pub struct KrabkaMetadataFetchResponse {
pub error_code: i16,
pub leader_hint: i64,
pub leader_epoch: i32,
pub log_start_offset: i64,
pub high_watermark: i64,
pub quorum_high_watermark: i64,
pub snapshot_id: Option<SnapshotId>,
pub records: Bytes,
}Fields§
§error_code: i160 means success. 1 means this node cannot serve, so read
leader_hint.
leader_hint: i64Leader id the responder believes is current. -1 means unknown.
leader_epoch: i32The responder’s quorum epoch. An observer sends it as the
CurrentLeaderEpoch of a KIP-595 FetchSnapshot, which the leader
checks against its own epoch.
log_start_offset: i64Lowest retained log offset on the responder.
high_watermark: i64Highest committed and applied log offset on the responder. This bounds the records it can serve, and on a follower it is clamped to that follower’s own log end.
quorum_high_watermark: i64Highest offset the quorum has committed, as the responder last heard it from the leader.
Every controller serves this API, not only the leader, so an observer
cannot read high_watermark as the quorum’s progress: a follower that
is itself catching up reports its own clamped watermark, and an
observer that has drawn level with that follower would measure zero lag
against a quorum thousands of records ahead. This field is what the
readiness probe measures against.
snapshot_id: Option<SnapshotId>The KIP-630 snapshot (end_offset, epoch) the observer must install
before it can resume fetching, set when fetch_offset is below
log_start_offset because the responder has pruned those records away.
This is the observer’s half of what FetchResponse.SnapshotId does for
a controller follower (KIP-595). Without it a restarted observer fetches
an offset the leader no longer holds, is served an empty slice, and
never makes progress.
records: BytesConcatenated Kafka RecordBatches, one for each committed log batch.
Empty whenever snapshot_id is set: the records the observer asked for
are gone, so there is nothing to serve from the log.
Implementations§
Trait Implementations§
Source§impl Clone for KrabkaMetadataFetchResponse
impl Clone for KrabkaMetadataFetchResponse
Source§fn clone(&self) -> KrabkaMetadataFetchResponse
fn clone(&self) -> KrabkaMetadataFetchResponse
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 KrabkaMetadataFetchResponse
impl Debug for KrabkaMetadataFetchResponse
impl Eq for KrabkaMetadataFetchResponse
impl StructuralPartialEq for KrabkaMetadataFetchResponse
Auto Trait Implementations§
impl !Freeze for KrabkaMetadataFetchResponse
impl RefUnwindSafe for KrabkaMetadataFetchResponse
impl Send for KrabkaMetadataFetchResponse
impl Sync for KrabkaMetadataFetchResponse
impl Unpin for KrabkaMetadataFetchResponse
impl UnsafeUnpin for KrabkaMetadataFetchResponse
impl UnwindSafe for KrabkaMetadataFetchResponse
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