pub struct TieredPolicy { /* private fields */ }Expand description
A single-pool byte budget for resident columns.
Each call to PagingPolicy::decide tries to reserve len_bytes from a
process-wide AtomicUsize pool. Success ⇒ PageDecision::Skip
(column kept resident); failure ⇒ PageDecision::Page (column spills
via the configured backend + codec). PagingPolicy::record credits
the bytes back on PageEvent::ResidentReleased.
§Why a single global pool
Earlier iterations used thread_local! per-worker accounting plus a
shared spill pool. That layout assumed each PagedColumn::Resident
would drop on the thread that received the grant — which is not
true in Materialize: columns move between Timely workers freely. A
cross-thread drop would credit the wrong worker’s local pool and drift
both budgets silently.
The single-atomic design sidesteps the issue entirely: credit goes back
to the same pool regardless of where the drop runs. A future
thread-aware policy is welcome to revive the tiered layout — it would
need either a SendColumn wrapper that pins the column to its
originating thread, or an explicit cross-thread credit channel keyed by
origin std::thread::ThreadId.
§Contention
Hot paths (decide, record) touch a single atomic via a
compare-exchange loop. Per-byte CAS is fine at current column
granularity; if profiles show contention we can switch to chunk-sized
reservations.
Implementations§
Source§impl TieredPolicy
impl TieredPolicy
Sourcepub fn new(total_budget: usize, backend: Backend, codec: Option<Codec>) -> Self
pub fn new(total_budget: usize, backend: Backend, codec: Option<Codec>) -> Self
Constructs a policy with total_budget bytes available for resident
columns. backend and codec are used for the
PageDecision::Page outcome when the pool is exhausted.
Sourcepub fn budget_remaining(&self) -> usize
pub fn budget_remaining(&self) -> usize
Returns the current remaining budget in bytes. Useful for metrics or tests.
Trait Implementations§
Source§impl PagingPolicy for TieredPolicy
impl PagingPolicy for TieredPolicy
Auto Trait Implementations§
impl !Freeze for TieredPolicy
impl RefUnwindSafe for TieredPolicy
impl Send for TieredPolicy
impl Sync for TieredPolicy
impl Unpin for TieredPolicy
impl UnsafeUnpin for TieredPolicy
impl UnwindSafe for TieredPolicy
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