Parallel indexing

crates/pile-dataset/src/dataset.rs

@@ -4,6 +4,7 @@ use pile_toolbox::cancelabletask::{CancelFlag, CancelableTaskError};
 use std::{collections::HashMap, io::ErrorKind, path::PathBuf, sync::Arc, time::Instant};
 use tantivy::{Executor, Index, IndexWriter, TantivyError, collector::TopDocs};
 use thiserror::Error;
+use tokio::task::JoinSet;
 use tokio_stream::{StreamExt, wrappers::ReceiverStream};
 use tracing::{debug, info, trace, warn};
 
@@ -189,7 +190,7 @@ impl Datasets {
 
 		std::fs::create_dir_all(&fts_tmp_dir).map_err(DatasetError::from)?;
 
-		let db_index = DbFtsIndex::new(&fts_tmp_dir, &self.config);
+		let db_index = Arc::new(DbFtsIndex::new(&fts_tmp_dir, &self.config));
 		let mut index = Index::create_in_dir(&fts_tmp_dir, db_index.schema.clone())
 			.map_err(DatasetError::from)?;
 		index.set_executor(Executor::multi_thread(10, "build-fts").map_err(DatasetError::from)?);
@@ -199,6 +200,25 @@ impl Datasets {
 		let mut total = 0u64;
 		let mut logged_at = Instant::now();
 
+		const CONCURRENCY: usize = 32;
+		let mut join_set = JoinSet::new();
+
+		let mut process = |key, result: Result<_, _>| -> Result<(), DatasetError> {
+			match result {
+				Ok(Some(doc)) => {
+					index_writer.add_document(doc).map_err(DatasetError::from)?;
+					total += 1;
+					if logged_at.elapsed().as_secs() >= 5 {
+						debug!("Indexed {total} documents so far");
+						logged_at = Instant::now();
+					}
+				}
+				Ok(None) => warn!("Skipping {key:?}, document is empty"),
+				Err(err) => warn!("Could not read {key:?}, skipping. {err}"),
+			}
+			Ok(())
+		};
+
 		for (name, dataset) in &self.sources {
 			info!("Loading source {name}");
 
@@ -211,24 +231,27 @@ impl Datasets {
 				}
 
 				let item = item_result.map_err(DatasetError::from)?;
+				let db = Arc::clone(&db_index);
+				join_set.spawn(async move {
 					let key = item.key();
+					let result = db.entry_to_document(&item).await;
+					(key, result)
+				});
 
-				match db_index.entry_to_document(&item).await {
-					Ok(Some(doc)) => {
-						index_writer.add_document(doc).map_err(DatasetError::from)?;
-						total += 1;
-						if logged_at.elapsed().as_secs() >= 5 {
-							debug!("Indexed {total} documents so far");
-							logged_at = Instant::now();
+				while join_set.len() >= CONCURRENCY {
+					match join_set.join_next().await {
+						Some(Ok((key, result))) => process(key, result)?,
+						Some(Err(e)) => warn!("Indexing task panicked: {e}"),
+						None => break,
 					}
 				}
-					Ok(None) => {
-						warn!("Skipping {key:?}, document is empty");
-					}
-					Err(err) => {
-						warn!("Could not read {key:?}, skipping. {err}");
 			}
 		}
+
+		while let Some(join_result) = join_set.join_next().await {
+			match join_result {
+				Ok((key, result)) => process(key, result)?,
+				Err(e) => warn!("Indexing task panicked: {e}"),
 			}
 		}