Enum rocks::advanced_options::CompactionPri

#[repr(C)]pub enum CompactionPri {
    ByCompensatedSize,
    OldestLargestSeqFirst,
    OldestSmallestSeqFirst,
    MinOverlappingRatio,
}

In Level-based comapction, it Determines which file from a level to be picked to merge to the next level. We suggest people try kMinOverlappingRatio first when you tune your database.

Variants

ByCompensatedSize

Slightly Priotize larger files by size compensated by #deletes

OldestLargestSeqFirst

First compact files whose data's latest update time is oldest. Try this if you only update some hot keys in small ranges.

OldestSmallestSeqFirst

First compact files whose range hasn't been compacted to the next level for the longest. If your updates are random across the key space, write amplification is slightly better with this option.

MinOverlappingRatio

First compact files whose ratio between overlapping size in next level and its size is the smallest. It in many cases can optimize write amplification.

Trait Implementations

impl Clone for CompactionPri

pub fn clone(&self) -> CompactionPri

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for CompactionPri

impl Debug for CompactionPri

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

Formats the value using the given formatter.

impl Eq for CompactionPri

impl Hash for CompactionPri

pub fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

pub fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl PartialEq<CompactionPri> for CompactionPri

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

This method tests for self and other values to be equal, and is used by ==.

#[must_use]pub fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl StructuralEq for CompactionPri

impl StructuralPartialEq for CompactionPri