linguoxuan commented on code in PR #216: URL: https://github.com/apache/fluss-rust/pull/216#discussion_r2750502608
########## crates/fluss/src/client/lookup/lookup_client.rs: ########## @@ -0,0 +1,203 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +//! Lookup client that batches multiple lookups together for improved throughput. +//! +//! This client achieves parity with the Java client by: +//! - Queuing lookup operations instead of sending them immediately +//! - Batching multiple lookups to the same server/bucket +//! - Running a background sender task to process batches + +use super::{LookupQuery, LookupQueue}; +use crate::client::lookup::lookup_sender::LookupSender; +use crate::client::metadata::Metadata; +use crate::config::Config; +use crate::error::{Error, Result}; +use crate::metadata::{TableBucket, TablePath}; +use log::{debug, error}; +use std::sync::Arc; +use std::sync::atomic::{AtomicBool, Ordering}; +use std::time::Duration; +use tokio::sync::mpsc; +use tokio::task::JoinHandle; + +/// A client that lookups values from the server with batching support. +/// +/// The lookup client uses a queue and background sender to batch multiple +/// lookup operations together, reducing network round trips and improving +/// throughput. +/// +/// # Example +/// +/// ```ignore +/// let lookup_client = LookupClient::new(config, metadata); +/// let result = lookup_client.lookup(table_path, table_bucket, key_bytes).await?; +/// ``` +pub struct LookupClient { + /// Channel to send lookup requests to the queue + lookup_tx: mpsc::Sender<LookupQuery>, + /// Handle to the sender task + sender_handle: Option<JoinHandle<()>>, + /// Shutdown signal sender + shutdown_tx: mpsc::Sender<()>, + /// Whether the client is closed + closed: AtomicBool, +} + +impl LookupClient { + /// Creates a new lookup client. + pub fn new(config: &Config, metadata: Arc<Metadata>) -> Self { + // Extract configuration values + let queue_size = config.lookup_queue_size; + let max_batch_size = config.lookup_max_batch_size; + let batch_timeout_ms = config.lookup_batch_timeout_ms; + let max_inflight = config.lookup_max_inflight_requests; + let max_retries = config.lookup_max_retries; + + // Create queue and channels + let (queue, lookup_tx, re_enqueue_tx) = + LookupQueue::new(queue_size, max_batch_size, batch_timeout_ms); + + // Create sender + let mut sender = + LookupSender::new(metadata, queue, re_enqueue_tx, max_inflight, max_retries); + + // Create shutdown channel + let (shutdown_tx, mut shutdown_rx) = mpsc::channel(1); + + // Spawn sender task + let sender_handle = tokio::spawn(async move { + tokio::select! { + _ = sender.run() => { + debug!("Lookup sender completed"); + } + _ = shutdown_rx.recv() => { + debug!("Lookup sender received shutdown signal"); + sender.initiate_close(); + } + } + }); + + Self { + lookup_tx, + sender_handle: Some(sender_handle), + shutdown_tx, + closed: AtomicBool::new(false), + } + } + + /// Looks up a value by its primary key. + /// + /// This method queues the lookup operation and returns a future that will + /// complete when the server responds. Multiple lookups may be batched together + /// for improved throughput. + /// + /// # Arguments + /// * `table_path` - The table path + /// * `table_bucket` - The table bucket + /// * `key_bytes` - The encoded primary key bytes + /// + /// # Returns + /// * `Ok(Some(bytes))` - The value bytes if found + /// * `Ok(None)` - If the key was not found + /// * `Err(Error)` - If the lookup fails + pub async fn lookup( + &self, + table_path: TablePath, + table_bucket: TableBucket, + key_bytes: Vec<u8>, Review Comment: Fix it. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
