Enum scylla::transport::session::PoolSize

pub enum PoolSize {
    PerHost(NonZeroUsize),
    PerShard(NonZeroUsize),
}

The target size of a per-node connection pool.

Variants

PerHost(NonZeroUsize)

Indicates that the pool should establish given number of connections to the node.

If this option is used with a Scylla cluster, it is not guaranteed that connections will be distributed evenly across shards. Use this option if you cannot use the shard-aware port and you suffer from the “connection storm” problems.

PerShard(NonZeroUsize)

Indicates that the pool should establish given number of connections to each shard on the node.

Cassandra nodes will be treated as if they have only one shard.

The recommended setting for Scylla is one connection per shard - PerShard(1).

Trait Implementations

impl Clone for PoolSize

fn clone(&self) -> PoolSize

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PoolSize

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

Formats the value using the given formatter.

impl Default for PoolSize

fn default() -> Self

Returns the “default value” for a type.

impl Copy for PoolSize