From e8795d2608326dff111098d64ea25b646ff4361c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Renault?= <clement@meilisearch.com>
Date: Sat, 14 Jun 2025 12:43:24 +0200
Subject: [PATCH] Export embeddings

---
 .../src/scheduler/process_export.rs           | 73 ++++++++++++++++++-
 1 file changed, 70 insertions(+), 3 deletions(-)

diff --git a/crates/index-scheduler/src/scheduler/process_export.rs b/crates/index-scheduler/src/scheduler/process_export.rs
index e01ddf2e4..1686472ab 100644
--- a/crates/index-scheduler/src/scheduler/process_export.rs
+++ b/crates/index-scheduler/src/scheduler/process_export.rs
@@ -1,13 +1,17 @@
 use std::collections::BTreeMap;
+use std::sync::atomic;
 use std::time::Duration;
 
 use meilisearch_types::index_uid_pattern::IndexUidPattern;
+use meilisearch_types::milli::constants::RESERVED_VECTORS_FIELD_NAME;
 use meilisearch_types::milli::progress::{Progress, VariableNameStep};
+use meilisearch_types::milli::vector::parsed_vectors::{ExplicitVectors, VectorOrArrayOfVectors};
 use meilisearch_types::milli::{obkv_to_json, Filter};
 use meilisearch_types::settings::{self, SecretPolicy};
 use meilisearch_types::tasks::ExportIndexSettings;
 use ureq::{json, Agent};
 
+use crate::processing::AtomicDocumentStep;
 use crate::{Error, IndexScheduler, Result};
 
 impl IndexScheduler {
@@ -92,19 +96,77 @@ impl IndexScheduler {
                 .embedding_configs(&index_rtxn)
                 .map_err(|e| Error::from_milli(e.into(), Some(uid.to_string())))?;
 
+            let total_documents = universe.len() as u32;
+            let (step, progress_step) = AtomicDocumentStep::new(total_documents);
+            progress.update_progress(progress_step);
+
             let limit = 50 * 1024 * 1024; // 50 MiB
             let mut buffer = Vec::new();
             let mut tmp_buffer = Vec::new();
-            for docid in universe {
+            for (i, docid) in universe.into_iter().enumerate() {
                 let document = index
                     .document(&index_rtxn, docid)
                     .map_err(|e| Error::from_milli(e, Some(uid.to_string())))?;
 
-                let value = obkv_to_json(&all_fields, &fields_ids_map, document)
+                let mut document = obkv_to_json(&all_fields, &fields_ids_map, document)
                     .map_err(|e| Error::from_milli(e, Some(uid.to_string())))?;
 
+                // TODO definitely factorize this code
+                if !*skip_embeddings {
+                    'inject_vectors: {
+                        let embeddings = index
+                            .embeddings(&index_rtxn, docid)
+                            .map_err(|e| Error::from_milli(e, Some(uid.to_string())))?;
+
+                        if embeddings.is_empty() {
+                            break 'inject_vectors;
+                        }
+
+                        let vectors = document
+                            .entry(RESERVED_VECTORS_FIELD_NAME)
+                            .or_insert(serde_json::Value::Object(Default::default()));
+
+                        let serde_json::Value::Object(vectors) = vectors else {
+                            return Err(Error::from_milli(
+                                meilisearch_types::milli::Error::UserError(
+                                    meilisearch_types::milli::UserError::InvalidVectorsMapType {
+                                        document_id: {
+                                            if let Ok(Some(Ok(index))) = index
+                                                .external_id_of(&index_rtxn, std::iter::once(docid))
+                                                .map(|it| it.into_iter().next())
+                                            {
+                                                index
+                                            } else {
+                                                format!("internal docid={docid}")
+                                            }
+                                        },
+                                        value: vectors.clone(),
+                                    },
+                                ),
+                                Some(uid.to_string()),
+                            ));
+                        };
+
+                        for (embedder_name, embeddings) in embeddings {
+                            let user_provided = embedding_configs
+                                .iter()
+                                .find(|conf| conf.name == embedder_name)
+                                .is_some_and(|conf| conf.user_provided.contains(docid));
+
+                            let embeddings = ExplicitVectors {
+                                embeddings: Some(VectorOrArrayOfVectors::from_array_of_vectors(
+                                    embeddings,
+                                )),
+                                regenerate: !user_provided,
+                            };
+                            vectors
+                                .insert(embedder_name, serde_json::to_value(embeddings).unwrap());
+                        }
+                    }
+                }
+
                 tmp_buffer.clear();
-                serde_json::to_writer(&mut tmp_buffer, &value)
+                serde_json::to_writer(&mut tmp_buffer, &document)
                     .map_err(meilisearch_types::milli::InternalError::from)
                     .map_err(|e| Error::from_milli(e.into(), Some(uid.to_string())))?;
 
@@ -114,9 +176,14 @@ impl IndexScheduler {
                     buffer.clear();
                 }
                 buffer.extend_from_slice(&tmp_buffer);
+
+                if i % 100 == 0 {
+                    step.fetch_add(100, atomic::Ordering::Relaxed);
+                }
             }
 
             post_serialized_documents(&agent, url, uid, api_key, &buffer).unwrap();
+            step.store(total_documents, atomic::Ordering::Relaxed);
         }
 
         Ok(())