pub trait CacheTracker: Debug + Send + Sync {
fn has_persistent_state(&self) -> bool;
fn blocks_accessed(&self, blocks: Vec<BlockInfo>) { ... }
fn blocks_written(&self, blocks: Vec<WriteInfo>) { ... }
fn blocks_deleted(&self, blocks: Vec<BlockInfo>) { ... }
fn sort_ids(&self, ids: &mut [i64]) { ... }
fn retain_ids(&self, ids: &[i64]) { ... }
}
Expand description
tracks block reads and writes to provide info about which blocks to evict from the LRU cache
Required methods
fn has_persistent_state(&self) -> bool
fn has_persistent_state(&self) -> bool
indicate whether retain_ids
should be called on startup
Provided methods
fn blocks_accessed(&self, blocks: Vec<BlockInfo>)
fn blocks_accessed(&self, blocks: Vec<BlockInfo>)
called whenever blocks were accessed
note that this method will be called very frequently, on every block access. it is fire and forget, so it is perfectly ok to offload the writing to another thread.
fn blocks_written(&self, blocks: Vec<WriteInfo>)
fn blocks_written(&self, blocks: Vec<WriteInfo>)
called whenever blocks were written
note that this method will be called frequently, on every block write. it is fire and forget, so it is perfectly ok to offload the writing to another thread.
fn blocks_deleted(&self, blocks: Vec<BlockInfo>)
fn blocks_deleted(&self, blocks: Vec<BlockInfo>)
called whenever blocks have been deleted by gc.
sort ids by importance. More important ids should go to the end.
this will be called from inside gc
fn retain_ids(&self, ids: &[i64])
fn retain_ids(&self, ids: &[i64])
notification that only these ids should be retained
this will be called once during startup