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Reliable PostgreSQL Backup & RestoreProject mention: Anything can be a message queue if you use it wrongly enough | news.ycombinator.com | 2023-06-04
This isn't theoretical; many companies do PostgreSQL async 1:N physical replication, by using e.g. https://pgbackrest.org/ to have the primary push WAL segment files (a.k.a. "the last n milliseconds of packets" in the write-ahead log) as objects to S3, and then to have all read-replicas fetch from S3 and replay.
> You could do even better if you out-of-band signal the readiness so you do not need to poll while idle.
S3 and its clones have "object lifecycle notifications", where you can be informed by a push-based mechanism whenever a new object is put into the bucket.
But — what do you have to do, to get these notifications?
Subscribe to a message queue that S3 puts them into.
Fork of the popular zip manipulation library found in the zlib distribution.
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