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https://github.com/meilisearch/meilisearch.git
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Refactor ExternalDocumentsIds
- Remove soft deleted - Add apply method that takes a list of operations to encapsulate modifications to the external -> internal mapping
This commit is contained in:
Louis Dureuil
parent
5be569e3e2
commit
8fb221dae3
@ -7,133 +7,118 @@ use fst::map::IndexedValue;
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use fst::{IntoStreamer, Streamer};
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use roaring::RoaringBitmap;
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use crate::DocumentId;
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const DELETED_ID: u64 = u64::MAX;
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pub struct ExternalDocumentsIds<'a> {
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pub(crate) hard: fst::Map<Cow<'a, [u8]>>,
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pub(crate) soft: fst::Map<Cow<'a, [u8]>>,
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soft_deleted_docids: RoaringBitmap,
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pub enum DocumentOperationKind {
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Create,
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Delete,
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}
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pub struct DocumentOperation {
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pub external_id: String,
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pub internal_id: DocumentId,
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pub kind: DocumentOperationKind,
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}
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pub struct ExternalDocumentsIds<'a>(fst::Map<Cow<'a, [u8]>>);
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impl<'a> ExternalDocumentsIds<'a> {
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pub fn new(
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hard: fst::Map<Cow<'a, [u8]>>,
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soft: fst::Map<Cow<'a, [u8]>>,
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soft_deleted_docids: RoaringBitmap,
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) -> ExternalDocumentsIds<'a> {
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ExternalDocumentsIds { hard, soft, soft_deleted_docids }
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pub fn new(fst: fst::Map<Cow<'a, [u8]>>) -> ExternalDocumentsIds<'a> {
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ExternalDocumentsIds(fst)
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}
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pub fn into_static(self) -> ExternalDocumentsIds<'static> {
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ExternalDocumentsIds {
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hard: self.hard.map_data(|c| Cow::Owned(c.into_owned())).unwrap(),
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soft: self.soft.map_data(|c| Cow::Owned(c.into_owned())).unwrap(),
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soft_deleted_docids: self.soft_deleted_docids,
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}
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ExternalDocumentsIds(self.0.map_data(|c| Cow::Owned(c.into_owned())).unwrap())
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}
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/// Returns `true` if hard and soft external documents lists are empty.
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pub fn is_empty(&self) -> bool {
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self.hard.is_empty() && self.soft.is_empty()
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self.0.is_empty()
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}
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pub fn get<A: AsRef<[u8]>>(&self, external_id: A) -> Option<u32> {
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let external_id = external_id.as_ref();
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match self.soft.get(external_id).or_else(|| self.hard.get(external_id)) {
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Some(id) if id != DELETED_ID && !self.soft_deleted_docids.contains(id as u32) => {
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Some(id.try_into().unwrap())
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}
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_otherwise => None,
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}
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}
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/// Rebuild the internal FSTs in the ExternalDocumentsIds structure such that they
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/// don't contain any soft deleted document id.
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pub fn delete_soft_deleted_documents_ids_from_fsts(&mut self) -> fst::Result<()> {
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let mut new_hard_builder = fst::MapBuilder::memory();
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let union_op = self.hard.op().add(&self.soft).r#union();
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let mut iter = union_op.into_stream();
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while let Some((external_id, docids)) = iter.next() {
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// prefer selecting the ids from soft, always
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let id = indexed_last_value(docids).unwrap();
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if id != DELETED_ID && !self.soft_deleted_docids.contains(id as u32) {
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new_hard_builder.insert(external_id, id)?;
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}
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}
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drop(iter);
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// Delete soft map completely
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self.soft = fst::Map::default().map_data(Cow::Owned)?;
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// We save the new map as the new hard map.
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self.hard = new_hard_builder.into_map().map_data(Cow::Owned)?;
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Ok(())
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}
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pub fn insert_ids<A: AsRef<[u8]>>(&mut self, other: &fst::Map<A>) -> fst::Result<()> {
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let union_op = self.soft.op().add(other).r#union();
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let mut new_soft_builder = fst::MapBuilder::memory();
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let mut iter = union_op.into_stream();
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while let Some((external_id, marked_docids)) = iter.next() {
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let id = indexed_last_value(marked_docids).unwrap();
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new_soft_builder.insert(external_id, id)?;
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}
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drop(iter);
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// We save the new map as the new soft map.
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self.soft = new_soft_builder.into_map().map_data(Cow::Owned)?;
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self.merge_soft_into_hard()
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self.0.get(external_id).map(|x| x.try_into().unwrap())
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}
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/// An helper function to debug this type, returns an `HashMap` of both,
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/// soft and hard fst maps, combined.
