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Improve SlotColumn's code comment. (#28447) 

Improve SlotColumn's code comment to include how
LedgerCleanupService manages the clean-up of a SlotColumn.
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Yueh-Hsuan Chiang 2022-10-18 23:50:22 -07:00 committed by GitHub
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ledger/src/blockstore_db.rs
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@ -627,6 +627,11 @@ pub trait ProtobufColumn: Column {
/// SlotColumn is a trait for slot-based column families. Its index is
/// essentially Slot (or more generally speaking, has a 1:1 mapping to Slot).
///
/// The clean-up of any LedgerColumn that implements SlotColumn is managed by
/// [`LedgerCleanupService`], which will periodically deprecate and purge
/// oldest entries that are older than the latest root in order to maintain the
/// configured --limit-ledger-size under the validator argument.
pub trait SlotColumn<Index = u64> {}
impl<T: SlotColumn> Column for T {