Struct VersionControl

pub(crate) struct VersionControl {
    data: RwLock<VersionControlData>,
}

Controls metadata and sequence numbers for a region.

It manages metadata in a copy-on-write fashion. Any modification to a region’s metadata will generate a new Version.

Fields

data: RwLock<VersionControlData>

Implementations

impl VersionControl

pub(crate) fn new(version: Version) -> VersionControl

Returns a new VersionControl with specific version.

pub(crate) fn current(&self) -> VersionControlData

Returns current copy of data.

pub(crate) fn set_sequence_and_entry_id( &self, seq: SequenceNumber, entry_id: EntryId, )

Updates committed sequence and entry id.

pub(crate) fn committed_sequence(&self) -> SequenceNumber

Sequence number of last committed data.

pub(crate) fn freeze_mutable(&self) -> Result<()>

Freezes the mutable memtable if it is not empty.

pub(crate) fn alter_options(&self, options: RegionOptions)

Applies region option changes and generates a new version.

pub(crate) fn apply_edit( &self, edit: RegionEdit, memtables_to_remove: &[MemtableId], purger: FilePurgerRef, )

Apply edit to current version.

pub(crate) fn mark_dropped(&self, memtable_builder: &MemtableBuilderRef)

Mark all opened files as deleted and set the delete marker in VersionControlData

pub(crate) fn alter_schema( &self, metadata: RegionMetadataRef, builder: &MemtableBuilderRef, )

Alter schema of the region.

It replaces existing mutable memtable with a memtable that uses the new schema. Memtables of the version must be empty.

pub(crate) fn truncate( &self, truncated_entry_id: EntryId, truncated_sequence: SequenceNumber, memtable_builder: &MemtableBuilderRef, )

Truncate current version.

pub(crate) fn overwrite_current(&self, version: Arc<Version>)

Overwrites the current version with a new version.

Trait Implementations

impl Debug for VersionControl

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

Formats the value using the given formatter.