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## Problem "John pointed out that the switch to protocol version 2 made test_gc_aggressive test flaky: https://github.com/neondatabase/neon/issues/7692. I tracked it down, and that is indeed an issue. Conditions for hitting the issue: The problem occurs in the primary GC horizon is set to a very low value, e.g. 0. If the primary is actively writing WAL, and GC runs in the pageserver at the same time that the primary sends a GetPage request, it's possible that the GC advances the GC horizon past the GetPage request's LSN. I'm working on a fix here: https://github.com/neondatabase/neon/pull/7708." - Heikki ## Summary of changes Use protocol version 1 as default.