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Apache Cassandra®

@cassandra.apache.org
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Updates from a true open source distributed application database   trusted by thousands of successful companies for    best-in-class scalability, availability, performance      and unbeatable fault-tolerance + reliability. (I follow my PMC)

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Apache Cassandra® @cassandra.apache.org · 27/09/2026
Security, analytics, tooling. Five talks on our edges: Sidecar, mutual TLS, terabyte ingestion, analytics in place, and the command line. Apache Cassandra® track, Community Over Code, 11–13 Oct. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 26/09/2026
Five talks coming about Apache Cassandra operations at scale. Sidecar automation. 400+ clusters migrated. 4→5 upgrades. Graceful shutdown. And a management-port decision argued in public. Apache Cassandra® track, Community Over Code, Glasgow. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 22/09/2026
Storage and performance: five talks coming up on below the API. Memtables off the heap. The 6.0 write path. A profiler built into the server. Dictionary compression. And tries, aimed at tombstones. Community Over Code, Glasgow, 11–13 Oct. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 20/09/2026
Zero trust means the network is not a security boundary. For Apache Cassandra® that pushes the question down to mutual TLS: every connection authenticated, no exceptions. Francisco Guerrero, Software Engineer, Apple. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 19/09/2026
Fuzzing finds bugs by trying things. Model-guided fuzzing finds them by trying the things a model of the protocol says should be interesting. Stefan Stoicescu — TU Delft, Software Engineering Research Group cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 18/09/2026
How does Apache Cassandra® shows its transactions are correct ? A consensus protocol. A TLA+ model of it. A fuzzer guided by it. A benchmark harness. And a talk arguing the result is just a database. Five talks, Community Over Code, Glasgow. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 15/09/2026
Zstd has been Apache Cassandra®'s go-to compression since 4.0. CEP-54 adds a trained dictionary on top, landing in 6.0 — context a single block never gets to see. Stefan Miklosovic, NetApp. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 13/09/2026
A consensus protocol's paper performance and its performance under a benchmark harness are not the same number. Youki Shiraishi, Researcher at NTT, on evaluating Accord with NoSQLBench. Apache Cassandra® track, Community Over Code, Glasgow. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 12/09/2026
cqlsh has been the front door to Apache Cassandra® for over a decade, and it still needs a Python runtime. CQLAI is an Apache-2.0 alternative: one Go binary, no runtime dependency. Hayato Shimizu, AxonOps. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 08/09/2026
"The tests pass" and "the protocol is correct" are different claims. Alexandre Siret, IMDEA Software Institute, on model checking Apache Cassandra®'s transaction protocol in TLA+. Community Over Code, Glasgow, 11–13 Oct. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 06/09/2026
"Much Ado About Nothing" is the optimistic version of a major-version upgrade, and the one nobody promises out loud. Mariah and Carlos on making Apache Cassandra® 4→5 predictable. Mariah McLaughlin, Carlos Rolo — NetApp Instaclustr cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 05/09/2026
Multi-partition transactions in Apache Cassandra® rest on Accord — CEP-15, a leaderless consensus protocol built to commit across shards without a coordinator becoming the bottleneck. Fedor Ryabinin, IMDEA Software Institute, on how it works. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 01/09/2026
Bloomberg maintained a proprietary sidecar for years, then replaced it with Apache Cassandra® Sidecar and upstreamed what was missing. Isaac Reath and Paulo Motta on why they switched, and what it cost. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 31/08/2026
Profiling a production Apache Cassandra® node has meant attaching something to it and hoping. CASSANDRA-20854 puts a CPU profiler in the server. Bernardo Botella Corbi points it at 6.0's new work — Accord, CDC, constraints. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 31/08/2026
Terabyte-scale ingestion into Apache Cassandra® is a different problem from fast writes. Throughput, backpressure, and what happens when a bulk load meets live traffic. Alexandru Salajan, Site Reliability Engineer, Adobe. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 31/08/2026
Should Apache Cassandra®'s new management API reuse port 9042? No — because disablebinary shuts 9042 down, and that is precisely when you need management access. CEP-38's trade-off. Maxim Muzafarov. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Apache Cassandra® @cassandra.apache.org · 31/08/2026
Analytical workloads on Apache Cassandra® have historically meant moving the data somewhere else first. Francisco Guerrero and Saranya Krishnakumar on running them in place, and what that enables. cassandra.apache.org/_/events/202...
