Struct VersionSet

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pub struct VersionSet { /* private fields */ }

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Expand description

Manages multiple versions/snapshots of storage state.

Provides lock-free reads by allowing readers to hold references to older snapshots while compaction creates new versions.

Implementations§

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impl VersionSet

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pub fn new() -> Self

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Create a new version set with an empty initial snapshot

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pub fn acquire(&self) -> SnapshotGuard

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Acquire a snapshot for reading

Returns a guard that keeps the snapshot alive until dropped.

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pub fn install(&self, snapshot: Snapshot)

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Install a new snapshot

The old snapshot remains valid for existing readers.

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pub fn create_snapshot(&self, column_groups: Vec<Vec<ColumnGroupRef>>) -> u64

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Create and install a new snapshot with column groups

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pub fn cleanup(&self)

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Clean up old snapshots that have no readers

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pub fn current_version(&self) -> u64

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Get current version number

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pub fn active_count(&self) -> usize

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Get number of active snapshots (includes current)

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pub fn stats(&self) -> VersionSetStatsSnapshot

👎Deprecated:

Unused duplicate; live MVCC is mvcc_concurrent::ConcurrentMvcc + durable_storage::MvccMemTable. Scheduled for removal (Task 2 consolidation).

Get statistics snapshot

Trait Implementations§

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impl Default for VersionSet

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fn default() -> Self

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

Auto Trait Implementations§

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impl UnwindSafe for VersionSet

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

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

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fn borrow_mut(&mut self) -> &mut T

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impl<ST, DT> CastableFrom<ST, Initialized, Initialized> for DT
where ST: ?Sized, DT: ?Sized,

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impl<ST, DT> CastableFrom<ST, Uninit, Uninit> for DT
where ST: ?Sized, DT: ?Sized,

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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