On 2/20/2018 12:07 PM, Darafei "Komяpa" Praliaskouski wrote:
This suggests that currently apidb replicas aren't in synchronous
mode. Can it be switched to synchronous?
https://www.postgresql.org/docs/9.5/static/warm-standby.html#SYNCHRONOUS-REPLICATION
Given the absolutely miserable performance of waiting for the data to
hit the disk on replicas, this is a bad idea and not normally
recommended, although we could use remote_apply to reduce some of the
problems.
The data loss potential is very minimal, particularly since anything
that brings down the DB server is likely to cause much larger
interruptions to mapping than the loss of 5 seconds of PostgreSQL
replication.
It's also not an issue for an editor. The API provides a diff response,
so the editor doesn't need to make another request.
In fact, this is the first API call I've seen where it is a potential
issue, and we don't even know if it is one for sure. If MapRoulette is
doing this as a batch process, it's probably easier to use the changeset
diffs anyways.
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