Module cache 

Cache types and configuration for runtime read paths. Consumed by loonfs, which owns the runtime’s cache configuration and stats, and which re-exports cache::Recency for the grep index’s own block cache.

Structs

MetadataTableCache

MetadataTableCacheConfig

MetadataTableCacheStats

NamespaceHeadSummary

Lightweight namespace head status.

Recency

A recency queue with lazy deletion.

WalTailProjectionCache

WalTailProjectionCacheConfig

Zero entries disables the cache; the row and byte limits bound what one entry may hold and what the cache may retain in total.

WalTailProjectionCacheKey

WalTailProjectionCacheStats

Enums

ManifestLoadError

ManifestLoadFailureClass

Coarse failure class of a manifest load: corruption versus store trouble.

Constants

DEFAULT_METADATA_TABLE_CACHE_DECODED_BYTES

Default decoded-byte budget for cached metadata table blocks. The byte budget is the only limit — one wide directory’s segment working set must fit, or warm listings re-fetch segments superlinearly — and zero disables the cache.

DEFAULT_WAL_TAIL_PROJECTION_DECODED_BYTES

DEFAULT_WAL_TAIL_PROJECTION_ROWS

Default bounds for WAL-tail projections, shared by the read-side projection cache and the publish-side tail reuse check.

Functions

load_deleted_namespace_head_summary

Summarizes a namespace whose head is a deletion tombstone.

load_namespace_head_summary