You may find the charts on the following JIRAs interesting: https://issues.apache.org/jira/browse/CASSANDRA-17240 <https://issues.apache.org/jira/browse/CASSANDRA-17240?jql=project%20%3D%20CASSANDRA%20and%20text%20~%20%27trie%20memtables%27>
That covers the memtables. The combination of UCS (new compaction strategy), memtables, and trie indexes is covered a bit in this youtube video here: https://youtu.be/eKxj6s4vzmI?list=PLqcm6qE9lgKKls90MlpejceYUU_0qVnWa&t=2075 All told, Branimir's work here is a Big Deal. We really should invest the time in a blog post with more clarity on how impactful these changes are for data density and performance; thanks for raising this question as it helps clarify that. ~Josh On Wed, Mar 19, 2025, at 10:35 AM, Jiri Steuer (EIT) wrote: > Hi FMH, > > I haven't seen these official tests and that was the reason I did these tests > with the official tools. Regards > > J. Steuer > > ** > This item's classification is Internal. It was created by and is in property > of EmbedIT. Do not distribute outside of the organization. > > From: FMH <fmhab...@gmail.com> > *Sent:* Wednesday, March 19, 2025 3:14 PM > *To:* Cassandra Support-user <user@cassandra.apache.org> > *Subject:* [External]Cassandra 5.0: Any Official Tests Supporting 'Free > Performance Gains' > > > > This message is from an EXTERNAL SENDER - be CAUTIOUS, particularly with > links and attachments. > Please report all suspicious e-mails to helpd...@embedit.com > > > As I'm evaluating to upgrade to C* 4 or 5, one statement caught my attention > for the 5 release > (https://cassandra.apache.org/_/blog/Apache-Cassandra-5.0-Announcement.html): > "Trie Memtables and Trie SSTables These low-level optimizations yield > impressive gains in memory usage and storage efficiency, providing a "free" > performance" > > I have only found a single doc show-casing empirical evidence for such > performance gains. As per this document, compared to version 4.1, C* 5 had ... > - 38% better performance and 26% better response time for write operations > - 12% better performance and 9% better response time for read operations > > I'm just wondering if there has been any official test results supporting the > claim for 'free performance'. > > I'm trying to corroborate the test results described above. > > https://www.linkedin.com/pulse/performance-comparison-between-cassandra-version-41-5-jiri-steuer-pxbtf/ > > ---------------------------------------- > Thank you >
