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layerdesc: move descriptions from Layer

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This commit is contained in:
Joonas Koivunen
2023-08-22 00:38:25 +03:00
parent 3151ac637c
commit ddc3c71f82
1 changed files with 11 additions and 4 deletions
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15
pageserver/src/tenant/storage_layer/layer_desc.rs
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@@ -19,14 +19,21 @@ use serde::{Deserialize, Serialize};
pub struct PersistentLayerDesc {
pub tenant_id: TenantId,
pub timeline_id: TimelineId,
/// Range of keys that this layer covers
pub key_range: Range<Key>,
/// For image layer, this is `[lsn, lsn+1)`.
/// Inclusive start bound of the LSN range that this layer holds
/// Exclusive end bound of the LSN range that this layer holds.
///
/// - For an open in-memory layer, this is MAX_LSN.
/// - For a frozen in-memory layer or a delta layer, this is a valid end bound.
/// - An image layer represents snapshot at one LSN, so end_lsn is always the snapshot LSN + 1
pub lsn_range: Range<Lsn>,
/// Whether this is a delta layer.
pub is_delta: bool,
/// Whether this layer only contains page images for part of the keys in the range. In the current implementation, this should
/// always be equal to `is_delta`. If we land the partial image layer PR someday, image layer could also be
/// incremental.
/// Does this layer only contain some data for the key-range (incremental),
/// or does it contain a version of every page? This is important to know
/// for garbage collecting old layers: an incremental layer depends on
/// the previous non-incremental layer.
pub is_incremental: bool,
/// File size
pub file_size: u64,