cassandra.apache.org
Apache Cassandra | Apache Cassandra Documentation
The Apache Cassandra track at Community Over Code 2026, Glasgow, 11-13 October
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Reposted by Apache Cassandra®
Columnar @columnar.tech · 30/08/2026
ADBC users have been asking for NoSQL support. So we released our first NoSQL driver for @cassandra.apache.org. Query Cassandra from 10+ languages through ADBC's standard interface, with results returned in @arrow.apache.org columnar format. Install the pre-release 👉 dbc install --pre cassandra
ADBC Drivers pre-release announcement for Apache Cassandra. Install command: dbc install --pre cassandra
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Apache Cassandra® @cassandra.apache.org · 30/08/2026
Memtables live on the JVM heap. The heap has a garbage collector. The garbage collector has opinions about your p99. Branimir and Kamil on moving them fully off-heap. Branimir Lambov — Software Engineer, IBM/DataStax Kamil Leśniak — Software Engineer, IBM cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 27/08/2026
Request decoding. Validation. Coordination. Memtable allocation and flush. Compaction. Metrics. A year of source-level work on the Apache Cassandra® 6.0 write path, and the flamegraphs that found each one. Dmitry Konstantinov, NetCracker Technology. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 26/08/2026
Tombstones and manual partitioning: two long-standing frustrations in Apache Cassandra®, and both fall out of one design decision. CEP-57 flattens the key hierarchy to a byte sequence and puts tries over it. Branimir Lambov and Christophe Bornet, IBM. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 25/08/2026
Apache Cassandra® supports one authenticator per node, so changing authentication method on a live cluster means moving every client at once. CEP-50 lets clients advertise what they support while the server keeps the decision. Joel Shepherd, Amazon.com. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 25/08/2026
Apache Cassandra® drivers ignore topology DOWN events — they aren't reliable. So a node deliberately shutting down keeps taking requests until its connections fail. CEP-59 tells the client instead. Jane He, IBM. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 23/08/2026
400+ Apache Cassandra® clusters. Up to 50 in a night. Zero downtime. Pegasystems and NetApp Instaclustr built a Migration API to do it. Carlos Rolo brings the alert storms, the platform limits and the split-operations bug too. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 18/08/2026
"Apache Cassandra®: A Normal Database" Transactional metadata. Distributed transactions. Full ACID. Mutation tracking. Scott Andreas lays years of community work side by side and asks what's left of the caveats – Core Databases, Apple. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 17/08/2026
[RELEASES] ⦿ Python Driver version 3.30.1 ⦿ GoCQL Driver version 2.0.0 ⦿ GoCQL Driver version 2.1.2 ⦿ Java Driver version 4.19.3 ⦿ Analytics version 0.4.0 Download them at: cassandra.apache.org/_/download.h... Thanks to everyone who helped make all these releases happen ‼️
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Apache Cassandra® @cassandra.apache.org · 16/08/2026
[RELEASE] Apache Cassandra 5.0.9 is out ‼️ Download it at: cassandra.apache.org/_/download.h... News: github.com/apache/cassa... Changelog: github.com/apache/cassa...
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Apache Cassandra® @cassandra.apache.org · 16/08/2026
[RELEASE] Apache Cassandra 6.0-alpha2 is out ‼️ This alpha off the cassandra-6.0 release branch is for testing and development purposes. Download it at: downloads.apache.org/cassandra/6.... News: github.com/apache/cassa... Changelogs: github.com/apache/cassa...
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Apache Cassandra® @cassandra.apache.org · 16/08/2026
The Apache Cassandra® community is running a three-day track at Community Over Code 2026, the official conference of the Apache Software Foundation, at the Hilton Glasgow. Twenty sessions, from twenty-seven speakers across a dozen organisations. cassandra.apache.org/_/events/202...
