Struct Segment

pub struct Segment(/* private fields */);

Disk segment (a.k.a. SSTable, SST, sorted string table) that is located on disk

A segment is an immutable list of key-value pairs, split into compressed blocks. A reference to the block (block handle) is saved in the “block index”.

Deleted entries are represented by tombstones.

Segments can be merged together to improve read performance and reduce disk space by removing outdated item versions.

Implementations

impl Segment

pub fn version_factor(&self) -> f32

Calculates how many versions per key there are on average.

pub fn age(&self) -> u128

Gets the segment age in nanoseconds.

pub fn global_id(&self) -> GlobalSegmentId

Gets the global segment ID.

pub fn id(&self) -> SegmentId

Gets the segment ID.

The segment ID is unique for this tree, but not across multiple trees, use Segment::global_id for that.

pub fn bloom_filter_size(&self) -> usize

Gets the bloom filter size

pub fn get( &self, key: &[u8], seqno: Option<SeqNo>, hash: CompositeHash, ) -> Result<Option<InternalValue>>

pub fn is_key_in_key_range(&self, key: &[u8]) -> bool

pub fn get_highest_seqno(&self) -> SeqNo

Returns the highest sequence number in the segment.

Trait Implementations

impl Clone for Segment

fn clone(&self) -> Segment

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Segment

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

Formats the value using the given formatter.

impl Deref for Segment

type Target = Inner

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.