liangyepianzhou commented on code in PR #18273: URL: https://github.com/apache/pulsar/pull/18273#discussion_r1099611429
########## pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/SnapshotSegmentAbortedTxnProcessorImpl.java: ########## @@ -0,0 +1,758 @@ +/* + * 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.pulsar.broker.transaction.buffer.impl; + +import io.netty.buffer.ByteBuf; +import io.netty.buffer.Unpooled; +import java.util.ArrayList; +import java.util.LinkedList; +import java.util.List; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.ConcurrentLinkedDeque; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.TimeoutException; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicLong; +import java.util.concurrent.atomic.AtomicReferenceFieldUpdater; +import java.util.function.Supplier; +import lombok.extern.slf4j.Slf4j; +import org.apache.bookkeeper.mledger.AsyncCallbacks; +import org.apache.bookkeeper.mledger.Entry; +import org.apache.bookkeeper.mledger.ManagedLedgerException; +import org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl; +import org.apache.bookkeeper.mledger.impl.PositionImpl; +import org.apache.bookkeeper.mledger.impl.ReadOnlyManagedLedgerImpl; +import org.apache.commons.collections4.map.LinkedMap; +import org.apache.commons.lang3.tuple.MutablePair; +import org.apache.commons.lang3.tuple.Pair; +import org.apache.pulsar.broker.service.BrokerServiceException; +import org.apache.pulsar.broker.service.persistent.PersistentTopic; +import org.apache.pulsar.broker.systopic.SystemTopicClient; +import org.apache.pulsar.broker.transaction.buffer.AbortedTxnProcessor; +import org.apache.pulsar.broker.transaction.buffer.metadata.v2.TransactionBufferSnapshotIndex; +import org.apache.pulsar.broker.transaction.buffer.metadata.v2.TransactionBufferSnapshotIndexes; +import org.apache.pulsar.broker.transaction.buffer.metadata.v2.TransactionBufferSnapshotIndexesMetadata; +import org.apache.pulsar.broker.transaction.buffer.metadata.v2.TransactionBufferSnapshotSegment; +import org.apache.pulsar.broker.transaction.buffer.metadata.v2.TxnIDData; +import org.apache.pulsar.client.api.Message; +import org.apache.pulsar.client.api.Schema; +import org.apache.pulsar.client.api.transaction.TxnID; +import org.apache.pulsar.client.impl.MessageIdImpl; +import org.apache.pulsar.client.impl.PulsarClientImpl; +import org.apache.pulsar.common.naming.SystemTopicNames; +import org.apache.pulsar.common.naming.TopicDomain; +import org.apache.pulsar.common.naming.TopicName; +import org.apache.pulsar.common.protocol.Commands; +import org.apache.pulsar.common.util.FutureUtil; + +@Slf4j +public class SnapshotSegmentAbortedTxnProcessorImpl implements AbortedTxnProcessor { + + /** + * Stored the unsealed aborted transaction IDs Whose size is always less than the snapshotSegmentCapacity. + * It will be persistent as a snapshot segment when its size reach the configured capacity. + */ + private LinkedList<TxnID> unsealedTxnIds; + + /** + * The map is used to clear the aborted transaction IDs persistent in the expired ledger. + * <p> + * The key PositionImpl {@link PositionImpl} is the persistent position of + * the latest transaction of a segment. + * The value TxnID {@link TxnID} is the latest Transaction ID in a segment. + * </p> + * + * <p> + * If the position is expired, the processor can get the according latest + * transaction ID in this map. And then the processor can clear all the + * transaction IDs in the aborts {@link SnapshotSegmentAbortedTxnProcessorImpl#aborts} + * that lower than the transaction ID. + * And then the processor can delete the segments persistently according to + * the positions. + * </p> + */ + private final LinkedMap<PositionImpl, TxnID> segmentIndex = new LinkedMap<>(); + + /** + * This map is used to check whether a transaction is an aborted transaction. + * <p> + * The transaction IDs is appended in order, so the processor can delete expired + * transaction IDs according to the latest expired transaction IDs in segmentIndex + * {@link SnapshotSegmentAbortedTxnProcessorImpl#segmentIndex}. + * </p> + */ + private final LinkedMap<TxnID, TxnID> aborts = new LinkedMap<>(); Review Comment: There is no `LinkedSet` in the JAVA library. -- 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. 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