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Step 2 stops stalwart.service and step 4 points the fork at a store path.
Between those two moments nothing protects the original, and the rehearsal
had already shown that one open by the fork costs the rollback for good.
What protects it until then turns out to be the running server itself:
RocksDB refuses a second opener with "While lock file: LOCK: Resource
temporarily unavailable". So the intuition that a service shutdown prevents
the mistake is backwards — the shutdown is what enables it.
Measured, in probe_guard.py, in the three states that matter: held by the
running server, the fork is refused and the rollback is intact; stopped but
read-only, the fork is refused while rotating its own log and the Enterprise
build still starts on it afterwards; stopped and writable, the fork opens,
adds its column family, and upstream never starts again.
So step 3 now makes the original read-only as soon as the copy is taken,
which turns a discipline problem into a one-line one, and the answered
section carries the table.
jcoffey-dev