Struct mz_storage_controller::instance::Instance

source ·

pub(crate) struct Instance<T> {
    replicas: BTreeMap<ReplicaId, Replica<T>>,
    active_ingestions: BTreeSet<GlobalId>,
    history: CommandHistory<T>,
    epoch: ClusterStartupEpoch,
    metrics: InstanceMetrics,
    now: NowFn,
    response_tx: UnboundedSender<StorageResponse<T>>,
}

Expand description

A controller for a storage instance.

Encapsulates communication with replicas in this instance, and their rehydration.

Note that storage objects (sources and sinks) don’t currently support replication (database-issues#5051). An instance can have muliple replicas connected, but only if it has no storage objects installed. Attempting to install storage objects on multi-replica instances, or attempting to add more than one replica to instances that have storage objects installed, is illegal and will lead to panics.

Fields§

§replicas: BTreeMap<ReplicaId, Replica<T>>

The replicas connected to this storage instance.

§active_ingestions: BTreeSet<GlobalId>

The ingestions currently running on this instance.

While this is derivable from history on demand, keeping a denormalized list of running ingestions is quite a bit more convenient in the implementation of StorageController::active_ingestions.

§history: CommandHistory<T>

The command history, used to replay past commands when introducing new replicas or reconnecting to existing replicas.

§epoch: ClusterStartupEpoch

The current cluster startup epoch.

The replica value of the epoch is increased every time a replica is (re)connected, allowing the distinction of different replica incarnations.

§metrics: InstanceMetrics

Metrics tracked for this storage instance.

§now: NowFn

A function that returns the current time.

§response_tx: UnboundedSender<StorageResponse<T>>

A sender for responses from replicas.

Struct mz_storage_controller::instance::InstanceCopy item path

Fields§

Implementations§

impl<T> Instance<T>where T: Timestamp + Lattice, StorageGrpcClient: StorageClient<T>,

pub fn new( envd_epoch: NonZeroI64, metrics: InstanceMetrics, now: NowFn, instance_response_tx: UnboundedSender<StorageResponse<T>>, ) -> Self

pub fn replica_ids(&self) -> impl Iterator<Item = ReplicaId> + '_

pub fn add_replica(&mut self, id: ReplicaId, config: ReplicaConfig)

§Panics

pub fn drop_replica(&mut self, id: ReplicaId)

pub fn rehydrate_failed_replicas(&mut self)

pub fn active_ingestions(&self) -> &BTreeSet<GlobalId>

fn update_paused_statuses(&mut self)

pub fn send(&mut self, command: StorageCommand<T>)

§Panics

Trait Implementations§

impl<T: Debug> Debug for Instance<T>

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

Auto Trait Implementations§

impl<T> Freeze for Instance<T>

impl<T> !RefUnwindSafe for Instance<T>

impl<T> Send for Instance<T>where T: Send,

impl<T> Sync for Instance<T>where T: Send + Sync,

impl<T> Unpin for Instance<T>where T: Unpin,

impl<T> !UnwindSafe for Instance<T>

Blanket Implementations§

impl<T> Any for Twhere T: 'static + ?Sized,

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Struct mz_storage_controller::instance::Instance

impl<T> Instance<T>
where T: Timestamp + Lattice, StorageGrpcClient: StorageClient<T>,

impl<T> Send for Instance<T>
where T: Send,

impl<T> Sync for Instance<T>
where T: Send + Sync,

impl<T> Unpin for Instance<T>
where T: Unpin,

impl<T> Any for T
where T: 'static + ?Sized,

impl<T> Borrow<T> for T
where T: ?Sized,

impl<T> BorrowMut<T> for T
where T: ?Sized,

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where U: CastFrom<T>,

fn conv<T>(self) -> T
where Self: Into<T>,

fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

fn fmt_display(self) -> FmtDisplay<Self>
where Self: Display,

fn fmt_lower_exp(self) -> FmtLowerExp<Self>
where Self: LowerExp,

fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

fn fmt_octal(self) -> FmtOctal<Self>
where Self: Octal,

fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

fn fmt_upper_hex(self) -> FmtUpperHex<Self>
where Self: UpperHex,

fn fmt_list(self) -> FmtList<Self>
where &'a Self: for<'a> IntoIterator,

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where U: From<T>,

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where Shared: FromUnshared<Unshared>,

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where U: OverrideFrom<T>,

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where T: ?Sized,

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where Self: Sized,

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