Support stale / consistent queries

[jhmartin]

https://www.consul.io/docs/agent/http.html under 'Consistency Modes'

[evan2645]

Beyond this? https://github.com/WeAreFarmGeek/diplomat/blob/master/lib/diplomat/kv.rb#L16

[taharah]

@jhmartin does what @evan2645 provide the functionality you were looking for?

[maxvt]

https://www.consul.io/docs/agent/http.html says "most read query endpoints support specifying consistency". At the very least, this option would be useful for service and health API endpoints, because for service discovery being consistent is often less important than getting at least some results right.

For more context, see https://stripe.com/blog/service-discovery-at-stripe.

Consul v0.7.5 does not balk at those options being added to either health or catalog lookups.

[kamaradclimber]

Any progress on that feature? Not being able to use stale makes every application based on diplomat unreliable when consul cluster does not have a leader.

[pierresouchay]

Please also consider 'leader' consistency mode => which forces basic consistency over discovery endpoints

• ?stale => allow to read from any consul server
• ?consistent => strong consistency
• default => consistent (but can be changed on discovery endpoints, see discovery_max_stale
• ?leader => new in 1.0.7, allow to use old consistent method for discovery endpoints

[pierresouchay]

Would you consider #165 ?

Kind regards

[pierresouchay]

Now available with the changes in 2.1.0