Struct PinnedAllocationStrategy 

pub struct PinnedAllocationStrategy {
    pub region: String,
}

Pin every shard to a specific region (useful for tests / static allocation). analog: a custom strategy returning a constant region.

Fields

region: String

Trait Implementations

impl ShardAllocationStrategy for PinnedAllocationStrategy

fn allocate_shard( &self, _shard_id: &str, _regions: &HashMap<String, usize>, ) -> Option<String>

Pick a region to host shard_id. regions lists known candidates (region path → current shard count). Returns the chosen region’s path, or None if regions is empty.

fn rebalance( &self, _current: &HashMap<String, String>, _regions: &HashMap<String, usize>, ) -> Vec<String>

Decide which shards should migrate. current_allocations is the shard → region mapping; regions lists region shard counts. Returns shard ids to hand off (the coordinator picks the destination).