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pub fn to_hash_map(&self) -> HashMap<String, u32> {
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let mut map = HashMap::new();
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let union_op = self.hard.op().add(&self.soft).r#union();
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let mut iter = union_op.into_stream();
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while let Some((external_id, marked_docids)) = iter.next() {
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let id = indexed_last_value(marked_docids).unwrap();
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if id != DELETED_ID {
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let external_id = str::from_utf8(external_id).unwrap();
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map.insert(external_id.to_owned(), id.try_into().unwrap());
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}
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let mut map = HashMap::default();
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let mut stream = self.0.stream();
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while let Some((k, v)) = stream.next() {
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let k = String::from_utf8(k.to_vec()).unwrap();
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map.insert(k, v.try_into().unwrap());
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}
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map
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}
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/// Return an fst of the combined hard and soft deleted ID.
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pub fn to_fst<'b>(&'b self) -> fst::Result<Cow<'b, fst::Map<Cow<'a, [u8]>>>> {
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if self.soft.is_empty() {
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return Ok(Cow::Borrowed(&self.hard));
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}
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let union_op = self.hard.op().add(&self.soft).r#union();
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let mut iter = union_op.into_stream();
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let mut new_hard_builder = fst::MapBuilder::memory();
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while let Some((external_id, marked_docids)) = iter.next() {
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let value = indexed_last_value(marked_docids).unwrap();
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if value != DELETED_ID {
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new_hard_builder.insert(external_id, value)?;
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}
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}
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drop(iter);
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Ok(Cow::Owned(new_hard_builder.into_map().map_data(Cow::Owned)?))
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pub fn as_bytes(&self) -> &[u8] {
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self.0.as_fst().as_bytes()
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}
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fn merge_soft_into_hard(&mut self) -> fst::Result<()> {
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if self.soft.len() >= self.hard.len() / 2 {
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self.hard = self.to_fst()?.into_owned();
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self.soft = fst::Map::default().map_data(Cow::Owned)?;
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}
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/// Apply the list of operations passed as argument, modifying the current external to internal id mapping.
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///
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/// If the list contains multiple operations on the same external id, then the result is unspecified.
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///
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/// # Panics
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///
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/// - If attempting to delete a document that doesn't exist
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/// - If attempting to create a document that already exists
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pub fn apply(&mut self, mut operations: Vec<DocumentOperation>) {
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operations.sort_unstable_by(|left, right| left.external_id.cmp(&right.external_id));
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operations.dedup_by(|left, right| left.external_id == right.external_id);
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Ok(())
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let mut builder = fst::MapBuilder::memory();
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let mut stream = self.0.stream();
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let mut next_stream = stream.next();
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let mut operations = operations.iter();
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let mut next_operation = operations.next();
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loop {
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(next_stream, next_operation) = match (next_stream.take(), next_operation.take()) {
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(None, None) => break,
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(None, Some(DocumentOperation { external_id, internal_id, kind })) => {
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if matches!(kind, DocumentOperationKind::Delete) {
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panic!("Attempting to delete a non-existing document")
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}
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builder.insert(external_id, (*internal_id).into()).unwrap();
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(None, operations.next())
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}
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(Some((k, v)), None) => {
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builder.insert(k, v).unwrap();
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(stream.next(), None)
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}
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(
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current_stream @ Some((left_external_id, left_internal_id)),
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current_operation @ Some(DocumentOperation {
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external_id: right_external_id,
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internal_id: right_internal_id,
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kind,
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}),
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) => match left_external_id.cmp(right_external_id.as_bytes()) {
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std::cmp::Ordering::Less => {
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builder.insert(left_external_id, left_internal_id).unwrap();
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(stream.next(), current_operation)
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}
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std::cmp::Ordering::Greater => {
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builder.insert(right_external_id, (*right_internal_id).into()).unwrap();
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(current_stream, operations.next())
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}
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std::cmp::Ordering::Equal => {
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if matches!(kind, DocumentOperationKind::Create) {
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panic!("Attempting to create an already-existing document");
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}
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// we delete the document, so we just advance both iterators to skip in stream
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(stream.next(), operations.next())
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}
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},
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}
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}
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self.0 = builder.into_map().map_data(Cow::Owned).unwrap();
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}
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}
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@ -145,11 +130,7 @@ impl fmt::Debug for ExternalDocumentsIds<'_> {
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impl Default for ExternalDocumentsIds<'static> {
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fn default() -> Self {
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ExternalDocumentsIds {
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hard: fst::Map::default().map_data(Cow::Owned).unwrap(),
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soft: fst::Map::default().map_data(Cow::Owned).unwrap(),
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soft_deleted_docids: RoaringBitmap::new(),
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}
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ExternalDocumentsIds(fst::Map::default().map_data(Cow::Owned).unwrap())
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}
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}
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