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In docker swarm mode (docker engine 1.12+), for the service, what is the load balancing algorithm?
Is it pluginable?
Assuming it is round-robin, is it still needed for a high level load balancer? Since whatever routing algorithm the high level load balancer is using, the load will go to each node evenly.
The algorithm is currently round-robin and I've seen no indication that it's pluginable yet. A higher level load balancer would allow swarm nodes to be taken down for maintenance, but any sticky sessions or other routing features will be undone by the round-robin algorithm in swarm mode.