Merge #4597

4597: Fix embeddings settings update r=ManyTheFish a=ManyTheFish

# Pull Request
- add some conditions reducing the work done when changing the settings
- add some benchmarks on embedders

## Related issue
Fixes #4585


Co-authored-by: ManyTheFish <many@meilisearch.com>

milli/src/update/index_documents/extract/extract_vector_points.rs

@@ -198,11 +198,16 @@ pub fn extract_vector_points<R: io::Read + io::Seek>(
 
                 if document_is_kept {
                     // Don't give up if the old prompt was failing
-                    let old_prompt = prompt
+                    let old_prompt = Some(prompt)
-                        .render(obkv, DelAdd::Deletion, old_fields_ids_map)
+                        // TODO: this filter works because we erase the vec database when a embedding setting changes.
-                        .unwrap_or_default();
+                        // When vector pipeline will be optimized, this should be removed.
+                        .filter(|_| !settings_diff.reindex_vectors())
+                        .map(|p| {
+                            p.render(obkv, DelAdd::Deletion, old_fields_ids_map).unwrap_or_default()
+                        });
                     let new_prompt = prompt.render(obkv, DelAdd::Addition, new_fields_ids_map)?;
-                    if old_prompt != new_prompt {
+                    if old_prompt.as_ref() != Some(&new_prompt) {
+                        let old_prompt = old_prompt.unwrap_or_default();
                         tracing::trace!(
                             "🚀 Changing prompt from\n{old_prompt}\n===to===\n{new_prompt}"
                         );
@@ -224,6 +229,7 @@ pub fn extract_vector_points<R: io::Read + io::Seek>(
             &mut manual_vectors_writer,
             &mut key_buffer,
             delta,
+            settings_diff,
         )?;
     }
 
@@ -264,10 +270,15 @@ fn push_vectors_diff(
     manual_vectors_writer: &mut Writer<BufWriter<File>>,
     key_buffer: &mut Vec<u8>,
     delta: VectorStateDelta,
+    settings_diff: &InnerIndexSettingsDiff,
 ) -> Result<()> {
     puffin::profile_function!();
     let (must_remove, prompt, (mut del_vectors, mut add_vectors)) = delta.into_values();
-    if must_remove {
+    if must_remove
+    // TODO: the below condition works because we erase the vec database when a embedding setting changes.
+    // When vector pipeline will be optimized, this should be removed.
+    && !settings_diff.reindex_vectors()
+    {
         key_buffer.truncate(TRUNCATE_SIZE);
         remove_vectors_writer.insert(&key_buffer, [])?;
     }
@@ -295,6 +306,9 @@ fn push_vectors_diff(
         match eob {
             EitherOrBoth::Both(_, _) => (), // no need to touch anything
             EitherOrBoth::Left(vector) => {
+                // TODO: the below condition works because we erase the vec database when a embedding setting changes.
+                // When vector pipeline will be optimized, this should be removed.
+                if !settings_diff.reindex_vectors() {
                     // We insert only the Del part of the Obkv to inform
                     // that we only want to remove all those vectors.
                     let mut obkv = KvWriterDelAdd::memory();
@@ -302,6 +316,7 @@ fn push_vectors_diff(
                     let bytes = obkv.into_inner()?;
                     manual_vectors_writer.insert(&key_buffer, bytes)?;
                 }
+            }
             EitherOrBoth::Right(vector) => {
                 // We insert only the Add part of the Obkv to inform
                 // that we only want to remove all those vectors.

workloads/movies-subset-hf-embeddings.json

@@ -0,0 +1,68 @@
+{
+  "name": "movies-subset-hf-embeddings",
+  "run_count": 5,
+  "extra_cli_args": [
+    "--max-indexing-threads=4"
+  ],
+  "assets": {
+    "movies-100.json": {
+      "local_location": null,
+      "remote_location": "https://milli-benchmarks.fra1.digitaloceanspaces.com/bench/datasets/movies-100.json",
+      "sha256": "d215e395e4240f12f03b8f1f68901eac82d9e7ded5b462cbf4a6b8efde76c6c6"
+    }
+  },
+  "commands": [
+    {
+      "route": "experimental-features",
+      "method": "PATCH",
+      "body": {
+        "inline": {
+          "vectorStore": true
+        }
+      },
+      "synchronous": "DontWait"
+    },
+    {
+      "route": "indexes/movies/settings",
+      "method": "PATCH",
+      "body": {
+        "inline": {
+          "searchableAttributes": [
+            "title",
+            "overview"
+          ],
+          "filterableAttributes": [
+            "genres",
+            "release_date"
+          ],
+          "sortableAttributes": [
+            "release_date"
+          ]
+        }
+      },
+      "synchronous": "WaitForTask"
+    },
+    {
+      "route": "indexes/movies/settings",
+      "method": "PATCH",
+      "body": {
+        "inline": {
+          "embedders": {
+            "default": {
+              "source": "huggingFace"
+            }
+          }
+        }
+      },
+      "synchronous": "WaitForTask"
+    },
+    {
+      "route": "indexes/movies/documents",
+      "method": "POST",
+      "body": {
+        "asset": "movies-100.json"
+      },
+      "synchronous": "WaitForTask"
+    }
+  ]
+}

workloads/settings-add-embeddings.json

@@ -0,0 +1,72 @@
+{
+  "name": "settings-add-embeddings-hf",
+  "run_count": 5,
+  "extra_cli_args": [
+    "--max-indexing-threads=4"
+  ],
+  "assets": {
+    "movies-100.json": {
+      "local_location": null,
+      "remote_location": "https://milli-benchmarks.fra1.digitaloceanspaces.com/bench/datasets/movies-100.json",
+      "sha256": "d215e395e4240f12f03b8f1f68901eac82d9e7ded5b462cbf4a6b8efde76c6c6"
+    }
+  },
+  "commands": [
+    {
+      "route": "experimental-features",
+      "method": "PATCH",
+      "body": {
+        "inline": {
+          "vectorStore": true
+        }
+      },
+      "synchronous": "DontWait"
+    },
+    {
+      "route": "indexes/movies/settings",
+      "method": "PATCH",
+      "body": {
+        "inline": {
+          "searchableAttributes": [
+            "title",
+            "overview"
+          ],
+          "filterableAttributes": [
+            "genres",
+            "release_date"
+          ],
+          "sortableAttributes": [
+            "release_date"
+          ]
+        }
+      },
+      "synchronous": "DontWait"
+    },
+    {
+      "route": "indexes/movies/documents",
+      "method": "POST",
+      "body": {
+        "asset": "movies-100.json"
+      },
+      "synchronous": "WaitForTask"
+    },
+    {
+      "route": "indexes/movies/settings",
+      "method": "PATCH",
+      "body": {
+        "inline": {
+          "embedders": {
+            "default": {
+              "source": "huggingFace",
+              "model": null,
+              "revision": null,
+              "documentTemplate": null,
+              "distribution": null
+            }
+          }
+        }
+      },
+      "synchronous": "WaitForTask"
+    }
+  ]
+}