Struct lsm_tree::BlockCache

pub struct BlockCache { /* private fields */ }

Block cache, in which blocks are cached in-memory after being retrieved from disk

This speeds up consecutive queries to nearby data, improving read performance for hot data.

Examples

Sharing block cache between multiple trees

// Provide 10'000 blocks 40 MB of cache capacity
let block_cache = Arc::new(BlockCache::with_capacity_bytes(40 * 1_000 * 1_000));

let tree1 = Config::new(folder).block_cache(block_cache.clone()).open()?;
let tree2 = Config::new(folder).block_cache(block_cache.clone()).open()?;

Implementations

impl BlockCache

pub fn with_capacity_bytes(bytes: u64) -> Self

Creates a new block cache with roughly n bytes of capacity

pub fn capacity(&self) -> u64

Returns the cache capacity in bytes

pub fn len(&self) -> usize

Returns the number of cached blocks

pub fn is_empty(&self) -> bool

Returns true if there are no cached blocks