Struct CompactionConfig 

pub struct CompactionConfig {

    pub max_bytes_for_level_base: u64,
    pub max_bytes_for_level_multiplier: u64,
    pub max_compaction_bytes: u64,
    pub sub_level_max_compaction_bytes: u64,
    pub level0_tier_compact_file_number: u64,
    pub target_file_size_base: u64,
    pub compaction_filter_mask: u32,
    pub max_sub_compaction: u32,
    pub level0_stop_write_threshold_sub_level_number: u64,
    pub level0_sub_level_compact_level_count: u32,
    pub level0_overlapping_sub_level_compact_level_count: u32,
    pub max_space_reclaim_bytes: u64,
    pub level0_max_compact_file_number: u64,
    pub tombstone_reclaim_ratio: u32,
    pub enable_emergency_picker: bool,
    pub max_level: u32,
    pub sst_allowed_trivial_move_min_size: u64,
    pub sst_allowed_trivial_move_max_count: u32,
    pub max_l0_compact_level_count: u32,
    pub disable_auto_group_scheduling: bool,
    pub max_overlapping_level_size: u64,
    pub emergency_level0_sst_file_count: u32,
    pub emergency_level0_sub_level_partition: u32,
    pub level0_stop_write_threshold_max_sst_count: u32,
    pub level0_stop_write_threshold_max_size: u64,
    pub enable_optimize_l0_interval_selection: bool,
    pub blocked_xor_filter_kv_count_threshold: Option<u64>,
    pub max_vnode_key_range_bytes: Option<u64>,
    pub sstable_filter_kind: Vec<String>,
    pub sstable_filter_layout: Vec<String>,
}

Fields

max_bytes_for_level_base: u64

max_bytes_for_level_multiplier: u64

max_compaction_bytes: u64

sub_level_max_compaction_bytes: u64

level0_tier_compact_file_number: u64

target_file_size_base: u64

compaction_filter_mask: u32

max_sub_compaction: u32

level0_stop_write_threshold_sub_level_number: u64

level0_sub_level_compact_level_count: u32

level0_overlapping_sub_level_compact_level_count: u32

max_space_reclaim_bytes: u64

level0_max_compact_file_number: u64

tombstone_reclaim_ratio: u32

enable_emergency_picker: bool

max_level: u32

sst_allowed_trivial_move_min_size: u64

sst_allowed_trivial_move_max_count: u32

max_l0_compact_level_count: u32

disable_auto_group_scheduling: bool

max_overlapping_level_size: u64

emergency_level0_sst_file_count: u32

emergency_level0_sub_level_partition: u32

level0_stop_write_threshold_max_sst_count: u32

level0_stop_write_threshold_max_size: u64

enable_optimize_l0_interval_selection: bool

blocked_xor_filter_kv_count_threshold: Option<u64>

KV-count threshold for using blocked xor filters when output filter layout is “auto”.

When sstable_filter_layout[level] is “auto”, compaction will build blocked xor filters if the estimated key count of one output SST exceeds this threshold. Otherwise it will build a single non-blocked xor filter for that output.

This is an output-SST-level heuristic. Older versions compared the threshold with the total key count of the whole compaction task, which could classify many small output SSTs as blocked only because they came from a large task. With the current heuristic, those outputs can be classified back to plain filters.

Note: shared-buffer flush does not read compaction group config, and always uses the built-in default threshold.

max_vnode_key_range_bytes: Option<u64>

sstable_filter_kind: Vec<String>

Per-level xor filter family for compaction output.

Index by LSM level: 0..=max_level. Note: L0 (index 0) is currently ignored by shared-buffer flush, which always uses “xor16”.

sstable_filter_layout: Vec<String>

Per-level xor filter layout for compaction output.

auto uses the kv-count heuristic; plain/normal forces non-blocked filters; blocked forces block-based filters. Explicit plain and blocked values ignore the kv-count threshold.

Index by LSM level: 0..=max_level. Note: L0 (index 0) is currently ignored by shared-buffer flush, which always uses “auto”.

Implementations

impl CompactionConfig

pub fn config_docs( name: String, docs: &mut BTreeMap<String, Vec<(String, String)>>, )

Trait Implementations

impl Clone for CompactionConfig

fn clone(&self) -> CompactionConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompactionConfig

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

Formats the value using the given formatter.

impl Default for CompactionConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for CompactionConfig

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for CompactionConfig

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

where __S: Serializer,

Serialize this value into the given Serde serializer.