Struct CompactionOutcome 

pub struct CompactionOutcome {
    pub reclaimed_pages: u64,
    pub segments_repacked: u32,
    pub file_bytes_freed: u64,
    pub reclaimed_segments: u64,
    pub segment_bytes_freed: u64,
}

Summary of what a StorageEngine::compact call reclaimed.

Lite-owned (not a pagedb type) so the trait doesn’t force pagedb types on non-pagedb impls. The pagedb-backed engine maps pagedb::CompactStats into this; other engines return the Default (all-zero) value from the trait’s default no-op compact.

Fields

reclaimed_pages: u64

Number of underlying pages reclaimed (moved to free-list or freed by repacking). Zero for engines with nothing to compact.

segments_repacked: u32

Number of segment files repacked.

file_bytes_freed: u64

Bytes truncated from the backing file by lowering the high-water mark.

reclaimed_segments: u64

Retired segment files reclaimed.

A segment replacement normally reclaims its predecessor as part of the commit, so this counts the remainder: segments whose retirement was deferred because a reader still pinned them, and files left behind by a process that died mid-retirement.

segment_bytes_freed: u64

Bytes freed by deleting tombstoned segment files.

Trait Implementations

impl Clone for CompactionOutcome

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for CompactionOutcome

impl Debug for CompactionOutcome

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for CompactionOutcome

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for CompactionOutcome

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for CompactionOutcome

impl PartialEq for CompactionOutcome

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for CompactionOutcome

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for CompactionOutcome