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https://issues.apache.org/jira/browse/CASSANDRA-15080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16899160#comment-16899160
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Jeff Jirsa commented on CASSANDRA-15080:
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Mentioned this in slack, but I think hard coding this is probably wrong. There
are some real and valid use cases where payloads are much larger than 4k, so
those would see a meaningful regression here. There may be a middle ground, or
it may make sense to be somewhat configurable.
> Paxos tables should use a 4KB chunk length
> ------------------------------------------
>
> Key: CASSANDRA-15080
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15080
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/Lightweight Transactions
> Reporter: Jon Haddad
> Assignee: Jon Haddad
> Priority: Normal
> Labels: performance
> Attachments: flamegraph-bad-perf.svg
>
>
> In doing some research for a client on LWTs, I found that once we start
> pushing a node hard enough, with enough LWTs, decompressing the data in the
> paxos table takes up quite a bit of time. I've attached an SVG flame graph
> showing about 10% of time is spent in LZ4_decompress_fast in queries hitting
> the paxos table. We should be able to get a nice little performance bump
> from changing this to 4KB chunk length or disabling it completely.
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