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use crate::{
config::{Configurable, WorkerConfig},
errors::ChromaError,
sysdb::sysdb::{GrpcSysDb, SysDb},
types::VectorQueryResult,
};
use async_trait::async_trait;
use k8s_openapi::api::node;
use num_bigint::BigInt;
use parking_lot::{
MappedRwLockReadGuard, RwLock, RwLockReadGuard, RwLockUpgradableReadGuard, RwLockWriteGuard,
};
use std::collections::HashMap;
use std::sync::Arc;
use uuid::Uuid;
use super::distributed_hnsw_segment::DistributedHNSWSegment;
use crate::types::{EmbeddingRecord, MetadataValue, Segment, SegmentScope, VectorEmbeddingRecord};
#[derive(Clone)]
pub(crate) struct SegmentManager {
inner: Arc<Inner>,
sysdb: Box<dyn SysDb>,
}
///
struct Inner {
vector_segments: RwLock<HashMap<Uuid, Box<DistributedHNSWSegment>>>,
collection_to_segment_cache: RwLock<HashMap<Uuid, Vec<Arc<Segment>>>>,
storage_path: Box<std::path::PathBuf>,
}
impl SegmentManager {
pub(crate) fn new(sysdb: Box<dyn SysDb>, storage_path: &std::path::Path) -> Self {
SegmentManager {
inner: Arc::new(Inner {
vector_segments: RwLock::new(HashMap::new()),
collection_to_segment_cache: RwLock::new(HashMap::new()),
storage_path: Box::new(storage_path.to_owned()),
}),
sysdb: sysdb,
}
}
pub(crate) async fn write_record(&mut self, record: Box<EmbeddingRecord>) {
let collection_id = record.collection_id;
let mut target_segment = None;
// TODO: don't assume 1:1 mapping between collection and segment
{
let segments = self.get_segments(&collection_id).await;
target_segment = match segments {
Ok(found_segments) => {
if found_segments.len() == 0 {
return; // TODO: handle no segment found
}
Some(found_segments[0].clone())
}
Err(_) => {
// TODO: throw an error and log no segment found
return;
}
};
}
let target_segment = match target_segment {
Some(segment) => segment,
None => {
// TODO: throw an error and log no segment found
return;
}
};
println!("Writing to segment id {}", target_segment.id);
let segment_cache = self.inner.vector_segments.upgradable_read();
match segment_cache.get(&target_segment.id) {
Some(segment) => {
segment.write_records(vec![record]);
}
None => {
let mut segment_cache = RwLockUpgradableReadGuard::upgrade(segment_cache);
let new_segment = DistributedHNSWSegment::from_segment(
&target_segment,
&self.inner.storage_path,
// TODO: Don't unwrap - throw an error
record.embedding.as_ref().unwrap().len(),
);
match new_segment {
Ok(new_segment) => {
new_segment.write_records(vec![record]);
segment_cache.insert(target_segment.id, new_segment);
}
Err(e) => {
println!("Failed to create segment error {}", e);
// TODO: fail and log an error - failed to create/init segment
}
}
}
}
}
pub(crate) async fn get_records(
&self,
segment_id: &Uuid,
ids: Vec<String>,
) -> Result<Vec<Box<VectorEmbeddingRecord>>, &'static str> {
// TODO: Load segment if not in cache
let segment_cache = self.inner.vector_segments.read();
match segment_cache.get(segment_id) {
Some(segment) => {
return Ok(segment.get_records(ids));
}
None => {
return Err("No segment found");
}
}
}
pub(crate) async fn query_vector(
&self,
segment_id: &Uuid,
vectors: &[f32],
k: usize,
include_vector: bool,
) -> Result<Vec<Box<VectorQueryResult>>, &'static str> {
let segment_cache = self.inner.vector_segments.read();
match segment_cache.get(segment_id) {
Some(segment) => {
let mut results = Vec::new();
let (ids, distances) = segment.query(vectors, k);
for (id, distance) in ids.iter().zip(distances.iter()) {
let fetched_vector = match include_vector {
true => Some(segment.get_records(vec![id.clone()])),
false => None,
};
let mut target_record = None;
if include_vector {
target_record = match fetched_vector {
Some(fetched_vectors) => {
if fetched_vectors.len() == 0 {
return Err("No vector found");
}
let mut target_vec = None;
for vec in fetched_vectors.into_iter() {
if vec.id == *id {
target_vec = Some(vec);
break;
}
}
target_vec
}
None => {
return Err("No vector found");
}
};
}
let ret_vec = match target_record {
Some(target_record) => Some(target_record.vector),
None => None,
};
let result = Box::new(VectorQueryResult {
id: id.to_string(),
seq_id: BigInt::from(0),
distance: *distance,
vector: ret_vec,
});
results.push(result);
}
return Ok(results);
}
None => {
return Err("No segment found");
}
}
}
async fn get_segments(
&mut self,
collection_uuid: &Uuid,
) -> Result<MappedRwLockReadGuard<Vec<Arc<Segment>>>, &'static str> {
let cache_guard = self.inner.collection_to_segment_cache.read();
// This lets us return a reference to the segments with the lock. The caller is responsible
// dropping the lock.
let segments = RwLockReadGuard::try_map(cache_guard, |cache| {
return cache.get(&collection_uuid);
});
match segments {
Ok(segments) => {
return Ok(segments);
}
Err(_) => {
// Data was not in the cache, so we need to get it from the database
// Drop the lock since we need to upgrade it
// Mappable locks cannot be upgraded, so we need to drop the lock and re-acquire it
// https://github.com/Amanieu/parking_lot/issues/83
drop(segments);
let segments = self
.sysdb
.get_segments(
None,
None,
Some(SegmentScope::VECTOR),
None,
Some(collection_uuid.clone()),
)
.await;
match segments {
Ok(segments) => {
let mut cache_guard = self.inner.collection_to_segment_cache.write();
let mut arc_segments = Vec::new();
for segment in segments {
arc_segments.push(Arc::new(segment));
}
cache_guard.insert(collection_uuid.clone(), arc_segments);
let cache_guard = RwLockWriteGuard::downgrade(cache_guard);
let segments = RwLockReadGuard::map(cache_guard, |cache| {
// This unwrap is safe because we just inserted the segments into the cache and currently,
// there is no way to remove segments from the cache.
return cache.get(&collection_uuid).unwrap();
});
return Ok(segments);
}
Err(e) => {
return Err("Failed to get segments for collection from SysDB");
}
}
}
}
}
}
#[async_trait]
impl Configurable for SegmentManager {
async fn try_from_config(worker_config: &WorkerConfig) -> Result<Self, Box<dyn ChromaError>> {
// TODO: Sysdb should have a dynamic resolution in sysdb
let sysdb = GrpcSysDb::try_from_config(worker_config).await;
let sysdb = match sysdb {
Ok(sysdb) => sysdb,
Err(err) => {
return Err(err);
}
};
let path = std::path::Path::new(&worker_config.segment_manager.storage_path);
Ok(SegmentManager::new(Box::new(sysdb), path))
}
}
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