The simplest load balancing policy available.
Takes all nodes in the cluster and uses them one after another.\
For example if there are nodes A, B, C in the cluster,
this policy will use A, B, C, A, B, …
To use this policy in Session:
use scylla::{Session, SessionBuilder};
use scylla::transport::load_balancing::RoundRobinPolicy;
use std::sync::Arc;
let session: Session = SessionBuilder::new()
.known_node("127.0.0.1:9042")
.load_balancing(Arc::new(RoundRobinPolicy::new()))
.build()
.await?;
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