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https://issues.apache.org/jira/browse/CASSANDRA-15393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17172676#comment-17172676
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Caleb Rackliffe commented on CASSANDRA-15393:
---------------------------------------------

There is a fair number of unit test 
[failures|https://app.circleci.com/pipelines/github/maedhroz/cassandra/94/workflows/9a0adbdc-56ae-48fd-91a7-1104afcba560/jobs/463],
 although they seem to mostly predate the rebase.

> Add byte array backed cells
> ---------------------------
>
>                 Key: CASSANDRA-15393
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15393
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Local/Compaction
>            Reporter: Blake Eggleston
>            Assignee: Blake Eggleston
>            Priority: Normal
>             Fix For: 4.0-beta
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> We currently materialize all values as on heap byte buffers. Byte buffers 
> have a fairly high overhead given how frequently they’re used, and on the 
> compaction and local read path we don’t do anything that needs them. Use of 
> byte buffer methods only happens on the coordinator. Using cells that are 
> backed by byte arrays instead in these situations reduces compaction and read 
> garbage up to 22% in many cases.



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