Integrate arroy with conversion capabilities

Cargo.lock

@@ -444,9 +444,9 @@ checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"
 
 [[package]]
 name = "arroy"
-version = "0.6.1"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08e6111f351d004bd13e95ab540721272136fd3218b39d3ec95a2ea1c4e6a0a6"
+checksum = "8578a72223dfa13dfd9fc144d15260d134361789ebdea9b16e85a511edc73c7d"
 dependencies = [
  "bytemuck",
  "byteorder",

crates/milli/Cargo.toml

@@ -87,7 +87,7 @@ rhai = { version = "1.22.2", features = [
     "no_time",
     "sync",
 ] }
-arroy = "0.6.1"
+arroy = "0.6.3"
 hannoy = "0.0.4"
 rand = "0.8.5"
 tracing = "0.1.41"
@@ -111,7 +111,11 @@ utoipa = { version = "5.4.0", features = [
     "openapi_extensions",
 ] }
 lru = "0.14.0"
-twox-hash = { version = "2.1.1", default-features = false, features = ["std", "xxhash3_64", "xxhash64"] }
+twox-hash = { version = "2.1.1", default-features = false, features = [
+    "std",
+    "xxhash3_64",
+    "xxhash64",
+] }
 
 [dev-dependencies]
 mimalloc = { version = "0.1.47", default-features = false }

crates/milli/src/progress.rs

@@ -5,6 +5,7 @@ use std::sync::atomic::{AtomicU32, AtomicUsize, Ordering};
 use std::sync::{Arc, RwLock};
 use std::time::{Duration, Instant};
 
+use enum_iterator::Sequence as _;
 use indexmap::IndexMap;
 use itertools::Itertools;
 use serde::Serialize;
@@ -95,6 +96,14 @@ impl Progress {
 
         durations.drain(..).map(|(name, duration)| (name, format!("{duration:.2?}"))).collect()
     }
+
+    // TODO: ideally we should expose the progress in a way that let arroy use it directly
+    pub(crate) fn update_progress_from_arroy(&self, progress: arroy::WriterProgress) {
+        self.update_progress(progress.main);
+        if let Some(sub) = progress.sub {
+            self.update_progress(sub);
+        }
+    }
 }
 
 /// Generate the names associated with the durations and push them.
@@ -291,3 +300,45 @@ impl<T: steppe::Step> Step for Compat<T> {
         self.0.total().try_into().unwrap_or(u32::MAX)
     }
 }
+
+impl Step for arroy::MainStep {
+    fn name(&self) -> Cow<'static, str> {
+        match self {
+            arroy::MainStep::PreProcessingTheItems => "pre processing the items",
+            arroy::MainStep::WritingTheDescendantsAndMetadata => {
+                "writing the descendants and metadata"
+            }
+            arroy::MainStep::RetrieveTheUpdatedItems => "retrieve the updated items",
+            arroy::MainStep::RetrievingTheTreeAndItemNodes => "retrieving the tree and item nodes",
+            arroy::MainStep::UpdatingTheTrees => "updating the trees",
+            arroy::MainStep::CreateNewTrees => "create new trees",
+            arroy::MainStep::WritingNodesToDatabase => "writing nodes to database",
+            arroy::MainStep::DeleteExtraneousTrees => "delete extraneous trees",
+            arroy::MainStep::WriteTheMetadata => "write the metadata",
+            arroy::MainStep::ConvertingHannoyToArroy => "converting hannoy to arroy",
+        }
+        .into()
+    }
+
+    fn current(&self) -> u32 {
+        *self as u32
+    }
+
+    fn total(&self) -> u32 {
+        Self::CARDINALITY as u32
+    }
+}
+
+impl Step for arroy::SubStep {
+    fn name(&self) -> Cow<'static, str> {
+        self.unit.into()
+    }
+
+    fn current(&self) -> u32 {
+        self.current.load(Ordering::Relaxed)
+    }
+
+    fn total(&self) -> u32 {
+        self.max
+    }
+}

crates/milli/src/update/upgrade/new_hannoy.rs

@@ -23,9 +23,9 @@ impl UpgradeIndex for Latest_V1_18_New_Hannoy {
             /// REMOVE THIS FILE, IMPLEMENT CONVERSION AS A SETTING CHANGE
             let quantized = config.config.quantized();
             let embedder_id = embedding_configs.embedder_id(wtxn, &config.name)?.unwrap();
-            let vector_store =
+            let mut vector_store =
                 VectorStore::new(backend, index.vector_store, embedder_id, quantized);
-            vector_store.convert_from_arroy(wtxn, progress.clone())?;
+            vector_store.change_backend(wtxn, progress.clone())?;
         }
 
         Ok(false)

crates/milli/src/vector/store.rs

@@ -173,7 +173,9 @@ impl VectorStore {
         }
     }
 
-    pub fn convert_from_arroy(&self, wtxn: &mut RwTxn, progress: Progress) -> crate::Result<()> {
+    pub fn change_backend(&mut self, wtxn: &mut RwTxn, progress: Progress) -> crate::Result<()> {
+        if self.backend == VectorStoreBackend::Arroy {
+            self.backend = VectorStoreBackend::Hannoy;
             if self.quantized {
                 let dimensions = self
                     .arroy_readers(wtxn, self.arroy_quantized_db())
@@ -211,6 +213,54 @@ impl VectorStore {
 
                 Ok(())
             }
+        } else {
+            self.backend = VectorStoreBackend::Arroy;
+
+            if self.quantized {
+                /// FIXME: make sure that all of the functions in the vector store can work both in arroy and hannoy
+                /// (the existing implementation was assuming that only reads could happen in arroy)
+                /// bonus points for making it harder to forget switching on arroy on hannoy when modifying the code
+                let dimensions = self
+                    .readers(wtxn, self.quantized_db())
+                    .next()
+                    .transpose()?
+                    .map(|reader| reader.dimensions());
+
+                let Some(dimensions) = dimensions else { return Ok(()) };
+
+                for index in vector_store_range_for_embedder(self.embedder_index) {
+                    let mut rng = rand::rngs::StdRng::from_entropy();
+                    let writer = arroy::Writer::new(self.arroy_quantized_db(), index, dimensions);
+                    let mut builder = writer.builder(&mut rng);
+                    let builder =
+                        builder.progress(|step| progress.update_progress_from_arroy(step));
+                    builder.prepare_hannoy_conversion(wtxn)?;
+                    builder.build(wtxn)?;
+                }
+
+                Ok(())
+            } else {
+                let dimensions = self
+                    .readers(wtxn, self.angular_db())
+                    .next()
+                    .transpose()?
+                    .map(|reader| reader.dimensions());
+
+                let Some(dimensions) = dimensions else { return Ok(()) };
+
+                for index in vector_store_range_for_embedder(self.embedder_index) {
+                    let mut rng = rand::rngs::StdRng::from_entropy();
+                    let writer = arroy::Writer::new(self.arroy_angular_db(), index, dimensions);
+                    let mut builder = writer.builder(&mut rng);
+                    let builder =
+                        builder.progress(|step| progress.update_progress_from_arroy(step));
+                    builder.prepare_hannoy_conversion(wtxn)?;
+                    builder.build(wtxn)?;
+                }
+
+                Ok(())
+            }
+        }
     }
 
     #[allow(clippy::too_many_arguments)]