Redis: Listpack Compatibility Fix and Set Expiry Landing in 8.12
Redis cut 8.12 RC1 around two major changes: a listpack back-length compatibility fix for data written by 8.8 through 8.10, and per-member expiration for sets. A parallel sweep hardened cluster parsing, config rewrite, and expiration accounting.
Duration: PT2M23S
Episode overview
This episode is a short developer briefing from Redis.
It explains recent repository work in plain language.
- Show: Redis
- Published: 2026-10-29T13:12:16Z
- Audio duration: PT2M23S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Hello, it's October 29th, 2026, and this is your Redis developer briefing.
The lead story is data safety heading into release: Redis is restoring a long-standing storage format while landing its headline 8.12 feature.
First, listpack compatibility. Pull request 16099 reverts a threshold change from 15151 that made entries sized exactly at three boundary lengths use one byte less for their backward length marker. Writers and readers changed together, so versions 8.8 through 8.10 misread listpacks from every other version, and vice…
Second, 8.12 RC1, in pull request 16118, includes per-member set expiration in 15938. Sets can now hold members that expire on their own, mirroring hash field expiration, ending the need for a companion sorted set for sessions, rate limits, or deduplication windows. It reuses the sub-expires tracking, adds new…
Finally, a hardening sweep. 16104 fixes out-of-bounds reads from attacker-controlled cluster bus ping lengths. 16009 makes config rewrite source-aware, so values from included files or command-line overrides are no longer copied into the main config, behind a hidden flag for now. Related expire fixes stop active…
What's next: test the R-D-B upgrade…
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