[jira] [Commented] (CASSANDRA-15080) Paxos tables should allow a configurable chunk length

["Aleksey Yeschenko (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-15080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17634824#comment-17634824 ] 

Aleksey Yeschenko commented on CASSANDRA-15080:
-----------------------------------------------

Actually allowing to modify these via {{ALTER}} would be unfortunately quite a bit involved. But we can load these from cassandra.yaml when defining the table as a compromise?

> Paxos tables should allow a configurable 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 allow the user to modify the compression settings on this table.



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