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Jinwoo Hong
ed462b2caa
* test(relay): reproduce drain-release contention against director placement Adds a Postgres harness that drives releases from an isolated cell over a 171 ms per-statement pool while five directors re-place reconnecting hosts through the sticky lane. At 18 releases/s placements fall from 20/s to about 5/s and every active director backend is blocked on relay_cells. Moves the per-statement delay pool into a shared test fixture so the rehome target-row test and this harness use one implementation. Claude-Session: ced32ebb-7155-4413-adad-1eccd14c2010 * fix(relay): re-place hosts off a draining cell without locking its row Sticky re-placement of a host whose cell is isolated for a roll locked every relay_cells row. During an Asia drain the source row is held by the cell's own releases for a round trip each, so the placement waited on it, the single sticky slot backed up, and /v1/assign returned 503 fleet-wide. The isolation decision now comes from an unlocked read, and the placement locks only the same-region general rows it can move to. It no longer writes the source row: the host's source leases stay, and each one's own release or expiry takes its units back off the source. The assignment keeps its activity counters and adds one control instead of resetting them. With no same-region headroom the path falls back to the all-rows lock, as before. Dormant hosts hold no units, so their placement also locks only the general rows and skips the zero write to their old cell. The drain harness now asserts the after picture: 20 placements/s at Asia latency with no director lock waits, against 9.2/s and 4.8/s before. Claude-Session: ced32ebb-7155-4413-adad-1eccd14c2010 * fix(relay): take a moved host's units off the cell that holds them After a narrowed re-placement a host keeps leases on its old cell while its assignment row names the new one. Two paths charged the row's whole counted total to the row's cell: aggregate expiry, and the lease deletion in dead-cell and stranded re-placement. Both over-charged the new cell and left the old cell's units stranded. Aggregate expiry now skips hosts that still hold any lease; the lease sweep takes each lease's units off its own cell. Placement frees each deleted lease's units on that lease's cell, charges the old cell only for units no lease backs, and sets the counters from the leases it keeps plus the new control. The narrowed path runs only when the counters already match the leases, so it never needs to write the old cell's row. The all-rows re-placement off an isolated cell follows the same rule, so it no longer decrements the source at placement either. Claude-Session: ced32ebb-7155-4413-adad-1eccd14c2010 * fix(relay): try other regions before the all-rows lock when re-placing off a roll With every same-region neighbour at its connection cap, the narrowed path found no target and fell back to the all-rows lock behind the busy source row, which is the drain brownout again. It now tries a second tier, general cells in every other region, in its own transaction over one ordered lockCellRows, still never the source row. Only when no general cell in any region has room does it fall back to the all-rows path, which keeps the pin. This changes the policy from #21911, which refused to re-place an isolated host across a region. The unit tests that encoded that rule now assert the tier order instead. The drain harness gains a US cell and an arm with every Asia neighbour capped: 200 of 200 dials placed cross-region at 20/s with no lock waits, against 0 placed and 144 sticky rejections on the previous head. Its pass bars are now the rejection share and the lock-waiting share, not the placement rate a slow runner's pacing can move. Claude-Session: ced32ebb-7155-4413-adad-1eccd14c2010 * fix(relay): take the narrowed path for hosts whose counters sit below their leases Main's old placement reset a moved host's counters while keeping its source leases, and those leases' releases floored the counters at zero. Such hosts hold fewer counted units than lease units, and requiring equality sent them down the all-rows path behind the busy source row. The narrowed path now requires only that the host holds no units no lease backs, the one case that needs a write to the old row. Its placement already rebuilds the counters from the kept leases plus the new control, so a drifted host is healed by its next re-placement. Claude-Session: ced32ebb-7155-4413-adad-1eccd14c2010 * test(relay): judge the local drain arm on completion and lock waits, not rate The local-latency arm asserted at least 18 placements/s at a 20/s dial rate, which a slow runner's pacing alone can miss. It now asserts what the Asia arm does: no dial failures, sticky rejections under 10% of dials, every other dial placed, and director lock-waiting under half a backend. Claude-Session: ced32ebb-7155-4413-adad-1eccd14c2010