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## Problem Part of LKB-379 The pageserver connstrings are updated in the postmaster and then there's a hook to propagate it to the shared memory of all backends. However, the shard stripe doesn't. This would cause problems during shard splits: * the compute has active reads/writes * shard split happens and the cplane applies the new config (pageserver connstring + stripe size) * pageserver connstring will be updated immediately once the postmaster receives the SIGHUP, and it will be copied over the the shared memory of all other backends. * stripe size is a normal GUC and we don't have special handling around that, so if any active backend has ongoing txns the value won't be applied. * now it's possible for backends to issue requests based on the wrong stripe size; what's worse, if a request gets cached in the prefetch buffer, it will get stuck forever. ## Summary of changes To make sure it aligns with the current default in storcon. Signed-off-by: Alex Chi Z <chi@neon.tech>