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False Alarms in Highly Available Postgres Clusters

Umair Shahid pulls the alarm:

False alarms can be a significant problem in highly available clusters of PostgreSQL. They can cause unnecessary downtime and disruptions that can impact the performance of the nodes. In this blog post, we will explore the causes, prevention, and resolution of false alarms in PostgreSQL clusters.

It’s a good idea to sit back and think about how complex the problem of high availability is, even if the service (SQL Server, Postgres, or whatever) offers capabilities to simplify a lot of it. The trick is that you want your service to fail over if and only if it needs to, but what tells you if it “needs to” is noisy signal.