Struct tantivy::merge_policy::LogMergePolicy

pub struct LogMergePolicy { /* private fields */ }

LogMergePolicy tries to merge segments that have a similar number of documents.

Implementations

impl LogMergePolicy

pub fn set_min_num_segments(&mut self, min_num_segments: usize)

Set the minimum number of segments that may be merged together.

pub fn set_max_docs_before_merge(&mut self, max_docs_merge_size: usize)

Set the maximum number docs in a segment for it to be considered for merging. A segment can still reach more than max_docs, by merging many smaller ones.

pub fn set_min_layer_size(&mut self, min_layer_size: u32)

Set the minimum segment size under which all segment belong to the same level.

pub fn set_level_log_size(&mut self, level_log_size: f64)

Set the ratio between two consecutive levels.

Segments are grouped in levels according to their sizes. These levels are defined as intervals of exponentially growing sizes. level_log_size define the factor by which one should multiply the limit to reach a level, in order to get the limit to reach the following level.

pub fn set_del_docs_ratio_before_merge(
    &mut self,
    del_docs_ratio_before_merge: f32
)

Set the ratio of deleted documents in a segment to tolerate.

If it is exceeded by any segment at a log level, a merge will be triggered for that level.

If there is a single segment at a level, we effectively end up expunging deleted documents from it.

Panics

Panics if del_docs_ratio_before_merge is not within (0..1].

Trait Implementations

impl Clone for LogMergePolicy

fn clone(&self) -> LogMergePolicy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for LogMergePolicy

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

Formats the value using the given formatter.

impl Default for LogMergePolicy

fn default() -> LogMergePolicy

Returns the “default value” for a type.

impl MergePolicy for LogMergePolicy

fn compute_merge_candidates(
    &self,
    segments: &[SegmentMeta]
) -> Vec<MergeCandidate>

Given the list of segment metas, returns the list of merge candidates.