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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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