Struct scylla::transport::load_balancing::RoutingInfo

pub struct RoutingInfo<'a> {
    pub consistency: Consistency,
    pub serial_consistency: Option<SerialConsistency>,
    pub token: Option<Token>,
    pub table: Option<&'a TableSpec<'a>>,
    pub is_confirmed_lwt: bool,
}

Represents info about statement that can be used by load balancing policies.

Fields

consistency: Consistency

Requested consistency information allows to route queries to the appropriate datacenters. E.g. queries with a LOCAL_ONE consistency should be routed to the same datacenter.

serial_consistency: Option<SerialConsistency>

token: Option<Token>

Information that are the basis of token-aware routing:

• token, keyspace for vnodes-based routing;
• token, keyspace, table for tablets-based routing.

table: Option<&'a TableSpec<'a>>

is_confirmed_lwt: bool

If, while preparing, we received from the cluster information that the statement is an LWT, then we can use this information for routing optimisation. Namely, an optimisation can be performed: the query should be routed to the replicas in a predefined order (i. e. always try first to contact replica A, then B if it fails, then C, etc.). If false, the query should be routed normally. Note: this a Scylla-specific optimisation. Therefore, the flag will be always false for Cassandra.

Trait Implementations

impl<'a> Clone for RoutingInfo<'a>

fn clone(&self) -> RoutingInfo<'a>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for RoutingInfo<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Default for RoutingInfo<'a>

fn default() -> RoutingInfo<'a>

Returns the “default value” for a type.