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[FLINK-32076][checkpoint] Introduce non-blocking file pool to reuse f…
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62 changes: 62 additions & 0 deletions
62
...ain/java/org/apache/flink/runtime/checkpoint/filemerging/NonBlockingPhysicalFilePool.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.runtime.checkpoint.filemerging; | ||
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| import org.apache.flink.runtime.state.CheckpointedStateScope; | ||
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| import javax.annotation.Nonnull; | ||
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| import java.io.IOException; | ||
| import java.util.Queue; | ||
| import java.util.concurrent.ConcurrentLinkedQueue; | ||
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| /** | ||
| * A Non-Blocking {@link PhysicalFilePool} which will always provide usable physical file without | ||
| * blocking. It may create many physical files if {@link | ||
| * NonBlockingPhysicalFilePool#pollFile(FileMergingSnapshotManager.SubtaskKey, | ||
| * CheckpointedStateScope)} frequently. | ||
| */ | ||
| public class NonBlockingPhysicalFilePool extends PhysicalFilePool { | ||
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| public NonBlockingPhysicalFilePool( | ||
| long maxFileSize, PhysicalFile.PhysicalFileCreator physicalFileCreator) { | ||
| super(maxFileSize, physicalFileCreator); | ||
| } | ||
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| @Override | ||
| public boolean tryPutFile( | ||
| FileMergingSnapshotManager.SubtaskKey subtaskKey, PhysicalFile physicalFile) { | ||
| return physicalFile.getSize() < maxFileSize | ||
| && getFileQueue(subtaskKey, physicalFile.getScope()).offer(physicalFile); | ||
| } | ||
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| @Override | ||
| @Nonnull | ||
| public PhysicalFile pollFile( | ||
| FileMergingSnapshotManager.SubtaskKey subtaskKey, CheckpointedStateScope scope) | ||
| throws IOException { | ||
| PhysicalFile physicalFile = getFileQueue(subtaskKey, scope).poll(); | ||
| return physicalFile == null ? physicalFileCreator.perform(subtaskKey, scope) : physicalFile; | ||
| } | ||
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| @Override | ||
| protected Queue<PhysicalFile> createFileQueue() { | ||
| return new ConcurrentLinkedQueue<>(); | ||
| } | ||
| } |
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145 changes: 145 additions & 0 deletions
145
...ntime/src/main/java/org/apache/flink/runtime/checkpoint/filemerging/PhysicalFilePool.java
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| @@ -0,0 +1,145 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.runtime.checkpoint.filemerging; | ||
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| import org.apache.flink.runtime.state.CheckpointedStateScope; | ||
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| import javax.annotation.Nonnull; | ||
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| import java.io.Closeable; | ||
| import java.io.IOException; | ||
| import java.util.Map; | ||
| import java.util.Queue; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
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| /** A pool for reusing {@link PhysicalFile}. This implementation should be thread-safe. */ | ||
| public abstract class PhysicalFilePool implements Closeable { | ||
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| /** Types of supported physical file pool. */ | ||
| public enum Type { | ||
| BLOCKING, | ||
| NON_BLOCKING | ||
| } | ||
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| /** creator to create a physical file. */ | ||
| protected final PhysicalFile.PhysicalFileCreator physicalFileCreator; | ||
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| /** Max size for a physical file. */ | ||
| protected final long maxFileSize; | ||
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| /** Map maintaining queues of different subtasks for reusing shared physical files. */ | ||
