Smaller batches for index counter propagation

src/block/repair.rs

@@ -53,6 +53,7 @@ impl Worker for RepairWorker {
 				// This is mostly because the Rust bindings for SQLite assume a worst-case scenario
 				// where SQLite is not compiled in thread-safe mode, so we have to wrap everything
 				// in a mutex (see db/sqlite_adapter.rs and discussion in PR #322).
+				// TODO: maybe do this with tokio::task::spawn_blocking ?
 				let mut batch_of_hashes = vec![];
 				let start_bound = match self.next_start.as_ref() {
 					None => Bound::Unbounded,

src/model/index_counter.rs

@@ -429,7 +429,8 @@ impl<T: CountedItem> Worker for IndexPropagatorWorker<T> {
 		};
 
 		if !self.buf.is_empty() {
-			let entries = self.buf.iter().map(|(_k, v)| v);
+			let entries_k = self.buf.keys().take(100).cloned().collect::<Vec<_>>();
+			let entries = entries_k.iter().map(|k| self.buf.get(k).unwrap());
 			if let Err(e) = self.index_counter.table.insert_many(entries).await {
 				self.errors += 1;
 				if self.errors >= 2 && *must_exit.borrow() {
@@ -441,7 +442,9 @@ impl<T: CountedItem> Worker for IndexPropagatorWorker<T> {
 				// things to go back to normal
 				return Err(e);
 			} else {
-				self.buf.clear();
+				for k in entries_k {
+					self.buf.remove(&k);
+				}
 				self.errors = 0;
 			}