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update comment (#24108)

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Jeff Washington (jwash) 2022-04-04 11:06:01 -05:00 committed by GitHub
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11
runtime/src/accounts_index.rs
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@ -400,11 +400,16 @@ impl<T: IndexValue> PreAllocatedAccountMapEntry<T> {
#[derive(Debug)]
pub struct RootsTracker {
/// current set of roots alive in approx. the current epoch
/// Current roots where appendvecs or write cache has account data.
/// Constructed during load from snapshots.
/// Updated every time we add a new root or clean/shrink an append vec into irrelevancy.
/// Range is approximately the last N slots where N is # slots per epoch.
pub(crate) alive_roots: RollingBitField,
/// Set of roots approx. within the current epoch that are roots now or were roots at one point in time.
/// Set of roots that are roots now or were roots at one point in time.
/// Range is approximately the last N slots where N is # slots per epoch.
/// A root could remain here if all entries in the append vec at that root are cleaned/shrunk and there are no
/// more entries that slot. 'alive_roots' will no longer contain such roots.
/// more entries for that slot. 'alive_roots' will no longer contain such roots.
/// This is a superset of 'alive_roots'
pub(crate) historical_roots: RollingBitField,
uncleaned_roots: HashSet<Slot>,
previous_uncleaned_roots: HashSet<Slot>,