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uberduper | 4 months ago

I've never looked at redpanda, but kafka absolutely does not. Kafka uses mmapped files and the page cache to manage durable writes. You can configure it to fsync if you like.

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mxey|4 months ago

If I don’t actually want durable and consistent data, I could also turn off fsync in Postgres …

mrkeen|4 months ago

The tradeoff here is that Kafka will still work perfectly if one of its instances goes down. (Or you take it down, for upgrades, etc.)

Can you lose one Postgres instance?