Struct SstFilter 

pub struct SstFilter(/* private fields */);

Implementations

impl SstFilter

pub fn new() -> Self

pub fn apply_filter(&mut self, meta: &mut MetaFile)

Phase 1: Apply the filter to the meta file and update the state in the filter.

pub fn apply_filter_collect(&mut self, meta: &MetaFile) -> FxHashSet<u32>

Like apply_filter but only updates the filter state without modifying the MetaFile. Returns the set of SST sequence numbers that should be removed from this meta file’s entries (they are superseded by a newer meta). Call meta.retain_entries(|seq| !obsolete.contains(&seq)) later to apply.

pub fn apply_and_get_remove(&mut self, meta: &MetaFile) -> bool

Phase 2: Check if the meta file can be removed based on the filter state after phase 1. Updates the filter state for the next meta file. Returns true if the meta file can be removed.

pub fn apply_and_get_remove_after_removing( &mut self, meta: &MetaFile, entries_to_remove: &FxHashSet<u32>, ) -> bool

Like apply_and_get_remove, but treats entries in entries_to_remove as already removed. Commit uses this while its in-memory mutations are deferred until after CURRENT is durable, so a newly-subsumed meta file can be retired in the same commit.

Trait Implementations

impl Default for SstFilter

fn default() -> Self

Returns the “default value” for a type.