Styx supports three load balancing strategies:
- Power of two
- Round-robin
- Busy
Styx also provides a mechanism to bypass the load balancer and force the origin at source.
This mode cycles through available origins, choosing the next in sequence on each use, while skipping over the origins with saturated connection pools.
This algorithm always returns the origin with a least number of simultaneously ongoing requests. Randomly chooses a winner when there is a tie between the "best" origins.
This load balancing algorithm randomly picks two origins, and chooses the better out of the two.
When origins restriction feature is enabled, you can force the HTTP request to be proxied to the origin of choice.
For example, to force a request to be forwarded to an origin called landing-03, you would add the origins restriction cookie to the request with a value of "landing-03".
The value can also be set to a comma-separated list of regular expressions. In that case, Styx proxies the request to any of the origins matching the specified regular expressions.
To enable this feature, add originRestrictionCookie configuration
attribute to the Styx proxy configuration file as follows:
originRestrictionCookie: <restriction-cookie-name>
The restriction-cookie-name is a string value of your choice. It is the name of the cookie that should contain the origins restriction information.
Load balancing strategies and the origin restriction feature are configured in the Styx proxy configuration file.
To enable Power of Two load balancing strategy:
loadBalancing:
strategy:
factory: {class: "com.hotels.styx.client.loadbalancing.strategies.PowerOfTwoStrategy$Factory"}
To enable Busy load balancing strategy:
loadBalancing:
strategy:
factory: {class: "com.hotels.styx.client.loadbalancing.strategies.BusyConnectionsStrategy$Factory"}
To enable Round Robin load balancing strategy:
loadBalancing:
strategy:
factory: {class: "com.hotels.styx.client.loadbalancing.strategies.RoundRobinStrategy$Factory"}