Re: Reduce DEBUG level of catcache refreshing messages

"Jelte Fennema-Nio" <postgres(at)jeltef(dot)nl> writes:
> When testing extensions using pgregress, it can be useful to introduce
> some new DEBUG logs which are specific to the extension and change the
> log level during part of the of the test.

> There's a problem though: Often a "rehashing catalog cache ..." debug
> message will also show up in those cases. It's not always possible to
> predict when these messages show, and when they do their contents can
> easily change if changes are made to an unrelated test or when run
> against a different Postgres version. This change lowers the log level
> of these messages to DEBUG5, so that they can be ignored while still
> showing other (more predictable) DEBUG messages.

I don't have an opinion about the merits of this exact change, but
I wish somebody would go through all our DEBUGn messages and come up
with some coherent proposal for what the various levels should be
used for. Right now I think those choices are purely idiosyncratic
and have been made differently in different patches.

Your usage example already suggests one possible rule:

* DEBUG1 is reserved for testing patches and should never be used
in permanent code.

Maybe that particular idea is not appropriate for some reason.
But if we could have *some* kind of explainable basis for
assigning DEBUGn levels, I think our lives would be better.

regards, tom lane