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This commit is contained in:
Heikki Linnakangas
2021-09-07 17:49:21 +03:00
parent 9098f2159d
commit 6245702c7c
1 changed files with 6 additions and 6 deletions
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12
pageserver/src/layered_repository/layer_map.rs
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@@ -39,9 +39,9 @@ pub struct LayerMap {
/// All the layers keyed by segment tag
segs: HashMap<SegmentTag, SegEntry>,
/// All in-memory layers, ordered by 'oldest_pending_lsn' of each layer.
/// This allows easy access to the in-memory layer that contains the
/// oldest WAL record.
/// All in-memory layers, ordered by 'oldest_pending_lsn' and generation
/// of each layer. This allows easy access to the in-memory layer that
/// contains the oldest WAL record.
open_segs: BinaryHeap<OpenSegEntry>,
/// Generation number, used to distinguish newly inserted entries in the
@@ -61,13 +61,13 @@ struct SegEntry {
pub historic: BTreeMap<Lsn, Arc<dyn Layer>>,
}
/// Entry held LayerMap.open_segs, with boilerplate comparison
/// routines to implement a min-heap ordered by 'oldest_pending_lsn' and 'generation''
/// Entry held LayerMap.open_segs, with boilerplate comparison routines
/// to implement a min-heap ordered by 'oldest_pending_lsn' and 'generation'
///
/// Each entry also carries a generation number. It can be used to distinguish
/// entries with the same 'oldest_pending_lsn'.
struct OpenSegEntry {
pub oldest_pending_lsn: Lsn,
pub oldest_pending_lsn: Lsn, // copy of layer.get_oldest_pending_lsn()
pub generation: u64,
pub layer: Arc<InMemoryLayer>,
}