pub struct ConsumerFetchHandle { /* private fields */ }Expand description
Cloneable, concurrency-safe handle for fetching data batches from
object storage given a BatchDescriptor.
The handle holds an Arc<dyn ObjectStore> and the manifest path
(used as a metric label only). It carries no manifest cursor and
no mutable state, so it is safe to clone into many fetch worker
tasks while the owning Consumer keeps &mut-only access to
manifest operations (next_descriptors, ack, ack_through,
flush).
See RFC 0003 (“Concurrency Model”) for the full contract.
Implementations§
Source§impl ConsumerFetchHandle
impl ConsumerFetchHandle
Sourcepub async fn fetch(&self, descriptor: BatchDescriptor) -> Result<ConsumedBatch>
pub async fn fetch(&self, descriptor: BatchDescriptor) -> Result<ConsumedBatch>
Fetch and decode the batch identified by descriptor. Stateless
— does not consult or mutate manifest state. Safe to call
concurrently from multiple tasks (against the same handle clone
or distinct clones); two calls against the same descriptor
produce identical ConsumedBatch values.
The handle does not detect epoch fencing on its own; a fenced
consumer’s Consumer::next_descriptors is what surfaces
Error::Fenced. Fetches against descriptors handed out before
fencing succeed against object storage as long as the data
object is still present (i.e. before GC runs).
Trait Implementations§
Source§impl Clone for ConsumerFetchHandle
impl Clone for ConsumerFetchHandle
Source§fn clone(&self) -> ConsumerFetchHandle
fn clone(&self) -> ConsumerFetchHandle
1.0.0 (const: unstable) · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moreAuto Trait Implementations§
impl Freeze for ConsumerFetchHandle
impl !RefUnwindSafe for ConsumerFetchHandle
impl Send for ConsumerFetchHandle
impl Sync for ConsumerFetchHandle
impl Unpin for ConsumerFetchHandle
impl UnsafeUnpin for ConsumerFetchHandle
impl !UnwindSafe for ConsumerFetchHandle
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