Jepsen @jepsen@jepsen.io

A small change to the ethics policy (https://jepsen.io/ethics): for environmental reasons, Jepsen no longer performs analyses of proof-of-work or proof-of-space systems.

Jepsen 0.2.4 is now available. New SSH backend options, performance improvements, and a local filesystem cache to speed up DB setup. Happy testing! https://github.com/jepsen-io/jepsen/releases/tag/0.2.4

https://scattered-thoughts.net/writing/internal-consistency-in-streaming-systems/

"We might get outputs that are arbitrarily wrong, up to and including breaking program invariants"

"The outputs might never converge to correctness"

Giving a short talk on Jepsen at LADIS this afternoon! Our session starts at 14:45 US Eastern. https://ladisworkshop.org/2021/

Live stream:
https://www.youtube.com/watch?v=0cfJNFt1bWA

New release! Maelstrom 0.2.0 is a workbench for learning distributed systems by writing your own, in any language. Comes with a six-chapter tutorial in writing your own toy echo, gossip, CRDT, Datomic, and Raft systems. Powered by Jepsen and Elle! https://github.com/jepsen-io/maelstrom

New Jepsen release: 0.2.3. Super small, just a few bugfixes and performance improvements. Enjoy! https://github.com/jepsen-io/jepsen/releases/tag/0.2.3

Howdy guys, gals, and non-binary pals! Jepsen 0.2.2 is now available, with a slew of minor bugfixes, performance improvements, and new utility functions. Look out for a change to multi-fault nemesis scheduling: https://github.com/jepsen-io/jepsen/releases/tag/0.2.2

Giving a talk next week with the ScyllaDB folks, talking about Jepsen, transactional analysis, and all the cool bugs we found in Scylla. https://go.scylladb.com/wbn-jepsen-test-registration.html?utm_channel=Webinar&utm_so[%E2%80%A6]Partner&utm_medium=KK&utm_campaign=WBN-2021-01-28-Jepsen-Test

New #Jepsen report: we worked with @ScyllaDB to identify and fix cases of LWT split-brain in healthy clusters due to improper hashing and membership changes, as well as documentation improvements. Notably, Scylla no longer claims non-LWT isolation! https://jepsen.io/analyses/scylla-4.2-rc3

Here's the slides for the most recent Jepsen talk, presented at #YOW20: https://aphyr.com/media/talks/2020/jepsen-13.pdf

Can you really say data loss is a *myth* if it's still the default behavior? https://developer.mongodb.com/article/everything-you-know-is-wrong#myth-7--mongodb-loses-data

Happy to announce Jepsen 0.2.1 is now available: https://github.com/jepsen-io/jepsen/releases/tag/0.2.1

Jepsen's AWS Marketplace product (launches a whole Jepsen cluster in a few clicks) has been updated for Debian Buster, and now includes additional dependencies you'll want for running tests based on Elle. Happy testing!

https://aws.amazon.com/marketplace/pp/Jepsen-LLC-Jepsen/B01LZ7Y7U0

Put a bunch of work into the Jepsen docker-compose setup, and I'm pleased to report it now gives you a full Debian Buster cluster with keys and dependencies out of the box--should be good for running the latest tests. Hopefully this helps!

https://github.com/jepsen-io/jepsen/tree/master/docker

🤔 https://docs.datastax.com/en/dse/6.0/cql/cql/cql_reference/cql_commands/cqlBatch.html

Do you use Cassandra or another CQL-compatible database? I'd like to hear your perspective on adding things to a CQL set: https://docs.google.com/forms/d/e/1FAIpQLSc5EqGjHA6HwXcvm5Om0jfNjaiKybHLjeppB32K502Amdsa8g/viewform?usp=sf_link