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> I searched the docs for "durability" and got zero results. The link I gave above explains it, right the sentence with "durability": > Safekeepers are respon
by est31 3y ago
> I searched the docs for "durability" and got zero results.
The link I gave above explains it, right the sentence with "durability":
> Safekeepers are responsible for durability of recent updates. Postgres streams Write-Ahead Log (WAL) to the Safekeepers, and the Safekeepers store the WAL durably until it has been processed by the Pageservers and uploaded to cloud storage.
> Safekeepers can be thought of as an ultra reliable write buffer that holds the latest data until it is processed and uploaded to cloud storage. Safekeepers implement the Paxos protocol for reliability.
- chubot 3y agoOK thanks, I glossed over that part. But really what I look for is (1) explicit claims about durability, and (2) a third party (e.g. Aphyr) actually tested the claims. If there's no claim, then it's impossible to test :) In particular, there are no numbers in the description you quoted. Litestream gives a relatively weak claim, but it could be tested, which actually gives me more confidence in it. If you look at what aphyr writes, a lot of it is claims from vendors that turned out to be false - https://aphyr.com/tags/jepsen https://aphyr.com/tags/jepsen