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Apache Cassandra® @cassandra.apache.org · 26/04/2026
CEP-53 in implementation: Rolling Restarts for #ApacheCassandra via Sidecar! Monitor, pause, resume, and abort rolling restarts through a REST API. No more babysitting restarts by hand. cwiki.apache.org/confluence/d... #ApacheCassandra #Ops #NoSQL #OpenSource #DistributedIsResilient
cwiki.apache.org
CEP-53: Cassandra Rolling Restarts via Sidecar - CASSANDRA - Apache Software Foundation
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Apache Cassandra® @cassandra.apache.org · 21/04/2026
CEP-55 is landing in #ApacheCassandra 6.0: Auto-generated role names! No more manually specifying a unique role name on every CREATE ROLE — let Cassandra generate one for you. Small UX improvement, real operational win. 🔐 cwiki.apache.org/confluence/d... #NoSQL #OpenSource #ASF
cwiki.apache.org
CEP-55 Generated role names - CASSANDRA - Apache Software Foundation
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Apache Cassandra® @cassandra.apache.org · 19/04/2026
CEP-52 is available in 6.0: Schema Annotations in CQL for #ApacheCassandra! Add inline comments and security labels to keyspaces, tables, columns, and UDTs — queryable via system views. Better documentation and classification, baked into the schema. ✍️ cwiki.apache.org/confluence/d...
cwiki.apache.org
CEP-52: Schema Annotations for ApacheCassandra - CASSANDRA - Apache Software Foundation
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Apache Cassandra® @cassandra.apache.org · 14/04/2026
CEP-43 is landing in #ApacheCassandra 6.0: CREATE TABLE LIKE! Copy an existing table's schema — columns, types, and annotations — a starting point for a new template tables. No more manual copy-paste of long CREATE TABLE statements. 🎉 cwiki.apache.org/confluence/d...
cwiki.apache.org
CEP-43 Apache Cassandra CREATE TABLE LIKE - CASSANDRA - Apache Software Foundation
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Apache Cassandra® @cassandra.apache.org · 12/04/2026
CEP-58: Satellite Datacenters has passed its vote! 🛰️ Multi-region HA using 2 full DCs + small satellite nodes — lower cost than a traditional 3-DC setup, with transactionally consistent failover and zero data loss. cwiki.apache.org/confluence/d...
cwiki.apache.org
CEP-60: Flexible Placements - CASSANDRA - Apache Software Foundation
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Apache Cassandra® @cassandra.apache.org · 07/04/2026
CEP-48 has passed vote: First-Class Materialized View support Consistency, reliability & backfill enhancements — a big step toward production-ready MVs. Follow: cwiki.apache.org/confluence/p... #ApacheCassandra #NoSQL #OpenSource #ASF
lists.apache.org
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Apache Cassandra® @cassandra.apache.org · 05/04/2026
CEP-32: OpenTelemetry Tracing is coming to #ApacheCassandra! 🔍 Vote passed. Native OTel integration — correlate Cassandra query spans with your existing observability stack. cwiki.apache.org/confluence/d... #OpenTelemetry #NoSQL #Observability #OpenSource
cwiki.apache.org
CEP-32: OpenTelemetry tracing integration - CASSANDRA - Apache Software Foundation
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Apache Cassandra® @cassandra.apache.org · 04/04/2026
[RELEASE] Apache Cassandra 6.0-alpha1 is out ‼️ This is a quarterly alpha release, for testing and development purposes. Download it at: downloads.apache.org/cassandra/6.... News: github.com/apache/cassa... Changelogs: github.com/apache/cassa...
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Apache Cassandra® @cassandra.apache.org · 31/03/2026
📅 Cassandra has formalized its release cadence: one major release per year (beginning each April), with quarterly trunk alphas in between. lists.apache.org/thread/y3fyv... Predictable upgrades as the project heads toward 6.0.
lists.apache.org
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Apache Cassandra® @cassandra.apache.org · 23/03/2026
[RELEASE] Apache Cassandra Releases 5.0.7 , 4.1.11 and 4.0.20 are out ‼️ Downloads: cassandra.apache.org/_/download.h... Changelogs:  • github.com/apache/cassa...  • github.com/apache/cassa...  • github.com/apache/cassa...
