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CoordinatorState

mito2::compaction::scheduler::coordinator

Struct CoordinatorState 

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struct CoordinatorState {
    regions: HashMap<RegionId, RegionQueue>,
    ready_regions: BTreeSet<RegionId>,
    running: usize,
    closed: bool,
    dispatching: bool,
    virtual_time: u128,
    sequence: u64,
}
Expand description

Admission accounting shared by every region worker.

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§regions: HashMap<RegionId, RegionQueue>

Per-region service and ready units. Idle regions stay here until they are unloaded, so batch boundaries cannot erase their service debt.

§ready_regions: BTreeSet<RegionId>

Iteration scales with current ready regions, not a hash table’s peak capacity. Idle regions retain service debt in regions without participating in admission.

§running: usize

Units holding capacity from admission through their released future, including work that was authorized but never polled.

§closed: bool

Set by CompactionCoordinator::stop; later submissions are rejected.

§dispatching: bool

Non-recursive dispatch guard: only the current drainer admits and submits.

§virtual_time: u128

Monotonic floor of observed RegionQueue::service, in the same half-byte unit. It clamps a region that slept through a busy period.

§sequence: u64

Global admission tick. A larger value means a later admission; it breaks service ties and is unrelated to the WAL or row sequence.

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impl CoordinatorState

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fn admit(&mut self) -> Option<(RegionId, ReadyUnit, u128)>

Least-served selection charges bytes at admission, including jobs that have not started. A backlog can boost weight by at most two; no region can obtain unlimited weight. Positive byte cost prevents zero-sized work from monopolizing ties. Queue order retains the region’s fair picker priority.

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fn prune(&mut self, region_id: RegionId)

Trait Implementations§

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impl Default for CoordinatorState

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fn default() -> CoordinatorState

Returns the “default value” for a type. Read more

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