https://getfelix.dev/topics/durability/ Felix blog posts about durability. en https://getfelix.dev/blog/felix-0-5-to-0-6.html https://getfelix.dev/blog/felix-0-5-to-0-6.html Sat, 24 Oct 2026 00:00:00 +0000 What we found, fixed and added between Felix 0.5.0 and 0.6.0: the bugs that shared one shape, the ways we found them, the features that apps asked for and why, and what building it taught us. https://getfelix.dev/blog/fast-without-losing-messages.html https://getfelix.dev/blog/fast-without-losing-messages.html Fri, 23 Oct 2026 00:00:00 +0000 How Felix answers a fsynced publish in a third of a millisecond, writes at the disk's full rate under load, and slows publishers down instead of dropping their messages. https://getfelix.dev/blog/acknowledged-then-forgotten.html https://getfelix.dev/blog/acknowledged-then-forgotten.html Sat, 17 Oct 2026 00:00:00 +0000 Under Felix's default periodic fsync, a crashed broker could come back missing records it had acknowledged while the cluster still counted it as caught up; this is how review and the TLA+ model found it on the follower and leader sides, and what the fix costs. https://getfelix.dev/blog/the-follower-that-forgot.html https://getfelix.dev/blog/the-follower-that-forgot.html Sat, 17 Oct 2026 00:00:00 +0000 On an idle shard nothing ships, so a leader never learned that a follower had lost its disk; this is how a storage identity per data directory fixed that, and why it changes only when a directory may hold less than its peers were told. https://getfelix.dev/blog/introducing-felix.html https://getfelix.dev/blog/introducing-felix.html Sat, 26 Sep 2026 00:00:00 +0000 What Felix is, how a publish travels from a client to disk to every subscriber, why it is built that way, and how to run it on your laptop in five minutes.