Enum mz_dataflow_types::client::controller::ReadPolicy
source · [−]pub enum ReadPolicy<T> {
ValidFrom(Antichain<T>),
LagWriteFrontier(Arc<dyn Fn(AntichainRef<'_, T>) -> Antichain<T> + Send + Sync>),
Multiple(Vec<ReadPolicy<T>>),
}
Expand description
Compaction policies for collections maintained by Controller
.
Variants
ValidFrom(Antichain<T>)
Maintain the collection as valid from this frontier onward.
LagWriteFrontier(Arc<dyn Fn(AntichainRef<'_, T>) -> Antichain<T> + Send + Sync>)
Maintain the collection as valid from a function of the write frontier.
This function will only be re-evaluated when the write frontier changes.
If the intended behavior is to change in response to external signals,
consider using the ValidFrom
variant to manually pilot compaction.
The Arc
makes the function cloneable.
Multiple(Vec<ReadPolicy<T>>)
Allows one to express multiple read policies, taking the least of the resulting frontiers.
Implementations
sourceimpl ReadPolicy<Timestamp>
impl ReadPolicy<Timestamp>
sourcepub fn lag_writes_by(lag: Timestamp) -> Self
pub fn lag_writes_by(lag: Timestamp) -> Self
Creates a read policy that lags the write frontier by the indicated amount, rounded down to a multiple of that amount.
The rounding down is done to reduce the number of changes the capability undergoes, with the thinking
being that if you are ok with lag
, then getting something between lag
and 2 x lag
should be ok.
sourceimpl<T: Timestamp> ReadPolicy<T>
impl<T: Timestamp> ReadPolicy<T>
pub fn frontier(&self, write_frontier: AntichainRef<'_, T>) -> Antichain<T>
Trait Implementations
sourceimpl<T: Clone> Clone for ReadPolicy<T>
impl<T: Clone> Clone for ReadPolicy<T>
sourcefn clone(&self) -> ReadPolicy<T>
fn clone(&self) -> ReadPolicy<T>
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
Auto Trait Implementations
impl<T> !RefUnwindSafe for ReadPolicy<T>
impl<T> Send for ReadPolicy<T> where
T: Send,
impl<T> Sync for ReadPolicy<T> where
T: Sync,
impl<T> Unpin for ReadPolicy<T> where
T: Unpin,
impl<T> !UnwindSafe for ReadPolicy<T>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> FutureExt for T
impl<T> FutureExt for T
sourcefn with_context(self, otel_cx: Context) -> WithContext<Self>
fn with_context(self, otel_cx: Context) -> WithContext<Self>
sourcefn with_current_context(self) -> WithContext<Self>
fn with_current_context(self) -> WithContext<Self>
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
sourcefn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
sourceimpl<T> IntoRequest<T> for T
impl<T> IntoRequest<T> for T
sourcefn into_request(self) -> Request<T>
fn into_request(self) -> Request<T>
Wrap the input message T
in a tonic::Request
sourceimpl<T> ProgressEventTimestamp for T where
T: Data + Debug + Any,
impl<T> ProgressEventTimestamp for T where
T: Data + Debug + Any,
sourceimpl<P, R> ProtoType<R> for P where
R: RustType<P>,
impl<P, R> ProtoType<R> for P where
R: RustType<P>,
sourcefn into_rust(self) -> Result<R, TryFromProtoError>
fn into_rust(self) -> Result<R, TryFromProtoError>
See RustType::from_proto
.
sourcefn from_rust(rust: &R) -> P
fn from_rust(rust: &R) -> P
See RustType::into_proto
.
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more