pub struct HydrationBurstStrategy;Expand description
The hydration-burst strategy.
Engaged for clusters whose AUTO SCALING STRATEGY sets ON HYDRATION. While
the cluster is On and there exists an object on it that no steady-state
(realized-config) replica has hydrated, it runs one extra replica at the
configured HYDRATION SIZE to accelerate hydration; the burst replica tears
down a linger_duration after the steady set first hydrates. Zero objects
make the condition vacuously unsatisfied, so a brand-new cluster never bursts
before its first object lands. The burst is keyed entirely on the presence of a
durable burst record (written/cleared by Strategy::update_state); the
burst replica is an ordinary replica. The union/diff reconciler creates and
drops it by shape+count with no special identity.
There is deliberately no TTL on the burst replica: if the steady set can never
hydrate at cluster.size, the burst stays up indefinitely (the cluster runs
permanently oversized, visible in billing and the audit log), the accepted
trade for keeping the cluster serving. Burst is not suppressed during a
reconfiguration; the two coexist.
Steady-replica hydration and object existence are live signals requested via
Strategy::signal_request while an ON HYDRATION policy is active.
Trait Implementations§
Source§impl Clone for HydrationBurstStrategy
impl Clone for HydrationBurstStrategy
Source§fn clone(&self) -> HydrationBurstStrategy
fn clone(&self) -> HydrationBurstStrategy
1.0.0 (const: unstable) · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moreSource§impl Debug for HydrationBurstStrategy
impl Debug for HydrationBurstStrategy
Source§impl Default for HydrationBurstStrategy
impl Default for HydrationBurstStrategy
Source§fn default() -> HydrationBurstStrategy
fn default() -> HydrationBurstStrategy
Source§impl Strategy for HydrationBurstStrategy
impl Strategy for HydrationBurstStrategy
Source§fn signal_request(
&self,
state: &ClusterState,
config: &ConfigSignals,
) -> SignalRequest
fn signal_request( &self, state: &ClusterState, config: &ConfigSignals, ) -> SignalRequest
state this tick,
declared as a pure function of the durable state and the tick’s config
signals. The kernel unions the requests across strategies, fetches them
through the ctx, and passes the result to Strategy::update_state and
Strategy::desired_replicas. The default requests nothing, which suits
a strategy that works off durable state alone (like the baseline).Source§fn update_state(
&self,
state: &ClusterState,
signals: &LiveSignals,
config: &ConfigSignals,
now: Timestamp,
) -> StateWrite
fn update_state( &self, state: &ClusterState, signals: &LiveSignals, config: &ConfigSignals, now: Timestamp, ) -> StateWrite
state at time now. The
default is no write, which suits a strategy that only ever contributes
replicas (like the baseline). An empty StateWrite means “write
nothing”: the kernel drops it without emitting a decision.Source§fn desired_replicas(
&self,
state: &ClusterState,
_signals: &LiveSignals,
_config: &ConfigSignals,
_now: Timestamp,
) -> Vec<DesiredReplica>
fn desired_replicas( &self, state: &ClusterState, _signals: &LiveSignals, _config: &ConfigSignals, _now: Timestamp, ) -> Vec<DesiredReplica>
state’s desired set at
time now.impl Copy for HydrationBurstStrategy
Auto Trait Implementations§
impl Freeze for HydrationBurstStrategy
impl RefUnwindSafe for HydrationBurstStrategy
impl Send for HydrationBurstStrategy
impl Sync for HydrationBurstStrategy
impl Unpin for HydrationBurstStrategy
impl UnsafeUnpin for HydrationBurstStrategy
impl UnwindSafe for HydrationBurstStrategy
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