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Apache Cassandra® @cassandra.apache.org · 23/03/2026
[RELEASE] Apache Cassandra Analytics 0.3.0 is out! Downloads: downloads.apache.org/cassandra/ca... Changelog: github.com/apache/cassa... #ApacheCassandra #NoSQL #OpenSource
downloads.apache.org
Index of /cassandra/cassandra-sidecar/0.3.0
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Apache Cassandra® @cassandra.apache.org · 23/03/2026
[RELEASE] Apache Cassandra Sidecar 0.3.0 is out! Downloads: downloads.apache.org/cassandra/ca... Changelog: github.com/apache/cassa... #ApacheCassandra #NoSQL #OpenSource
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Apache Cassandra® @cassandra.apache.org · 22/03/2026
CEP-59: Graceful Disconnect for #ApacheCassandra! When a node shuts down, it now signals connected drivers via an in-band GRACEFUL_DISCONNECT event. Drivers stop new queries, let in-flight requests finish, then reconnect — no more client-side timeouts on restarts 🔄 cwiki.apache.org/confluence/p...
cwiki.apache.org
CEP-59: Graceful Disconnect – In-Band Connection Draining for Node Shutdown - CASSANDRA - Apache Software Foundation
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Apache Cassandra® @cassandra.apache.org · 22/03/2026
The #ApacheCassandra PMC is delighted to welcome Francisco Guerrero ( @francisco-guerrero.bsky.social ) as our newest PMC member! 🎉 Francisco has been a key contributor to the project — especially driving the Sidecar sub-project forward. Congratulations! 🎊 #ASF #OpenSource #NoSQL
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Apache Cassandra® @cassandra.apache.org · 08/03/2026
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Apache Cassandra® @cassandra.apache.org · 03/03/2026
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Happy Friday! Let's talk about Apache Cassandra "CEP-51: Support Include Semantics for cassandra.yaml" for a hot minute. This CEP proposes a way to split up this crucial and large file. Benefits… | Mariah McLaughlin
Happy Friday! Let's talk about Apache Cassandra "CEP-51: Support Include Semantics for cassandra.yaml" for a hot minute. This CEP proposes a way to split up this crucial and large file. Benefits include...
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Reposted by Apache Cassandra®
Bernardo Botella @me.bernardo.dev · 01/03/2026
Apache Software Foundation announced the opening of Travel Assistance Applications for next Community Over Code in Glasgow next October. tac.apache.org If you are planning to be around, please come and say hi on the @cassandra.apache.org track!
tac.apache.org
Travel Assistance Committee - TAC
The Travel Assistance Committee helps people get to ASF related events that they could not otherwise afford to attend.
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Apache Cassandra® @cassandra.apache.org · 01/03/2026
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We're halfway through this series on Apache Cassandra CEPs. Next up is "CEP-52: Schema Annotations for Apache Cassandra." Documenting your data provides a multitude of benefits from clarity for users… | Mariah McLaughlin
We're halfway through this series on Apache Cassandra CEPs. Next up is "CEP-52: Schema Annotations for Apache Cassandra." Documenting your data provides a multitude of benefits from clarity for users...
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Apache Cassandra® @cassandra.apache.org · 24/02/2026
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Shout out to Sam Lightfoot for an amazing contribution to Apache Cassandra! CASSANDRA-19987 now gives us the option to use Direct IO on compaction reads. There's a great reason to do… | Jon Haddad
Shout out to Sam Lightfoot for an amazing contribution to Apache Cassandra! CASSANDRA-19987 now gives us the option to use Direct IO on compaction reads. There's a great reason to do this: Compaction...
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Apache Cassandra® @cassandra.apache.org · 22/02/2026
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Apache Cassandra® @cassandra.apache.org · 17/02/2026
Cassandra Track at Community over Code ‼️ Submit your talks 🙏 This is the main event for our community to connect this year 🪩 news.apache.org/foundation/e...
news.apache.org
Community Over Code Call for Presentations Now Open: Introducing Lakehouse Day EU 2026  - The ASF Blog
Conference organizers for The ASF are pleased to announce the Call for Presentations for two events coming in October. This year, Community Over Code Glasgow will feature a co-located, standalone,…
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