This policy will try to calculate a token to find replica nodes in which queried data is stored.
After finding the replicas it chooses the ones from the local datacenter and performs a round robin on them.
To use this policy in Session:
use scylla::{Session, SessionBuilder};
use scylla::transport::load_balancing::{DcAwareRoundRobinPolicy, TokenAwarePolicy};
use std::sync::Arc;
let local_dc: String = "us_east".to_string();
let dc_robin = Box::new(DcAwareRoundRobinPolicy::new(local_dc));
let policy = Arc::new(TokenAwarePolicy::new(dc_robin));
let session: Session = SessionBuilder::new()
.known_node("127.0.0.1:9042")
.load_balancing(policy)
.build()
.await?;