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NodeSchedulingManager

meta_srv::node_scheduling

Struct NodeSchedulingManager 

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pub struct NodeSchedulingManager {
    kv_backend: KvBackendRef,
}
Expand description

Persists which nodes may receive new regions.

A missing key means the node is schedulable; a present key stores a NodeSchedulingValue whose schedulable field decides placement.

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§kv_backend: KvBackendRef

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impl NodeSchedulingManager

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pub fn new(kv_backend: KvBackendRef) -> Self

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pub async fn mark_unschedulable( &self, role: NodeSchedulingRole, node_id: u64, ) -> Result<bool>

Marks the node as unschedulable. Idempotent.

Returns whether the stored state changed.

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pub async fn mark_schedulable( &self, role: NodeSchedulingRole, node_id: u64, ) -> Result<bool>

Marks the node as schedulable by deleting its state. Idempotent.

Returns whether a state was removed; a node without state is already schedulable, so this returns false and writes nothing.

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pub async fn is_schedulable( &self, role: NodeSchedulingRole, node_id: u64, ) -> Result<bool>

Returns false iff the node is marked unschedulable.

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pub async fn list_unschedulable_node_ids( &self, role: NodeSchedulingRole, ) -> Result<HashSet<u64>>

Returns the ids of nodes of role that must not receive new regions.

Returns a set because callers test membership per node.

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async fn get_value( &self, key: &NodeSchedulingKey, ) -> Result<Option<NodeSchedulingValue>>

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