diff --git a/src/index_controller/update_actor.rs b/src/index_controller/update_actor.rs
index 384c52098..2f3c058bc 100644
--- a/src/index_controller/update_actor.rs
+++ b/src/index_controller/update_actor.rs
@@ -24,15 +24,15 @@ pub enum UpdateError {
 }
 
 enum UpdateMsg<D> {
-    CreateIndex{
-        uuid: Uuid,
-        ret: oneshot::Sender<Result<()>>,
-    },
     Update {
         uuid: Uuid,
         meta: UpdateMeta,
         data: mpsc::Receiver<PayloadData<D>>,
         ret: oneshot::Sender<Result<UpdateStatus>>
+    },
+    ListUpdates {
+        uuid: Uuid,
+        ret: oneshot::Sender<Result<Vec<UpdateStatus>>>,
     }
 }
 
@@ -58,12 +58,14 @@ where D: AsRef<[u8]> + Sized + 'static,
     }
 
     async fn run(mut self) {
+        use UpdateMsg::*;
+
         info!("started update actor.");
 
         loop {
             match self.inbox.recv().await {
-                Some(UpdateMsg::Update { uuid, meta, data, ret }) => self.handle_update(uuid, meta, data, ret).await,
-                Some(_) => {}
+                Some(Update { uuid, meta, data, ret }) => self.handle_update(uuid, meta, data, ret).await,
+                Some(ListUpdates { uuid, ret }) => self.handle_list_updates(uuid, ret).await,
                 None => {}
             }
         }
@@ -99,6 +101,10 @@ where D: AsRef<[u8]> + Sized + 'static,
             let _ = ret.send(result);
         }).await;
     }
+
+    async fn handle_list_updates(&self, uuid: Uuid, ret: oneshot::Sender<Result<Vec<UpdateStatus>>>) {
+        todo!()
+    }
 }
 
 #[derive(Clone)]
diff --git a/src/index_controller/update_store.rs b/src/index_controller/update_store.rs
index ae4bfb8d8..02c15ed8c 100644
--- a/src/index_controller/update_store.rs
+++ b/src/index_controller/update_store.rs
@@ -1,12 +1,12 @@
+use std::fs::remove_file;
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, RwLock};
-use std::fs::remove_file;
 
-use crossbeam_channel::Sender;
-use heed::types::{OwnedType, DecodeIgnore, SerdeJson};
-use heed::{EnvOpenOptions, Env, Database};
-use serde::{Serialize, Deserialize};
+use heed::types::{DecodeIgnore, OwnedType, SerdeJson};
+use heed::{Database, Env, EnvOpenOptions};
+use serde::{Deserialize, Serialize};
 use std::fs::File;
+use tokio::sync::mpsc;
 use uuid::Uuid;
 
 use crate::index_controller::updates::*;
@@ -22,17 +22,26 @@ pub struct UpdateStore<M, N, E> {
     failed_meta: Database<OwnedType<BEU64>, SerdeJson<Failed<M, E>>>,
     aborted_meta: Database<OwnedType<BEU64>, SerdeJson<Aborted<M>>>,
     processing: Arc<RwLock<Option<Processing<M>>>>,
-    notification_sender: Sender<()>,
+    notification_sender: mpsc::Sender<()>,
 }
 
 pub trait HandleUpdate<M, N, E> {
-    fn handle_update(&mut self, meta: Processing<M>, content: File) -> Result<Processed<M, N>, Failed<M, E>>;
+    fn handle_update(
+        &mut self,
+        meta: Processing<M>,
+        content: File,
+    ) -> Result<Processed<M, N>, Failed<M, E>>;
 }
 
 impl<M, N, E, F> HandleUpdate<M, N, E> for F
-where F: FnMut(Processing<M>, File) -> Result<Processed<M, N>, Failed<M, E>>
+where
+    F: FnMut(Processing<M>, File) -> Result<Processed<M, N>, Failed<M, E>>,
 {
-    fn handle_update(&mut self, meta: Processing<M>, content: File) -> Result<Processed<M, N>, Failed<M, E>> {
+    fn handle_update(
+        &mut self,
+        meta: Processing<M>,
+        content: File,
+    ) -> Result<Processed<M, N>, Failed<M, E>> {
         self(meta, content)
     }
 }
@@ -46,11 +55,11 @@ where
     pub fn open<P, U>(
         mut options: EnvOpenOptions,
         path: P,
-        mut update_handler: U,
+        update_handler: U,
     ) -> heed::Result<Arc<Self>>
     where
         P: AsRef<Path>,
-        U: HandleUpdate<M, N, E> + Send + 'static,
+        U: HandleUpdate<M, N, E> + Sync + Clone + Send + 'static,
     {
         options.max_dbs(5);
 
