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This caused continuous ZooKeeper\nsession churn and kazoo.exceptions.ConnectionLoss errors during\nLB operations.\n\nFix by holding a single KazooClient for the driver\u0027s lifetime.\nThe client is created lazily on first job_board() call via\n_ensure_client(), preserving the previous behaviour where a\nbriefly-unavailable ZooKeeper at startup does not prevent the\nworker from starting. A threading.Lock guards _client access in\nboth _ensure_client() and shutdown() to prevent races between\nconcurrent job_board() calls and service shutdown.\n\nA new shutdown() method finalizes the client on SIGTERM via\nConsumerService.terminate() -\u003e ControllerWorker.shutdown(). A\nno-op base class shutdown() means Redis and Etcd drivers need\nno changes. The kazoo import is deferred to __init__ to avoid\nrequiring kazoo in non-ZooKeeper deployments.\n\nCloses-Bug: #2144800\nChange-Id: Ia026781af131da7c91642470802d342eca259b05\nSigned-off-by: Alicja Filipek \u003calicja.filipek@cleura.com\u003e\n(cherry picked from commit ee5dc8f3356d3725800e61973e66df8a02ba6fc8)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/octavia/commit/40aae76e9ffed9ea52099c1b57d0f2cd3a37680a"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/octavia/commit/40aae76e9ffed9ea52099c1b57d0f2cd3a37680a"}]},"branch":"refs/heads/stable/2025.2","conflicts":{"base":"50316329bea5ca55b3db9841bf2f804b97247872","ours":"7fc09c0c39a7f9bc71a24227302d31ef18856b3b","theirs":"88ec42d6163d72d9938788bac15c1f72bf64fcf0","merge_strategy":"recursive","contains_conflicts":true}},"ddaa9172fb68e66f13ea0f8f0a26bcbd9b0479cb":{"kind":"REWORK","_number":2,"created":"2026-07-30 18:21:59.000000000","uploader":{"_account_id":37598,"name":"Ivan Anfimov","display_name":"Ivan Anfimov","email":"lazekteam@gmail.com","username":"anfimovir"},"ref":"refs/changes/26/999326/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/octavia","ref":"refs/changes/26/999326/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/octavia refs/changes/26/999326/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/octavia refs/changes/26/999326/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/octavia refs/changes/26/999326/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/octavia refs/changes/26/999326/2"}}},"commit":{"parents":[{"commit":"7fc09c0c39a7f9bc71a24227302d31ef18856b3b","subject":"Merge \"Add SKI and AKI extensions to amphora certificates\" into stable/2025.2","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/octavia/commit/7fc09c0c39a7f9bc71a24227302d31ef18856b3b"}]}],"author":{"name":"Alicja Filipek","email":"alicja.filipek@cleura.com","date":"2026-06-16 09:51:31.000000000","tz":120},"committer":{"name":"Ivan Anfimov","email":"lazekteam@gmail.com","date":"2026-07-30 18:21:59.000000000","tz":0},"subject":"Fix ZooKeeper session churn in ZookeeperTaskFlowDriver","message":"Fix ZooKeeper session churn in ZookeeperTaskFlowDriver\n\nZookeeperTaskFlowDriver.job_board() was called inside a `with`\nblock in _extend_jobs(), creating and immediately closing a new\nKazooClient every ~8 seconds. This caused continuous ZooKeeper\nsession churn and kazoo.exceptions.ConnectionLoss errors during\nLB operations.\n\nFix by holding a single KazooClient for the driver\u0027s lifetime.\nThe client is created lazily on first job_board() call via\n_ensure_client(), preserving the previous behaviour where a\nbriefly-unavailable ZooKeeper at startup does not prevent the\nworker from starting. A threading.Lock guards _client access in\nboth _ensure_client() and shutdown() to prevent races between\nconcurrent job_board() calls and service shutdown.\n\nA new shutdown() method finalizes the client on SIGTERM via\nConsumerService.terminate() -\u003e ControllerWorker.shutdown(). A\nno-op base class shutdown() means Redis and Etcd drivers need\nno changes. The kazoo import is deferred to __init__ to avoid\nrequiring kazoo in non-ZooKeeper deployments.\n\nCloses-Bug: #2144800\nChange-Id: Ia026781af131da7c91642470802d342eca259b05\nSigned-off-by: Alicja Filipek \u003calicja.filipek@cleura.com\u003e\n(cherry picked from commit ee5dc8f3356d3725800e61973e66df8a02ba6fc8)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/octavia/commit/ddaa9172fb68e66f13ea0f8f0a26bcbd9b0479cb"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/octavia/commit/ddaa9172fb68e66f13ea0f8f0a26bcbd9b0479cb"}]},"branch":"refs/heads/stable/2025.2"}},"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":38562,"name":"Richard Cruise","email":"rcruise@redhat.com","username":"rcruise"}},{"label":"Workflow","status":"MAY","applied_by":{"_account_id":29244,"name":"Gregory Thiemonge","email":"gthiemon@redhat.com","username":"gthiemonge"}},{"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":{"label:Verified\u003dMAX":"","label:Verified\u003dMIN":""}}},{"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":{"label:Code-Review\u003dMAX":"","label:Code-Review\u003dMIN":""}}},{"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":{"label:Workflow\u003dMAX":"","label:Workflow\u003dMIN":""}}}]}