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GitWeb","url":"https://opendev.org/openstack/nova/commit/380f657b5102707a3da676478e72fd96691e966b"}]}],"author":{"name":"huanhongda","email":"hongda.xun@easystack.cn","date":"2026-05-28 08:42:03.000000000","tz":480},"committer":{"name":"huanhongda","email":"hongda.xun@easystack.cn","date":"2026-05-28 09:05:01.000000000","tz":480},"subject":"Fix scheduler aggregate cache race on concurrent add_host","message":"Fix scheduler aggregate cache race on concurrent add_host\n\nWhen concurrent add_host API calls target the same aggregate with\ndifferent hosts, each request reads the aggregate from DB under its\nown transaction snapshot, appends its host, and sends the aggregate\nobject via RPC to the scheduler. The RPC payload is a stale snapshot\nthat only contains the hosts visible in that transaction, missing the\nhost added by the concurrent request.\n\nThe scheduler\u0027s _update_aggregate replaces its in-memory cache with\nthe received snapshot and also removes hosts not present in the\nsnapshot from host_aggregates_map. This causes previously-added hosts\nto be silently dropped from the cache, leading to incorrect scheduling\ndecisions by AggregateExtraSpecsFilter and AvailabilityZoneFilter.\n\nFix by re-reading the aggregate from DB in _update_aggregate instead\nof trusting the RPC snapshot. The DB is always the source of truth\nand concurrent add_host writes are protected by transactions and\nunique constraints, so the DB always has the complete host membership.\nIf the aggregate has been deleted between the RPC send and the\nscheduler processing, AggregateNotFound is caught and the stale cache\nis cleaned up gracefully.\n\nCloses-Bug: #2054428\nCo-Authored-By: GLM-5.1\nChange-Id: I544939d7175cc26022345c839a129710c02b66a5\nSigned-off-by: hongda.xun \u003chongda.xun@easystack.cn\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/3de1520ef3d1dd55d9eec962d305ea0e564b2ccb"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/3de1520ef3d1dd55d9eec962d305ea0e564b2ccb"}]},"branch":"refs/heads/master"},"08d3efc34fa4f8636cfc0e913cddc5a3a8751a03":{"kind":"NO_CODE_CHANGE","_number":2,"created":"2026-05-29 02:25:39.000000000","uploader":{"_account_id":26286,"name":"huanhongda","email":"hongda.xun@easystack.cn","username":"huanhongda"},"ref":"refs/changes/37/990437/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/37/990437/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/37/990437/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/37/990437/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/37/990437/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/37/990437/2"}}},"commit":{"parents":[{"commit":"380f657b5102707a3da676478e72fd96691e966b","subject":"Merge \"Keep cached VIF until host-side unplug succeeds\"","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/380f657b5102707a3da676478e72fd96691e966b"}]}],"author":{"name":"huanhongda","email":"hongda.xun@easystack.cn","date":"2026-05-28 08:42:03.000000000","tz":480},"committer":{"name":"huanhongda","email":"hongda.xun@easystack.cn","date":"2026-05-29 02:25:04.000000000","tz":480},"subject":"Fix scheduler aggregate cache race on concurrent add_host","message":"Fix scheduler aggregate cache race on concurrent add_host\n\nWhen concurrent add_host API calls target the same aggregate with\ndifferent hosts, each request reads the aggregate from DB under its\nown transaction snapshot, appends its host, and sends the aggregate\nobject via RPC to the scheduler. The RPC payload is a stale snapshot\nthat only contains the hosts visible in that transaction, missing the\nhost added by the concurrent request.\n\nThe scheduler\u0027s _update_aggregate replaces its in-memory cache with\nthe received snapshot and also removes hosts not present in the\nsnapshot from host_aggregates_map. This causes previously-added hosts\nto be silently dropped from the cache, leading to incorrect scheduling\ndecisions by AggregateExtraSpecsFilter and AvailabilityZoneFilter.\n\nFix by re-reading the aggregate from DB in _update_aggregate instead\nof trusting the RPC snapshot. The DB is always the source of truth\nand concurrent add_host writes are protected by transactions and\nunique constraints, so the DB always has the complete host membership.\nIf the aggregate has been deleted between the RPC send and the\nscheduler processing, AggregateNotFound is caught and the stale cache\nis cleaned up gracefully.\n\nCloses-Bug: #2154428\nCo-Authored-By: GLM-5.1\nChange-Id: I544939d7175cc26022345c839a129710c02b66a5\nSigned-off-by: hongda.xun \u003chongda.xun@easystack.cn\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/08d3efc34fa4f8636cfc0e913cddc5a3a8751a03"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/08d3efc34fa4f8636cfc0e913cddc5a3a8751a03"}]},"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","applied_by":{"_account_id":26286,"name":"huanhongda","email":"hongda.xun@easystack.cn","username":"huanhongda"}}]}],"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":""}}}]}