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This is\npart of MariaDB\u0027s transaction validation model and has been observed\nin OpenStack services like Nova and Keystone.\n\nThis change adds:\n* New DBConsistencyError exception class that inherits from DBDeadlock\n* Updated DBDeadlock docstring to cover all concurrent access conflicts\n* Filter in exc_filters.py to detect and handle MariaDB error 1020\n* Unit tests to verify proper detection and wrapping\n\nThe inheritance model ensures that existing retry decorators and error\nhandling code that catch DBDeadlock will automatically handle this new\nMariaDB consistency error, providing seamless backward compatibility\nwhile properly categorizing the error as a transient concurrency issue.\n\nThis provides better error handling for applications using oslo.db\nwith MariaDB and allows existing retry mechanisms to work without\nmodification.\n\nFor more details about this new isolation level in InnoDB, please\nsee https://mariadb.com/resources/blog/isolation-level-violation-testing-and-debugging-in-mariadb/\n\nCloses-Bug: #2116186\nChange-Id: Ie7c558ee6b82c206263227260806ca55ebdb77a9\nSigned-off-by: Hervé Beraud \u003chberaud@redhat.com\u003e\nGenerated-By: Claude Sonnet 4\n(cherry picked from commit a068372896953fc5e18518ff9ab07ce9698c8806)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/oslo.db/commit/a6659565e947ab16bdd9bb2b3fcf6bdaf396d8ab"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/oslo.db/commit/a6659565e947ab16bdd9bb2b3fcf6bdaf396d8ab"}]},"branch":"refs/heads/stable/2025.1"}},"requirements":[],"submit_records":[{"rule_name":"gerrit~DefaultSubmitRule","status":"CLOSED","labels":[{"label":"Verified","status":"MAY","applied_by":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"MAY","applied_by":{"_account_id":16137,"name":"Tobias Urdin","email":"tobias.urdin@binero.com","username":"tobasco"}},{"label":"Workflow","status":"MAY","applied_by":{"_account_id":15334,"name":"Stephen Finucane","display_name":"stephenfin","email":"stephenfin@redhat.com","username":"sfinucan"}},{"label":"Backport-Candidate","status":"MAY"}]}],"submit_requirements":[{"name":"Verified","description":"Verified in gate by CI","status":"SATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Verified\u003dMAX AND -label:Verified\u003dMIN","fulfilled":true,"status":"PASS","passing_atoms":["label:Verified\u003dMAX"],"failing_atoms":["label:Verified\u003dMIN"],"atom_explanations":{}}},{"name":"Backport-Candidate","description":"Backport candidate status","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":"Code-Review","description":"Code reviewed by core reviewer","status":"SATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Code-Review\u003dMAX AND -label:Code-Review\u003dMIN","fulfilled":true,"status":"PASS","passing_atoms":["label:Code-Review\u003dMAX"],"failing_atoms":["label:Code-Review\u003dMIN"],"atom_explanations":{}}},{"name":"Workflow","description":"Approved for gate by core reviewer","status":"SATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Workflow\u003dMAX AND -label:Workflow\u003dMIN","fulfilled":true,"status":"PASS","passing_atoms":["label:Workflow\u003dMAX"],"failing_atoms":["label:Workflow\u003dMIN"],"atom_explanations":{}}}]}