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Add comment exlaining wanted_image_layers

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Konstantin Knizhnik
2023-02-22 22:44:14 +02:00
parent 4da24ba34f
commit c01c31d045
1 changed files with 8 additions and 0 deletions
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8
pageserver/src/tenant/timeline.rs
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@@ -121,6 +121,14 @@ pub struct Timeline {
pub pg_version: u32,
pub(super) layers: RwLock<LayerMap<dyn PersistentLayer>>,
//
// Set of key ranges which should be covered by image layers to
// allow GC to remove old layers. BTreeMap key is start of range (inclusive),
// value - end of range (exclusive). This map is constructed by GC
// (when it can not remove layer because it is not covered by image layers)
// and used by compaction when it checks if new image layer should be created.
//
wanted_image_layers: Mutex<Option<BTreeMap<Key, Key>>>,
last_freeze_at: AtomicLsn,