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Posted to commits@cassandra.apache.org by "Blake Eggleston (Jira)" <ji...@apache.org> on 2020/08/04 16:54:00 UTC

[jira] [Updated] (CASSANDRA-15393) Add byte array backed cells

     [ https://issues.apache.org/jira/browse/CASSANDRA-15393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Blake Eggleston updated CASSANDRA-15393:
----------------------------------------
    Reviewers: Marcus Eriksson, Sam Tunnicliffe  (was: Benedict Elliott Smith, Sam Tunnicliffe)

> 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
>
>
> 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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