feat: introduce experimental support for failover quorum#7572
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gbartolini merged 22 commits intocloudnative-pg:mainfrom Jul 29, 2025
Merged
feat: introduce experimental support for failover quorum#7572gbartolini merged 22 commits intocloudnative-pg:mainfrom
gbartolini merged 22 commits intocloudnative-pg:mainfrom
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❗ By default, the pull request is configured to backport to all release branches.
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armru
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May 26, 2025
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/test limit=local |
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@armru, here's the link to the E2E on CNPG workflow run: https://github.com/cloudnative-pg/cloudnative-pg/actions/runs/15257221326 |
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mnencia
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Jul 23, 2025
Signed-off-by: Armando Ruocco <armando.ruocco@enterprisedb.com>
Signed-off-by: Armando Ruocco <armando.ruocco@enterprisedb.com>
Signed-off-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>
Signed-off-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>
Signed-off-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>
Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>
Signed-off-by: Francesco Canovai <francesco.canovai@enterprisedb.com>
Fix an issue where enabling the syncquorum on a cluster with synchronous replication prevented failovers until a configuration change. Signed-off-by: Francesco Canovai <francesco.canovai@enterprisedb.com>
Signed-off-by: Francesco Canovai <francesco.canovai@enterprisedb.com>
The .spec.cluster.name doesn't exist anymore and the syncquorum name is tied to the cluster name. We remove the column. Signed-off-by: Francesco Canovai <francesco.canovai@enterprisedb.com>
We should display how long ago the resource was generated. Signed-off-by: Francesco Canovai <francesco.canovai@enterprisedb.com>
Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>
Document how to enable the feature and how it works, with a few scenarios to make it easier to understand. Signed-off-by: Francesco Canovai <francesco.canovai@enterprisedb.com>
Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>
Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>
Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>
Signed-off-by: Francesco Canovai <francesco.canovai@enterprisedb.com>
Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>
Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>
Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>
gbartolini
approved these changes
Jul 29, 2025
fcanovai
approved these changes
Jul 29, 2025
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@ardentperf, I apologise for not mentioning your contributions in the commit itself. I will make sure we add you in #8170. |
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This commit adds opt-in, experimental support for "failover quorum", also known as "quorum-based failover", in CloudNativePG.
Failover quorum is a mechanism designed to improve data durability and safety during failover events by ensuring that the promoted replica contains all synchronously committed data.
With synchronous replication, a transaction is acknowledged only after all required synchronous standbys have received the WAL data. However, this alone doesn't guarantee that the operator can always promote the most advanced replica during a failure.
The failover quorum mechanism addresses this risk by requiring the operator to verify that a quorum of replicas agrees on the promotion. This ensures that the selected replica has all required committed data. If this quorum is not met, failover will not proceed, reducing the risk of data loss.
To enable the feature, set the annotation:
cnpg.io/failoverQuorum="true"in theClusterresource.Once stabilised, a dedicated configuration field will replace this annotation.
For further information, refer to the included documentation and the related issue.
Closes #7481