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Barman Cloud CNPG-I backup plugin
fb3f0f9dab
When a demoted primary rejoins the cluster after a failover, the instance manager runs `pg_rewind --restore-target-wal`, and the resulting `restore_command` invocations are served by this sidecar exactly as if an instance in recovery were asking. pg_rewind walks the timeline backwards, fetches every WAL file it needs exactly once, and treats any restore failure as fatal, so two optimizations meant for recovery break it: prefetching the following segments is wasted work that, past the end of the timeline, is guaranteed to end in an archive miss, and the end-of-wal-stream flag recorded by that miss makes a later invocation fail without contacting the object store, on a segment the archive actually has, aborting the whole rewind. The restore request now carries the context it is made in (cloudnative-pg/cnpg-i#351). When it says `MODE_REWIND`, the sidecar restores exactly the requested file: no prefetching, no end-of-wal-stream flag check, no flag recording. Requests from operators predating the field keep the current behavior. This is the plugin-side counterpart of cloudnative-pg/cloudnative-pg#11204. The cnpg-i dependency points to a pseudo-version of the protocol pull request and will move to the next tagged release once it is available. Signed-off-by: Armando Ruocco <armando.ruocco@enterprisedb.com> Signed-off-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com> Co-authored-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com> |
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Barman Cloud CNPG-I plugin for CloudNativePG
The documentation for the Barman Cloud Plugin for CloudNativePG is available at https://cloudnative-pg.io/plugin-barman-cloud.
The Barman Cloud CNPG-I plugin is a component of the CloudNativePG project and adheres to the same community-driven governance model under the CNCF.
CloudNativePG was originally built and sponsored by EDB.
Postgres, PostgreSQL, and the Slonik Logo are trademarks or registered trademarks of the PostgreSQL Community Association of Canada, and used with their permission.