Tatu Saloranta created CASSJAVA-60:
--------------------------------------
Summary: Improve encoding performance of `CqlVector` by avoiding
allocation of large number of temp `ByteBuffer`s
Key: CASSJAVA-60
URL: https://issues.apache.org/jira/browse/CASSJAVA-60
Project: Apache Cassandra Java driver
Issue Type: Improvement
Components: Core
Reporter: Tatu Saloranta
When profiling service that uses Cassandra Java Driver, inserting rows with
Vector columns, I noticed that a significant source of generated garbage (and
cpu usage) was due to encoding of `CqlVector` (which is essentially thin
wrapper around `List<Float>`).
A major reason is that value is encoded using delegation so that every
individual vector element is encoded separately into throw-away `ByteBuffer`
and only appended along with others in the end to get to actual full value.
It should be possible to instead directly encode element values into fully
allocated target buffer (as element count & per-element size are known). And
possibly even just remove use of delegation if and when it is known that
elements are always `Float`s.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
