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Ettore Di Giacinto
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Phase 1 left the connection fence with a table and no sockets behind it. This adds the registry that holds them: Attach claims the node and then stores the session, Open hands out a stream over the tunnel this replica holds, Detach releases the claim it was handed, and Held names what this process is carrying. The claim is written before the session is stored. A claimant that installs itself and only then finds it cannot claim has, for that window, published a tunnel no row records, so Held names it while a peer asking Owner is told the worker is connected nowhere. ErrNotOwner is produced at one place, the map miss. It is a routing fact: some other replica may hold that worker perfectly well. A broken socket under a held entry is returned as itself, because answering "not held here" would send a dialer looking elsewhere for a worker this replica is holding. Epochs are compared for equality and never ordered. Claim guarantees an epoch is unique and never reissued; it does not guarantee the later claim draws the larger number, because the sequence value on the insert path is drawn before the row lock. The membership loop now re-claims on re-register, which closes the hole phase 1 named in ReapStale. A replica that stalls long enough is swept by a peer, losing its instance row and, in the same transaction, every connection it owned; Register rebuilds the instance row and nothing else, so without this it serves workers that every other replica reports as connected nowhere. Re-claiming draws a fresh epoch, so an attachment carries two: the token Attach handed back, which is what Detach matches and which never moves, and the epoch of the row currently held, which is what Release is given. Collapsing them would leave the re-claimed row outliving the socket with no caller able to remove it. A tunnel whose session is already closed is skipped rather than claimed back, because claiming is an upsert and would take the row from whoever holds the worker now. Assisted-by: Claude Opus 5 [claude-code] Signed-off-by: Ettore Di Giacinto <mudler@localai.io>