Joseph Doherty
cad3bcb6bf
A converged pair prunes its oplog on ack, so "no oplog rows at all" is the steady state of a healthy pair — not an anomaly. ComputeSnapshotRequiredAsync measured the peer's gap against the oldest surviving oplog row and treated an empty oplog as "no gap possible", which made that steady state the one state from which a wiped peer could never be healed: it reconnected with an empty database and a zero watermark, was told it needed no snapshot, and stayed empty indefinitely. With an empty oplog the oldest seq we could still stream is one past last_acked_seq — ack-pruning is the only thing that empties the oplog without also flagging needs_snapshot, and it deletes exactly seq <= last_acked_seq. Measuring the gap against that heals the wiped peer and leaves every other case identical: a converged peer's watermark equals last_acked_seq (no snapshot), and a pair that has never written anything has both at zero. Found by the OtOpcUa LocalDb Phase 1 live gate (check 4), which recorded it as a documented limitation. Covered by a test that reproduces the live-gate scenario through the real session stack: RED before this fix (the wiped side never converges, 15 s timeout), green after. 148/148 pass. Version 0.1.2. Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
25 lines
1.1 KiB
XML
25 lines
1.1 KiB
XML
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