Struct mz_persist_client::cfg::DynamicConfig

source ·
pub struct DynamicConfig {
    batch_builder_max_outstanding_parts: AtomicUsize,
    compaction_heuristic_min_inputs: AtomicUsize,
    compaction_heuristic_min_parts: AtomicUsize,
    compaction_heuristic_min_updates: AtomicUsize,
    compaction_memory_bound_bytes: AtomicUsize,
    gc_blob_delete_concurrency_limit: AtomicUsize,
    state_versions_recent_live_diffs_limit: AtomicUsize,
    usage_state_fetch_concurrency_limit: AtomicUsize,
}
Expand description

Persist configurations that can be dynamically updated.

Persist is expected to react to each of these such that updating the value returned by the function takes effect in persist (i.e. no caching it). This should happen “as promptly as reasonably possible” where that’s defined by the tradeoffs of complexity vs promptness. For example, we might use a consistent version of BLOB_TARGET_SIZE for the entirety of a single compaction call. However, it should never require a process restart for an update of these to take effect.

These are hooked up to LaunchDarkly. Specifically, LaunchDarkly configs are serialized into a mz_dyncfg::ConfigUpdates. In environmentd, these are applied directly via mz_dyncfg::ConfigUpdates::apply to the PersistConfig in crate::cache::PersistClientCache. There is one PersistClientCache per process, and every PersistConfig shares the same Arc<DynamicConfig>, so this affects all DynamicConfig usage in the process. The ConfigUpdates is also sent via the compute and storage command streams, which then apply it to all computed/storaged/clusterd processes as well.

Fields§

§batch_builder_max_outstanding_parts: AtomicUsize§compaction_heuristic_min_inputs: AtomicUsize§compaction_heuristic_min_parts: AtomicUsize§compaction_heuristic_min_updates: AtomicUsize§compaction_memory_bound_bytes: AtomicUsize§gc_blob_delete_concurrency_limit: AtomicUsize§state_versions_recent_live_diffs_limit: AtomicUsize§usage_state_fetch_concurrency_limit: AtomicUsize

Implementations§

source§

impl DynamicConfig

source

const LOAD_ORDERING: Ordering = Ordering::SeqCst

source

const STORE_ORDERING: Ordering = Ordering::SeqCst

source

pub fn batch_builder_max_outstanding_parts(&self) -> usize

The maximum number of parts (s3 blobs) that crate::batch::BatchBuilder will pipeline before back-pressuring crate::batch::BatchBuilder::add calls on previous ones finishing.

source

pub fn compaction_heuristic_min_inputs(&self) -> usize

In Compactor::compact_and_apply, we do the compaction (don’t skip it) if the number of inputs is at least this many. Compaction is performed if any of the heuristic criteria are met (they are OR’d).

source

pub fn compaction_heuristic_min_parts(&self) -> usize

In Compactor::compact_and_apply, we do the compaction (don’t skip it) if the number of batch parts is at least this many. Compaction is performed if any of the heuristic criteria are met (they are OR’d).

source

pub fn compaction_heuristic_min_updates(&self) -> usize

In Compactor::compact_and_apply, we do the compaction (don’t skip it) if the number of updates is at least this many. Compaction is performed if any of the heuristic criteria are met (they are OR’d).

source

pub fn compaction_memory_bound_bytes(&self) -> usize

The upper bound on compaction’s memory consumption. The value must be at least 4*blob_target_size. Increasing this value beyond the minimum allows compaction to merge together more runs at once, providing greater consolidation of updates, at the cost of greater memory usage.

source

pub fn gc_blob_delete_concurrency_limit(&self) -> usize

The maximum number of concurrent blob deletes during garbage collection.

source

pub fn state_versions_recent_live_diffs_limit(&self) -> usize

The # of diffs to initially scan when fetching the latest consensus state, to determine which requests go down the fast vs slow path. Should be large enough to fetch all live diffs in the steady-state, and small enough to query Consensus at high volume. Steady-state usage should accommodate readers that require seqno-holds for reasonable amounts of time, which to start we say is 10s of minutes.

This value ought to be defined in terms of NEED_ROLLUP_THRESHOLD to approximate when we expect rollups to be written and therefore when old states will be truncated by GC.

source

pub fn usage_state_fetch_concurrency_limit(&self) -> usize

The maximum number of concurrent state fetches during usage computation.

source

pub fn set_compaction_memory_bound_bytes(&self, val: usize)

Trait Implementations§

source§

impl Debug for DynamicConfig

source§

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

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

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

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

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T, U> CastInto<U> for T
where U: CastFrom<T>,

source§

fn cast_into(self) -> U

Performs the cast.
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> FutureExt for T

source§

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

Attaches the provided Context to this type, returning a WithContext wrapper. Read more
source§

fn with_current_context(self) -> WithContext<Self>

Attaches the current Context to this type, returning a WithContext wrapper. Read more
source§

impl<T> Instrument for T

source§

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

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

fn in_current_span(self) -> Instrumented<Self>

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

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

source§

fn into(self) -> U

Calls U::from(self).

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

source§

impl<T> IntoRequest<T> for T

source§

fn into_request(self) -> Request<T>

Wrap the input message T in a tonic::Request
source§

impl<Unshared, Shared> IntoShared<Shared> for Unshared
where Shared: FromUnshared<Unshared>,

source§

fn into_shared(self) -> Shared

Creates a shared type from an unshared type.
source§

impl<T> Pointable for T

source§

const ALIGN: usize = _

The alignment of pointer.
§

type Init = T

The type for initializers.
source§

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
source§

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
source§

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
source§

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
source§

impl<P, R> ProtoType<R> for P
where R: RustType<P>,

source§

impl<T> Same for T

§

type Output = T

Should always be Self
source§

impl<'a, S, T> Semigroup<&'a S> for T
where T: Semigroup<S>,

source§

fn plus_equals(&mut self, rhs: &&'a S)

The method of std::ops::AddAssign, for types that do not implement AddAssign.
source§

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

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
source§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

source§

fn vzip(self) -> V

source§

impl<T> WithSubscriber for T

source§

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
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,