Struct mz_persist_txn::txn_read::DataSnapshot

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pub struct DataSnapshot<T> { /* private fields */ }
Expand description

A token exchangeable for a data shard snapshot.

  • Invariant: latest_write <= as_of < empty_to
  • Invariant: (latest_write, empty_to) and (as_of, empty_to) have no unapplied writes (which means we can do an empty CaA of those times if we like).

Implementations§

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impl<T: Timestamp + Lattice + TotalOrder + Codec64> DataSnapshot<T>

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pub async fn snapshot_and_fetch<K, V, D>( &self, data_read: &mut ReadHandle<K, V, T, D> ) -> Result<Vec<((Result<K, String>, Result<V, String>), T, D)>, Since<T>>
where K: Debug + Codec + Ord, V: Debug + Codec + Ord, D: Semigroup + Codec64 + Send + Sync,

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pub async fn snapshot_cursor<K, V, D>( &self, data_read: &mut ReadHandle<K, V, T, D>, should_fetch_part: impl for<'a> Fn(Option<&'a LazyPartStats>) -> bool ) -> Result<Cursor<K, V, T, D>, Since<T>>
where K: Debug + Codec + Ord, V: Debug + Codec + Ord, D: Semigroup + Codec64 + Send + Sync,

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pub async fn snapshot_and_stream<K, V, D>( &self, data_read: &mut ReadHandle<K, V, T, D> ) -> Result<impl Stream<Item = ((Result<K, String>, Result<V, String>), T, D)>, Since<T>>
where K: Debug + Codec + Ord + Default, V: Debug + Codec + Ord + Default, D: Semigroup + Codec64 + Send + Sync,

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pub fn snapshot_stats<K, V, D, O>( &self, data_since: &SinceHandle<K, V, T, D, O> ) -> impl Future<Output = Result<SnapshotStats, Since<T>>> + Send + 'static
where K: Debug + Codec + Ord, V: Debug + Codec + Ord, D: Semigroup + Codec64 + Send + Sync, O: Opaque + Codec64,

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pub async fn snapshot_parts_stats<K, V, D>( &self, data_read: &mut ReadHandle<K, V, T, D> ) -> Result<SnapshotPartsStats, Since<T>>
where K: Debug + Codec + Ord, V: Debug + Codec + Ord, D: Semigroup + Codec64 + Send + Sync,

Trait Implementations§

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impl<T: Debug> Debug for DataSnapshot<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 DataSnapshot<T>
where T: Freeze,

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impl<T> RefUnwindSafe for DataSnapshot<T>
where T: RefUnwindSafe,

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

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

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

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impl<T> UnwindSafe for DataSnapshot<T>
where T: UnwindSafe,

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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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T, U> CastInto<U> for T
where U: CastFrom<T>,

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fn cast_into(self) -> U

Performs the cast.
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impl<R, O, T> CopyOnto<ConsecutiveOffsetPairs<R, O>> for T
where R: Region<Index = (usize, usize)>, O: OffsetContainer<usize>, T: CopyOnto<R>,

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fn copy_onto( self, target: &mut ConsecutiveOffsetPairs<R, O> ) -> <ConsecutiveOffsetPairs<R, O> as Region>::Index

Copy self into the target container, returning an index that allows to look up the corresponding read item.
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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> FutureExt for T

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fn with_context(self, otel_cx: Context) -> WithContext<Self>

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where U: From<T>,

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const ALIGN: usize = _

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