And I would be remiss if I didn't mention this. If you are doing any testing on your own... SHARE! When we say "Your mileage may vary" it's a great contribution to the project to share 1) Your use case 2) How you tested 3) What you found.
Blog post. An email to user@. A social media post. It all counts. If you need help, just hit me up on email or slack.Happy to assist in any way. Patrick On Thu, Mar 20, 2025 at 6:28 AM Josh McKenzie <jmcken...@apache.org> wrote: > 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 > > >
