TanYuxin-tyx commented on code in PR #22804: URL: https://github.com/apache/flink/pull/22804#discussion_r1247346519
########## flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/hybrid/tiered/tier/disk/DiskCacheManager.java: ########## @@ -0,0 +1,174 @@ +/* + * 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.flink.runtime.io.network.partition.hybrid.tiered.tier.disk; + +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.runtime.io.network.buffer.Buffer; +import org.apache.flink.runtime.io.network.partition.hybrid.tiered.common.TieredStoragePartitionId; +import org.apache.flink.runtime.io.network.partition.hybrid.tiered.file.PartitionFileWriter; +import org.apache.flink.runtime.io.network.partition.hybrid.tiered.storage.TieredStorageMemoryManager; +import org.apache.flink.util.concurrent.FutureUtils; + +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.List; +import java.util.concurrent.CompletableFuture; + +/** + * The {@link DiskCacheManager} is responsible for managing cached buffers before flushing to files. + */ +class DiskCacheManager { + + private final TieredStoragePartitionId partitionId; + + private final int numSubpartitions; + + private final PartitionFileWriter partitionFileWriter; + + private final SubpartitionDiskCacheManager[] subpartitionCacheManagers; + + /** Whether the current flush process has completed. */ + private CompletableFuture<Void> hasFlushCompleted; + + DiskCacheManager( + TieredStoragePartitionId partitionId, + int numSubpartitions, + TieredStorageMemoryManager storageMemoryManager, + PartitionFileWriter partitionFileWriter) { + this.partitionId = partitionId; + this.numSubpartitions = numSubpartitions; + this.partitionFileWriter = partitionFileWriter; + this.subpartitionCacheManagers = new SubpartitionDiskCacheManager[numSubpartitions]; + this.hasFlushCompleted = FutureUtils.completedVoidFuture(); + + for (int subpartitionId = 0; subpartitionId < numSubpartitions; ++subpartitionId) { + subpartitionCacheManagers[subpartitionId] = new SubpartitionDiskCacheManager(); + } + storageMemoryManager.listenBufferReclaimRequest(this::notifyFlushCachedBuffers); + } + + // ------------------------------------------------------------------------ + // Called by DiskTierProducerAgent + // ------------------------------------------------------------------------ + + /** + * Append buffer to {@link DiskCacheManager}. + * + * @param buffer to be managed by this class. + * @param subpartitionId the subpartition of this record. + */ + void append(Buffer buffer, int subpartitionId) { + subpartitionCacheManagers[subpartitionId].append(buffer); + } + + /** + * Append the end-of-segment event to {@link DiskCacheManager}, which indicates the segment has + * finished. + * + * @param record the end-of-segment event + * @param subpartitionId target subpartition of this record. + * @param dataType the type of this record. In other words, is it data or event. + */ + void appendEndOfSegmentEvent(ByteBuffer record, int subpartitionId, Buffer.DataType dataType) { Review Comment: This should not be removed, because the previous comments show that the concept of end-of-segment need not be aware both in `SubpartitionDiskCacheManager` and `DiskProducerAgent`. I also think this makes sense. So the `Buffer.DataType` is to avoid composing the end-of-segment to `SubpartitionDiskCacheManager`. ########## flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/hybrid/tiered/tier/disk/SubpartitionDiskCacheManager.java: ########## @@ -0,0 +1,130 @@ +/* + * 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.flink.runtime.io.network.partition.hybrid.tiered.tier.disk; + +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.core.memory.MemorySegment; +import org.apache.flink.core.memory.MemorySegmentFactory; +import org.apache.flink.runtime.io.network.buffer.Buffer; +import org.apache.flink.runtime.io.network.buffer.Buffer.DataType; +import org.apache.flink.runtime.io.network.buffer.FreeingBufferRecycler; +import org.apache.flink.runtime.io.network.buffer.NetworkBuffer; + +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.Deque; +import java.util.LinkedList; +import java.util.List; + +import static org.apache.flink.util.Preconditions.checkArgument; +import static org.apache.flink.util.Preconditions.checkState; + +/** + * The {@link SubpartitionDiskCacheManager} is responsible to manage the cached buffers in a single + * subpartition. + */ +class SubpartitionDiskCacheManager { + + /** + * All the buffers. The first field of the tuple is the buffer, while the second field of the + * buffer is the buffer index. + * + * <p>Note that this field can be accessed by the task thread or the write IO thread, so the + * thread safety should be ensured. + */ + private final Deque<Tuple2<Buffer, Integer>> allBuffers = new LinkedList<>(); + + /** + * Record the buffer index in the {@link SubpartitionDiskCacheManager}. Each time a new buffer + * is added to the {@code allBuffers}, this field is increased by one. + */ + private int bufferIndex; + + /** + * Record the segment id that is writing to. Each time when the segment is finished, this filed + * is increased by one. + */ + private int segmentIndex; + + // ------------------------------------------------------------------------ + // Called by DiskCacheManager + // ------------------------------------------------------------------------ + + void append(Buffer buffer) { + addBuffer(buffer); + } + + void appendEndOfSegmentEvent(ByteBuffer record, DataType dataType) { + writeEvent(record, dataType); + segmentIndex++; + } + + /** Note that allBuffers can be touched by multiple threads. */ + List<Tuple2<Buffer, Integer>> removeAllBuffers() { + synchronized (allBuffers) { + List<Tuple2<Buffer, Integer>> targetBuffers = new ArrayList<>(allBuffers); + allBuffers.clear(); + return targetBuffers; + } + } + + int getBufferIndex() { + return bufferIndex; + } + + int getSegmentIndex() { + return segmentIndex; + } + + void release() { + recycleBuffers(); + checkState(allBuffers.isEmpty(), "Leaking buffers."); + } + + // ------------------------------------------------------------------------ + // Internal Methods + // ------------------------------------------------------------------------ + + private void writeEvent(ByteBuffer event, DataType dataType) { + checkArgument(dataType.isEvent()); + + MemorySegment data = MemorySegmentFactory.wrap(event.array()); + addBuffer(new NetworkBuffer(data, FreeingBufferRecycler.INSTANCE, dataType, data.size())); + } + + /** Note that allBuffers can be touched by multiple threads. */ Review Comment: Fixed. -- This is an automated message from the Apache Git Service. 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