Enum NamespacePlacement 

pub enum NamespacePlacement {
    Unplaced,
    Prefer {
        nodes: BTreeSet<String>,
    },
    Pinned {
        nodes: BTreeSet<String>,
    },
}

Placement directive for a namespace, over the existing within-pool node routing axis ((namespace, task_queue, node)).

NamespacePlacement::Unplaced remains the default and today’s behaviour. NamespacePlacement::Prefer is a SOFT default node-label set (spill to any worker when none of the preferred labels are live); NamespacePlacement::Pinned is a HARD required node-label set (wait when none are live — opt-in isolation).

nodes are free-form node labels matched against a worker’s advertised node (a locality, not a process). BTreeSet gives deterministic ordering so the encoded form is stable. This slice (P2-P1) is storage only — nothing reads Prefer/Pinned yet; the dispatch-time two-tier spill (P2-P3) and admission gate (P2-I1) consult them in later slices.

Variants

Unplaced

No placement directive — the namespace’s records scatter across shards by name-hash like all other durable state, and its activities dispatch to any live worker (today’s behaviour).

Prefer

SOFT placement: prefer workers whose advertised node is in nodes, spilling to any live worker when none of the preferred labels are live.

Fields

nodes: BTreeSet<String>

The preferred free-form node-label set.

Pinned

HARD placement: require a worker whose advertised node is in nodes, waiting when none are live (opt-in tenant isolation).

Fields

nodes: BTreeSet<String>

The required free-form node-label set.

Trait Implementations

impl Clone for NamespacePlacement

fn clone(&self) -> NamespacePlacement

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NamespacePlacement

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

Formats the value using the given formatter.

impl Default for NamespacePlacement

fn default() -> NamespacePlacement

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for NamespacePlacement

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for NamespacePlacement

impl PartialEq for NamespacePlacement

fn eq(&self, other: &NamespacePlacement) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for NamespacePlacement

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for NamespacePlacement