Flaugh24 commented on code in PR #2390: URL: https://github.com/apache/ignite-3/pull/2390#discussion_r1291056487
########## modules/file-transfer/src/main/java/org/apache/ignite/internal/network/file/FileSender.java: ########## @@ -0,0 +1,227 @@ +/* + * 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. + */ + +package org.apache.ignite.internal.network.file; + +import static java.util.concurrent.CompletableFuture.allOf; +import static java.util.concurrent.CompletableFuture.completedFuture; +import static java.util.concurrent.CompletableFuture.failedFuture; +import static java.util.concurrent.CompletableFuture.supplyAsync; +import static org.apache.ignite.internal.network.file.Channel.FILE_TRANSFER_CHANNEL; + +import java.io.IOException; +import java.nio.file.Path; +import java.util.LinkedList; +import java.util.List; +import java.util.Queue; +import java.util.UUID; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Semaphore; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.stream.Collectors; +import org.apache.ignite.internal.network.file.exception.FileTransferException; +import org.apache.ignite.network.MessagingService; + +/** + * A class that sends files to a node. It uses a rate limiter to limit the bandwidth used. It also uses a thread pool to send the files in + * parallel. + */ +class FileSender { + private final int chunkSize; + + private final Semaphore rateLimiter; + + private final MessagingService messagingService; + + private final ExecutorService executorService; + + private final Queue<FileTransfer> requests = new LinkedList<>(); + + FileSender( + int chunkSize, + Semaphore rateLimiter, + MessagingService messagingService, + ExecutorService executorService + ) { + this.chunkSize = chunkSize; + this.rateLimiter = rateLimiter; + this.messagingService = messagingService; + this.executorService = executorService; + } + + /** + * Creates {@link FileTransfer} objects for each file and places them in the queue. The files will be sent when the rate limiter is + * available. + * + * @param targetNodeConsistentId The consistent ID of the node to send the files to. + * @param transferId The ID of the transfer. + * @param paths The paths of the files to send. + * @return A future that will be completed when the transfer is complete. + */ + CompletableFuture<Void> send(String targetNodeConsistentId, UUID transferId, List<Path> paths) { + // It doesn't make sense to continue file transfer if there is a failure in one of the files. + AtomicBoolean shouldBeCancelled = new AtomicBoolean(false); + + List<FileTransfer> transfers = paths.stream() + .map(path -> new FileTransfer(targetNodeConsistentId, transferId, path, shouldBeCancelled)) + .collect(Collectors.toList()); + + CompletableFuture[] results = transfers.stream() + .peek(this::processTransferAsync) + .map(it -> it.result) + .map(it -> it.whenComplete((v, e) -> { + if (e != null) { + shouldBeCancelled.set(true); + } + })) + .toArray(CompletableFuture[]::new); + + return allOf(results); + } + + /** + * Processes the given transfer. If the rate limiter is not available, the transfer will be processed later. + * + * @param transfer The transfer to process. + */ + private void processTransferAsync(FileTransfer transfer) { + synchronized (rateLimiter) { + if (rateLimiter.tryAcquire()) { + processTransferWithNextAsync(transfer); + } else { + requests.add(transfer); + } + } + } + + /** + * Process the given transfer and then process the next transfer if the rate limiter is available and there is a next transfer. + * + * @return A future that will be completed when the request is processed. + */ + private CompletableFuture<Void> processTransferWithNextAsync(FileTransfer transfer) { + return sendTransfer(transfer) + .thenComposeAsync(v -> { + synchronized (rateLimiter) { + FileTransfer nextTransfer = requests.poll(); + + // If there is a next transfer, process it. + // Otherwise, release the rate limiter. + if (nextTransfer != null) { + return processTransferWithNextAsync(nextTransfer); + } else { + rateLimiter.release(); + return completedFuture(null); + } + } + }, executorService); + } + + /** + * Sends the file to the node with the given consistent id. + * + * @param transfer The transfer to send. + * @return A future that will be completed when the file is sent. The future will be completed successfully always, even if the file is + * not sent. + */ + private CompletableFuture<Void> sendTransfer(FileTransfer transfer) { + return sendFile(transfer.receiverConsistentId, transfer.transferId, transfer.path, transfer.shouldBeCancelled) + .handle((v, e) -> { + if (e == null) { + transfer.result.complete(null); + } else { + transfer.result.completeExceptionally(e); + } + return null; + }); + } + + /** + * Sends the file to the node with the given consistent id. + * + * @param receiverConsistentId The consistent id of the node to send the file to. + * @param id The id of the file transfer. + * @param path The path of the file to send. + * @return A future that will be completed when the file is sent. + */ + private CompletableFuture<Void> sendFile(String receiverConsistentId, UUID id, Path path, AtomicBoolean shouldBeCancelled) { + if (path.toFile().length() == 0) { + return completedFuture(null); + } else { + return supplyAsync(() -> { + try { + return FileChunkMessagesStream.fromPath(chunkSize, id, path); + } catch (IOException e) { + throw new FileTransferException("Failed to create a file transfer stream", e); + } + }, executorService) + .thenCompose(stream -> { Review Comment: The current implementation limits the number of files that we send concurrently, so we have to wait for the finish of the transfer of one file to start another one. -- This is an automated message from the Apache Git Service. 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