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https://issues.apache.org/jira/browse/CASSANDRA-19679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17852378#comment-17852378
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Sam Lightfoot commented on CASSANDRA-19679:
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[~smiklosovic] It turns out _SimpleRestriction_ is new and exists in trunk
only. The same code snippet is not present in trunk anywhere, so does not need
porting to 5.0.
Out of interest, I will profile 5.0 later today as I see other stream usage.
> Stream processing for SimpleRestriction::bindAndGetClusteringElements
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-19679
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19679
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/Core
> Reporter: Sam Lightfoot
> Assignee: Sam Lightfoot
> Priority: Normal
> Fix For: 5.x
>
> Attachments: after.png, alloc_after.html, alloc_before.html,
> image-2024-06-04-21-55-34-457.png
>
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> Part 2 (of 2) of low-hanging fruit Stream performance improvements.
> The second main Stream contributor to allocations and CPU was
> SimpleRestriction::bindAndGetClusteringElements, which contributes to 5% of
> all allocations for a 50/50 workload. The image attached shows allocation
> profiling on _trunk_ (see purple highlighted sections for Stream-related
> allocs).
> The 'after' profile for a 50/50 workload shows a reduction from 4.58%
> allocations down to 1.69%. For a 90/10 (w/r) workload we see 4.28% decrease
> to 1.10%.
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