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So I finally found the time, and also my issue - it was a PEBKAC all along.
My retry loop was written so haphazardly, that it was stuck in an infinite loop after experiencing rebalancing, instead of correcting it.
After fixing that, it all works as expected. There was no issue with persistent connections after all. Rebalancing halts the benchmark for 3 seconds, then traffic re-routes itself to the correct node.
The current set-up is three node cluster Postgres + PHP, with HAProxy routing the pg connects to the writeable node, and one nginx load balancer/reverse proxy. I tried PgBouncer with and without persistent PHP connects, and it made little to no measurable difference.
The whole deal is a Proof of Concept for replacing current production project, that is written in Perl+MySQL (PXC). And I dislike both with such burning passion, that I’m willing to use my free time to replace both.
And from my tests it seems that Patroni cluster can fully replace the multi-master cluster with auto-failover, and we can do switch-over without losing a single request.
Glad to hear it. All of it actually. Sounds you are content with it now.
Had to Google PEBKAC. Aren’t all problems like that?
That’s more of a philosophical question.
My only current issue with PHP is resource handling, and the lack of ability to share sockets between threads/fibers. Erlang actually does this so well, it’s a shame that language isn’t more used, and so managers are afraid of it.
Back to the question: is the resource sharing an issue with PHP, or is it my PEBKAC that I’m trying to bend PHP to something it wasn’t designed for?
At a first level it certainly is an issue with PHP, but PHP was also designed by a human. That design comes with its own problems right? I guess what I said is just a generalisation of PEBKAC as all (mostly all) software is designed by some human. Fact that it’s a different chair may as well be considered not a PEBKAC ? Yes it’s philosophical or simply which perspective you choose to see.
Haven’t played with amphp/parallel but maybe worth a look to see how/if sockets are shared there.
Yeah, for a PHP socket server, the best route would be going React/Amp route, as building a custom event loop is a big undertaking, and anyone will shoot themselves in the foot or worse.
Since they are single process loops, you don’t need to ‘share’ them, as they all belong to the only process. But that does limit you to a single process.