Comparing Exceptions and Errors

[Ola Fosheim Grøstad]

On Saturday, 4 June 2022 at 18:32:48 UTC, Sebastiaan Koppe wrote:
> Most wont throw a Error though. And typical services have 
> canary releases and rollback.
>
> So you just fix it, which you have to do anyway.

I take it you mean manual rollback, but the key issue is that you 
want to retry on failure. Not infrequently the source for the 
failure will be in the environment, the code just didn't handle 
the failure correctly.

On a service with SLA of 99.999% the probable "failure time" 
would be 6 seconds per week, so if you can retry you may still 
run fine even if you failed to check correctly for an error on 
that specific subsystem. That makes the system more 
resilient/robust.