hard20 pts · first answer countshigh-availabilitypostgresql

Primary demoted when etcd is unreachable

The etcd cluster used by Patroni becomes unreachable, and the healthy primary demotes itself to read-only. Why does Patroni do this by default?

A.Patroni has a bug when etcd restartsB.Read-only mode makes etcd recover fasterC.Without renewing its leader key it cannot prove it is still the only primary, so it demotes to avoid split-brainD.PostgreSQL requires etcd to write WAL

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