Bug#1034667: ITP: pg-failover-slots -- High-availability support for PostgreSQL logical replication

[Marco Nenciarini <mnencia@debian.org>]

Package: wnpp
Severity: wishlist
Owner: Marco Nenciarini <mnencia@debian.org>
X-Debbugs-Cc: debian-devel@lists.debian.org, team+postgresql@tracker.debian.org

* Package name    : pg-failover-slots
  Version         : 1.0.0
  Upstream Contact: EnterpriseDB <info@enterprisedb.com>
* URL             : https://github.com/EnterpriseDB/pg_failover_slots
* License         : Postgres License
  Programming Lang: C
  Description     : High-availability support for PostgreSQL logical replication

This extension is for anyone with Logical Replication Slots on
Postgres databases that are also part of a Physical Streaming
Replication architecture.

Since logical replication slots are only maintained on the primary
node, downstream subscribers don't receive any new changes from a
newly promoted primary until the slot is created, which is unsafe
because the information that includes which data a subscriber has
confirmed receiving and which log data still needs to be retained for
the subscriber will have been lost, resulting in an unknown gap in
data changes. PG Failover Slots makes logical replication slots usable
across a physical failover using the following features:

- Copies any missing replication slots from the primary to the standby
- Removes any slots from the standby that aren't found on the primary
- Periodically synchronizes the position of slots on the standby based
  on the primary
- Ensures that selected standbys receive data before any of the
  logical slot walsenders can send data to consumers

PostgreSQL 11 on higher is required.