@@ -62,7 +71,7 @@ where
         let failed_meta = env.create_database(Some("failed-meta"))?;
         let processing = Arc::new(RwLock::new(None));
 
-        let (notification_sender, notification_receiver) = crossbeam_channel::bounded(1);
+        let (notification_sender, mut notification_receiver) = mpsc::channel(10);
         // Send a first notification to trigger the process.
         let _ = notification_sender.send(());
 
@@ -80,13 +89,19 @@ where
         // We need a weak reference so we can take ownership on the arc later when we
         // want to close the index.
         let update_store_weak = Arc::downgrade(&update_store);
-        std::thread::spawn(move || {
+        tokio::task::spawn(async move {
             // Block and wait for something to process.
-            'outer: for _ in notification_receiver {
+            'outer: while let Some(_) = notification_receiver.recv().await {
                 loop {
                     match update_store_weak.upgrade() {
                         Some(update_store) => {
-                            match update_store.process_pending_update(&mut update_handler) {
+                            let handler = update_handler.clone();
+                            let res = tokio::task::spawn_blocking(move || {
+                                update_store.process_pending_update(handler)
+                            })
+                            .await
+                            .unwrap();
+                            match res {
                                 Ok(Some(_)) => (),
                                 Ok(None) => break,
                                 Err(e) => eprintln!("error while processing update: {}", e),
@@ -108,17 +123,20 @@ where
 
     /// Returns the new biggest id to use to store the new update.
     fn new_update_id(&self, txn: &heed::RoTxn) -> heed::Result<u64> {
-        let last_pending = self.pending_meta
+        let last_pending = self
+            .pending_meta
             .remap_data_type::<DecodeIgnore>()
             .last(txn)?
             .map(|(k, _)| k.get());
 
-        let last_processed = self.processed_meta
+        let last_processed = self
+            .processed_meta
             .remap_data_type::<DecodeIgnore>()
             .last(txn)?
             .map(|(k, _)| k.get());
 
-        let last_aborted = self.aborted_meta
+        let last_aborted = self
+            .aborted_meta
             .remap_data_type::<DecodeIgnore>()
             .last(txn)?
             .map(|(k, _)| k.get());
@@ -154,21 +172,22 @@ where
 
         let meta = Pending::new(meta, update_id, index_uuid);
         self.pending_meta.put(&mut wtxn, &update_key, &meta)?;
-        self.pending.put(&mut wtxn, &update_key, &content.as_ref().to_owned())?;
+        self.pending
+            .put(&mut wtxn, &update_key, &content.as_ref().to_owned())?;
 
         wtxn.commit()?;
 
-        if let Err(e) = self.notification_sender.try_send(()) {
-            assert!(!e.is_disconnected(), "update notification channel is disconnected");
-        }
+        self.notification_sender
+            .blocking_send(())
+            .expect("Update store loop exited.");
         Ok(meta)
     }
     /// Executes the user provided function on the next pending update (the one with the lowest id).
     /// This is asynchronous as it let the user process the update with a read-only txn and
     /// only writing the result meta to the processed-meta store *after* it has been processed.
-    fn process_pending_update<U>(&self, handler: &mut U) -> heed::Result<Option<()>>
+    fn process_pending_update<U>(&self, mut handler: U) -> heed::Result<Option<()>>
     where
-        U: HandleUpdate<M, N, E> + Send + 'static,
+        U: HandleUpdate<M, N, E>,
     {
         // Create a read transaction to be able to retrieve the pending update in order.
         let rtxn = self.env.read_txn()?;
@@ -178,7 +197,8 @@ where
         // a reader while processing it, not a writer.
         match first_meta {
             Some((first_id, pending)) => {
-                let content_path = self.pending
+                let content_path = self
+                    .pending
                     .get(&rtxn, &first_id)?
                     .expect("associated update content");
 