| protected final Map<FileMergingSnapshotManager.SubtaskKey, Queue<PhysicalFile>> | ||
| sharedPhysicalFilePoolBySubtask; | ||
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| /** Queue maintaining exclusive physical files for reusing. */ | ||
| protected final Queue<PhysicalFile> exclusivePhysicalFilePool; | ||
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| public PhysicalFilePool( | ||
| long maxFileSize, PhysicalFile.PhysicalFileCreator physicalFileCreator) { | ||
| this.physicalFileCreator = physicalFileCreator; | ||
| this.maxFileSize = maxFileSize; | ||
| this.sharedPhysicalFilePoolBySubtask = new ConcurrentHashMap<>(); | ||
| this.exclusivePhysicalFilePool = createFileQueue(); | ||
| } | ||
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| /** | ||
| * Try to put a physical file into file pool. | ||
| * | ||
| * @param subtaskKey the key of current subtask. | ||
| * @param physicalFile target physical file. | ||
| * @return true if file is in the pool, false otherwise. | ||
| */ | ||
| public abstract boolean tryPutFile( | ||
| FileMergingSnapshotManager.SubtaskKey subtaskKey, PhysicalFile physicalFile) | ||
| throws IOException; | ||
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| /** | ||
| * Poll a physical file from the pool. | ||
| * | ||
| * @param subtaskKey the key of current subtask. | ||
| * @param scope the scope of the checkpoint. | ||
| * @return a physical file. | ||
| */ | ||
| @Nonnull | ||
| public abstract PhysicalFile pollFile( | ||
| FileMergingSnapshotManager.SubtaskKey subtaskKey, CheckpointedStateScope scope) | ||
| throws IOException; | ||
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| /** | ||
| * Create and return a file queue. | ||
| * | ||
| * @return a created file queue. | ||
| */ | ||
| protected abstract Queue<PhysicalFile> createFileQueue(); | ||
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| /** | ||
| * Get or create a file queue for specific subtaskKey and checkpoint scope. | ||
| * | ||
| * @param subtaskKey the key of current subtask. | ||
| * @param scope the scope of the checkpoint. | ||
| * @return an existing or created file queue. | ||
| */ | ||
| protected Queue<PhysicalFile> getFileQueue( | ||
| FileMergingSnapshotManager.SubtaskKey subtaskKey, CheckpointedStateScope scope) { | ||
| return CheckpointedStateScope.SHARED.equals(scope) | ||
| ? sharedPhysicalFilePoolBySubtask.computeIfAbsent( | ||
| subtaskKey, key -> createFileQueue()) | ||
| : exclusivePhysicalFilePool; | ||
| } | ||
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| /** | ||
| * Return whether the pool is empty or not. | ||
| * | ||
| * @return whether the pool is empty or not. | ||
| */ | ||
| public boolean isEmpty() { | ||
| return sharedPhysicalFilePoolBySubtask.isEmpty() && exclusivePhysicalFilePool.isEmpty(); | ||
| } | ||
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| /** | ||
| * Close files in shared file pool by subtaskKey and close all files in exclusive file pool. | ||
| * | ||
| * @param subtaskKey the key of current subtask. | ||
| * @throws IOException if anything goes wrong when closing files. | ||
| */ | ||
| public void close(FileMergingSnapshotManager.SubtaskKey subtaskKey) throws IOException { | ||
| if (sharedPhysicalFilePoolBySubtask.containsKey(subtaskKey)) { | ||
| closeFilesInQueue(sharedPhysicalFilePoolBySubtask.remove(subtaskKey)); | ||
| } | ||
| closeFilesInQueue(exclusivePhysicalFilePool); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| closeFilesInQueue(exclusivePhysicalFilePool); | ||
| for (Queue<PhysicalFile> queue : sharedPhysicalFilePoolBySubtask.values()) { | ||
| closeFilesInQueue(queue); | ||
| } | ||
| sharedPhysicalFilePoolBySubtask.clear(); | ||
| } | ||
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| private void closeFilesInQueue(Queue<PhysicalFile> queue) throws IOException { | ||
| while (!queue.isEmpty()) { | ||
| PhysicalFile physicalFile = queue.poll(); | ||
| if (physicalFile != null) { | ||
| physicalFile.close(); | ||
| } | ||
| } | ||
| } | ||
| } |
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