undefined | Better HN

0 pointsthreeseed2y ago0 comments

You horizontally scale for high availability as well as scalability.

And primary-secondary failover in my experience is rarely without issues.

There is a reason almost every new database aims to be distributed from the beginning.

0 comments

>> There is a reason almost every new database aims to be distributed from the beginning.

That's partly because you can't compete with the existing RDBMSs if you're single node: they are good enough already. Nobody will buy your database if you don't introduce something more novel than PostgreSQL, whether that novelty is worth it or not.

paulddraper2y ago

Primary-secondary is simple and robust. If I had a dollar for every time I saw split-brain clusters....

---

And to respond sibling comment about "noticeable" downtime....

Primary-secondary failover in <1m is very feasible. And each minute downtime is a mere 0.002% for the month.

Primary-secondary isn't what is hurting your availability.

threeseedOP2y ago

The experience for at least some of us is that failover is not robust. At all. And that < 1m is best case scenario that still requires a person to be monitoring the process.

And given that the entire industry has moved to a distributed model despite its complexity gives you a hint as to which way the wind has been blowing for the last decade.

ibotty2y ago

You don't need to be that arrogant. The number-one reason why there are no new (No)SQL-Databases for one node is that the existing databases are great and you can't monetize them.

Failover is automatic for PG when using e.g. Patroni. Of course you lose active transactions and that might be a showstopper, but monitoring failover? I am curious when you'll have to do that.

j / k navigate · click thread line to collapse