This looks great! Looking forward to playing around with it.
I loved the idea of Airbnb's Synapse, but it's tricky to configure (you basically have to write an haproxy config from scratch plus learn how synapse config sections map to the haproxy config). Plus it seemed like the non-zookeeper backends were pretty unstable, I had to fix a few things to get it working with ec2 tags (and fwiw, at this point it's been over a month and my PR to merge the changes back upstream hasn't even been commented on).
How does Baker Street handle restarting haproxy, does it do anything like this[0] automatically to get zero-downtime configuration reloads?
Currently we use the restart procedure as described in the haproxy manual. We would like to get to true zero downtime though, we've been looking both at the method described in the post you mention as well as possibly using nginx in favor of haproxy to achieve this.
I loved the idea of Airbnb's Synapse, but it's tricky to configure (you basically have to write an haproxy config from scratch plus learn how synapse config sections map to the haproxy config). Plus it seemed like the non-zookeeper backends were pretty unstable, I had to fix a few things to get it working with ec2 tags (and fwiw, at this point it's been over a month and my PR to merge the changes back upstream hasn't even been commented on).
How does Baker Street handle restarting haproxy, does it do anything like this[0] automatically to get zero-downtime configuration reloads?
[0] http://engineeringblog.yelp.com/2015/04/true-zero-downtime-h...