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GitWeb","url":"https://opendev.org/openstack/nova/commit/67dd46dc49c828c84d7687f17885b1dbab4743b5"}]}],"author":{"name":"Shi Yan","email":"yanshi.403@gmail.com","date":"2026-05-23 11:24:56.000000000","tz":600},"committer":{"name":"Shi Yan","email":"yanshi.403@gmail.com","date":"2026-05-23 12:25:22.000000000","tz":600},"subject":"Add circuit breaker to scatter_gather_cells","message":"Add circuit breaker to scatter_gather_cells\n\nWhen a cell becomes unreachable in a cellsv2 deployment, every\ncross-cell API request blocks for the full CELL_TIMEOUT (60s) before\nreturning sentinels for the down cell. Under normal load this\nexhausts the nova-api worker pool within seconds and degrades the\nAPI globally, even for endpoints that don\u0027t depend on the failed\ncell. Existing mitigations (list_records_by_skipping_down_cells,\ndisabling the cell mapping) do not shorten the per-request wait.\n\nThe Stein handling-down-cell spec identified an in-memory cache as\nthe right next step but deferred it to future work [1].\n\nThis change adds an opt-in per-process recent-failure cache. A new\n``[api] cell_failure_hold_seconds`` option (default 0, legacy\nbehavior) records cells that raise or time out during a scatter and\nshort-circuits them with did_not_respond_sentinel on subsequent\ncalls for that many seconds. A successful response clears the mark\nimmediately so transient races don\u0027t pin a cell as down, and stale\nentries are dropped lazily on lookup so the cell is re-tested once\nthe window expires.\n\n[1] https://specs.openstack.org/openstack/nova-specs/specs/stein/implemented/handling-down-cell.html\n\nGenerated-by: Claude Opus 4.7 (claude-opus-4-7)\nChange-Id: I88eca7d04911994407c2f70d9fe325c3c81d7170\nSigned-off-by: Shi Yan \u003cyanshi.403@gmail.com\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/479b7b934c71723077a0bddc1af226e2c4ae396d"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/479b7b934c71723077a0bddc1af226e2c4ae396d"}]},"branch":"refs/heads/master"}},"requirements":[],"submit_records":[{"rule_name":"gerrit~DefaultSubmitRule","status":"OK","labels":[{"label":"Verified","status":"MAY","applied_by":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"MAY"},{"label":"Workflow","status":"MAY"},{"label":"Review-Priority","status":"MAY"}]}],"submit_requirements":[{"name":"Verified","description":"Verified in gate by CI","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Verified\u003dMAX AND -label:Verified\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Verified\u003dMAX","label:Verified\u003dMIN"],"atom_explanations":{"label:Verified\u003dMAX":"","label:Verified\u003dMIN":""}}},{"name":"Code-Review","description":"Code reviewed by core reviewer","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Code-Review\u003dMAX AND -label:Code-Review\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Code-Review\u003dMAX","label:Code-Review\u003dMIN"],"atom_explanations":{"label:Code-Review\u003dMAX":"","label:Code-Review\u003dMIN":""}}},{"name":"Review-Priority","description":"Review Priority","status":"NOT_APPLICABLE","is_legacy":false,"applicability_expression_result":{"fulfilled":false,"status":"FAIL"},"submittability_expression_result":{"expression":"is:true","fulfilled":true,"status":"NOT_EVALUATED","passing_atoms":[],"failing_atoms":[],"atom_explanations":{}}},{"name":"Workflow","description":"Approved for gate by core reviewer","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Workflow\u003dMAX AND -label:Workflow\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Workflow\u003dMAX","label:Workflow\u003dMIN"],"atom_explanations":{"label:Workflow\u003dMAX":"","label:Workflow\u003dMIN":""}}}]}