mz_storage_client::controller

Struct ExportState

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pub struct ExportState<T: TimelyTimestamp> {
    pub read_capabilities: MutableAntichain<T>,
    pub cluster_id: StorageInstanceId,
    pub derived_since: Antichain<T>,
    pub read_holds: [ReadHold<T>; 2],
    pub read_policy: ReadPolicy<T>,
    pub write_frontier: Antichain<T>,
}
Expand description

State maintained about individual exports.

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§read_capabilities: MutableAntichain<T>

Really only for keeping track of changes to the derived_since.

§cluster_id: StorageInstanceId

The cluster this export is associated with.

§derived_since: Antichain<T>

The current since frontier, derived from write_frontier using hold_policy.

§read_holds: [ReadHold<T>; 2]

The read holds that this export has on its dependencies (its input and itself). When the upper of the export changes, we downgrade this, which in turn downgrades holds we have on our dependencies’ sinces.

§read_policy: ReadPolicy<T>

The policy to use to downgrade self.read_capability.

§write_frontier: Antichain<T>

Reported write frontier.

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impl<T: Timestamp> ExportState<T>

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pub fn new( cluster_id: StorageInstanceId, read_hold: ReadHold<T>, self_hold: ReadHold<T>, write_frontier: Antichain<T>, read_policy: ReadPolicy<T>, ) -> Self
where T: Lattice,

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pub fn cluster_id(&self) -> StorageInstanceId

Returns the cluster to which the export is bound.

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pub fn input_hold(&self) -> &ReadHold<T>

Returns the cluster to which the export is bound.

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pub fn is_dropped(&self) -> bool

Returns whether the export was dropped.

Trait Implementations§

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impl<T: Debug + TimelyTimestamp> Debug for ExportState<T>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<T> Freeze for ExportState<T>
where T: Freeze,

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impl<T> !RefUnwindSafe for ExportState<T>

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impl<T> Send for ExportState<T>

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impl<T> Sync for ExportState<T>
where T: Sync,

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

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impl<T> !UnwindSafe for ExportState<T>

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