Struct UniversalCompactionOptions 

pub struct UniversalCompactionOptions {
    pub size_ratio: u32,
    pub min_merge_width: u32,
    pub max_merge_width: u32,
    pub max_size_amplification_percent: u32,
}

Tunables for CompactionStyle::Universal. Ignored when the style is not CompactionStyle::Universal.

Fields

size_ratio: u32

Percent tolerance used by the size-ratio merge rule. Walk the L0 files newest-first; accumulate files while the running total is within size_ratio percent of the next candidate’s size. When the accumulator hits UniversalCompactionOptions::min_merge_width files, the picker merges them into one new L0 file. A larger size_ratio groups more files per merge (lower write amplification, larger output); smaller is pickier. Must be greater than zero when universal compaction is selected. Default: 1 (percent).

min_merge_width: u32

Smallest number of files the size-ratio rule is willing to merge. Must be at least 2 when universal compaction is selected. Pass 2 for the most aggressive grouping. Default: 2.

max_merge_width: u32

Cap on the number of files a single size-ratio merge can consume. Must be >= UniversalCompactionOptions::min_merge_width when universal compaction is selected. u32::MAX disables the cap. Default: u32::MAX.

max_size_amplification_percent: u32

Size-amplification trigger, as a percent. When total_size_of_all_older_files * 100 / size_of_oldest_file exceeds this value, the picker forces a full merge of every L0 file into one run. Default: 200 (i.e., full merge fires once the accumulated non-oldest content is ~2× the oldest run). Must be greater than zero when universal compaction is selected.

Trait Implementations

impl Clone for UniversalCompactionOptions

fn clone(&self) -> UniversalCompactionOptions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for UniversalCompactionOptions

impl Debug for UniversalCompactionOptions

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

Formats the value using the given formatter.

impl Default for UniversalCompactionOptions

fn default() -> Self

Returns the “default value” for a type.

impl Eq for UniversalCompactionOptions

impl PartialEq for UniversalCompactionOptions

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for UniversalCompactionOptions