Dmitry Konstantinov created CASSANDRA-20166:
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Summary: Avoid ByteBuffer allocation during decoding of CQL write
requests
Key: CASSANDRA-20166
URL: https://issues.apache.org/jira/browse/CASSANDRA-20166
Project: Apache Cassandra
Issue Type: Improvement
Reporter: Dmitry Konstantinov
Assignee: Dmitry Konstantinov
Attachments: image-2024-12-26-17-33-39-031.png,
image-2024-12-26-17-35-05-485.png
A lot of ByteBuffer objects are allocated when we decode CQL queries,
frequently the space spent for such objects is large than the actual amount of
data received.
There was a similar optimization done some time ago when a Mutation object is
receiving during a Cassandra cross-node communication: CASSANDRA-15393
While a complete replacement of ByteBuffer with byte[] during CQL decoding step
looks very complex task (ByteBuffer is a part of too many entities involved
into CQL parsing) we can optimize 20% of logic to get 80% of benefit by
focusing only on batch and modification request types when we have a lot of
cells are ingested into Cassandra via CQL interface.
!image-2024-12-26-17-33-39-031.png!
!image-2024-12-26-17-35-05-485.png!
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