : 347.198 GiB
vs
Total GC memory : 272.358 GiB
{code}
was:
We allocate a lot of objects during a transformation of BatchStatement to
Mutation. In many typical scenarios we can have a fast path and reduce the
amount of allocated objects (as well as make the correspondent logic faster)
Allocation framegraph:
!image-2026-01-28-09-39-38-183.png|width=600!
[^trunk_alloc.html]
[^trunk_cpu.html]
[^trunk_wall.html]
Forecasted reduction in allocation in a batch write test:
{code}
Total GC memory : 347.198 GiB
vs
Total GC memory : 272.358 GiB
{code}
> Reduce memory allocation during transformation of BatchStatement to Mutation
> ----------------------------------------------------------------------------
>
> Key: CASSANDRA-21141
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21141
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: CQL/Interpreter
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 5.x
>
> Attachments: image-2026-01-28-09-39-38-183.png, trunk_alloc.html,
> trunk_cpu.html, trunk_wall.html
>
>
> We allocate a lot of objects during a transformation of BatchStatement to
> Mutation. In many typical scenarios we can have a fast path and reduce the
> amount of allocated objects (as well as make the correspondent logic faster)
> Allocation framegraph:
> !image-2026-01-28-09-39-38-183.png|width=600!
> [^trunk_alloc.html]
> [^trunk_cpu.html]
> [^trunk_wall.html]
> Forecasted reduction for heap allocations in a batch write test ~ 21%:
> {code}
> Total GC memory : 347.198 GiB
> vs
> Total GC memory : 272.358 GiB
> {code}
>
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