Upgrade failed
Author: pdadCreated Aug 3, 2026Updated Aug 5, 2026
Labelskind/bug
Version & Environment
Redpanda version: v25.2.14 AKS/Kubernetes: v1.34.2
What went wrong?
Upgrade redpanda from v25.1.12 to v25.2.14 seemed to work. When checking logical versions via each broker's admin API, all reported being on logical version 16.
Upgrade redpanda from v25.2.14 to v25.3.15 failed on broker redpanda-2 due to logical version gate: "Attempted to upgrade from incompatible logical version 15 to logical version 17!"
What should have happened instead?
I expected the upgrade to work since it looked like all brokers were on logical version 16. It seems the gate condition is evaluated against something other than what the admin API get's the logical version from.
How to reproduce the issue?
Haven't tried to reproduce it. This happened in our production environment.
Additional information
Source: redpanda-data/redpanda