@@ -186,10 +206,7 @@ where
                 // to the update handler. Processing store is non persistent to be able recover
                 // from a failure
                 let processing = pending.processing();
-                self.processing
-                    .write()
-                    .unwrap()
-                    .replace(processing.clone());
+                self.processing.write().unwrap().replace(processing.clone());
                 let file = File::open(&content_path)?;
                 // Process the pending update using the provided user function.
                 let result = handler.handle_update(processing, file);
@@ -199,10 +216,7 @@ where
                 // we must remove the content from the pending and processing stores and
                 // write the *new* meta to the processed-meta store and commit.
                 let mut wtxn = self.env.write_txn()?;
-                self.processing
-                    .write()
-                    .unwrap()
-                    .take();
+                self.processing.write().unwrap().take();
                 self.pending_meta.delete(&mut wtxn, &first_id)?;
                 remove_file(&content_path)?;
                 self.pending.delete(&mut wtxn, &first_id)?;
@@ -213,8 +227,8 @@ where
                 wtxn.commit()?;
 
                 Ok(Some(()))
-            },
-            None => Ok(None)
+            }
+            None => Ok(None),
         }
     }
 
@@ -241,7 +255,13 @@ where
         let failed_iter = self.failed_meta.iter(&rtxn)?;
 
         // We execute the user defined function with both iterators.
-        (f)(processing, processed_iter, aborted_iter, pending_iter, failed_iter)
+        (f)(
+            processing,
+            processed_iter,
+            aborted_iter,
+            pending_iter,
+            failed_iter,
+        )
     }
 
     /// Returns the update associated meta or `None` if the update doesn't exist.
@@ -340,22 +360,33 @@ mod tests {
     use std::time::{Duration, Instant};
 
     impl<M, N, F, E> HandleUpdate<M, N, E> for F
-        where F: FnMut(Processing<M>, &[u8]) -> Result<Processed<M, N>, Failed<M, E>> + Send + 'static {
-            fn handle_update(&mut self, meta: Processing<M>, content: &[u8]) -> Result<Processed<M, N>, Failed<M, E>> {
-                self(meta, content)
-            }
+    where
+        F: FnMut(Processing<M>, &[u8]) -> Result<Processed<M, N>, Failed<M, E>> + Send + 'static,
+    {
+        fn handle_update(
+            &mut self,
+            meta: Processing<M>,
+            content: &[u8],
+        ) -> Result<Processed<M, N>, Failed<M, E>> {
+            self(meta, content)
         }
+    }
 
     #[test]
     fn simple() {
         let dir = tempfile::tempdir().unwrap();
         let mut options = EnvOpenOptions::new();
         options.map_size(4096 * 100);
-        let update_store = UpdateStore::open(options, dir, |meta: Processing<String>, _content: &_| -> Result<_, Failed<_, ()>> {
-            let new_meta = meta.meta().to_string() + " processed";
-            let processed = meta.process(new_meta);
-            Ok(processed)
-        }).unwrap();
+        let update_store = UpdateStore::open(
+            options,
+            dir,
+            |meta: Processing<String>, _content: &_| -> Result<_, Failed<_, ()>> {
+                let new_meta = meta.meta().to_string() + " processed";
+                let processed = meta.process(new_meta);
+                Ok(processed)
+            },
+        )
+        .unwrap();
 
         let meta = String::from("kiki");
         let update = update_store.register_update(meta, &[]).unwrap();
@@ -374,12 +405,17 @@ mod tests {
         let dir = tempfile::tempdir().unwrap();
         let mut options = EnvOpenOptions::new();
         options.map_size(4096 * 100);
-        let update_store = UpdateStore::open(options, dir, |meta: Processing<String>, _content:&_| -> Result<_, Failed<_, ()>> {
-            thread::sleep(Duration::from_millis(400));
-            let new_meta = meta.meta().to_string() + "processed";
-            let processed = meta.process(new_meta);
-            Ok(processed)
-        }).unwrap();
+        let update_store = UpdateStore::open(
+            options,
+            dir,
+            |meta: Processing<String>, _content: &_| -> Result<_, Failed<_, ()>> {
+                thread::sleep(Duration::from_millis(400));
+                let new_meta = meta.meta().to_string() + "processed";
+                let processed = meta.process(new_meta);
+                Ok(processed)
+            },
+        )
+        .unwrap();
 
         let before_register = Instant::now();