[CASSANDRA-15393] Add byte array backed cells

• Type: Sub-task
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.0, 4.0-beta3
• Component/s: Local/Compaction
• Change Category: Performance
• Complexity: Normal
• Platform: All

Source Control Link

https://github.com/apache/cassandra/commit/ccab496d2d37c86341d364dea6c27513fda27331

Test and Documentation Plan

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• Assignee: Blake Eggleston
• Reporter: Blake Eggleston

Authors

Blake Eggleston

Reviewers

Blake Eggleston, Caleb Rackliffe, Marcus Eriksson

• Created: 30/Oct/19 22:37
• Updated: 21/Dec/20 09:29
• Resolved: 14/Sep/20 16:07

Description

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.