kafka TxnPartitionEntry 源码

  • 2022-10-20
  • 浏览 (559)

kafka TxnPartitionEntry 代码

文件路径:/clients/src/main/java/org/apache/kafka/clients/producer/internals/TxnPartitionEntry.java

/*
 * 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.kafka.clients.producer.internals;

import java.util.Comparator;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.function.Consumer;
import org.apache.kafka.common.requests.ProduceResponse;
import org.apache.kafka.common.utils.ProducerIdAndEpoch;

class TxnPartitionEntry {

    // The producer id/epoch being used for a given partition.
    ProducerIdAndEpoch producerIdAndEpoch;

    // The base sequence of the next batch bound for a given partition.
    int nextSequence;

    // The sequence number of the last record of the last ack'd batch from the given partition. When there are no
    // in flight requests for a partition, the lastAckedSequence(topicPartition) == nextSequence(topicPartition) - 1.
    int lastAckedSequence;

    // Keep track of the in flight batches bound for a partition, ordered by sequence. This helps us to ensure that
    // we continue to order batches by the sequence numbers even when the responses come back out of order during
    // leader failover. We add a batch to the queue when it is drained, and remove it when the batch completes
    // (either successfully or through a fatal failure).
    SortedSet<ProducerBatch> inflightBatchesBySequence;

    // We keep track of the last acknowledged offset on a per partition basis in order to disambiguate UnknownProducer
    // responses which are due to the retention period elapsing, and those which are due to actual lost data.
    long lastAckedOffset;

    // `inflightBatchesBySequence` should only have batches with the same producer id and producer
    // epoch, but there is an edge case where we may remove the wrong batch if the comparator
    // only takes `baseSequence` into account.
    // See https://github.com/apache/kafka/pull/12096#pullrequestreview-955554191 for details.
    private static final Comparator<ProducerBatch> PRODUCER_BATCH_COMPARATOR =
        Comparator.comparingLong(ProducerBatch::producerId)
            .thenComparingInt(ProducerBatch::producerEpoch)
            .thenComparingInt(ProducerBatch::baseSequence);

    TxnPartitionEntry() {
        this.producerIdAndEpoch = ProducerIdAndEpoch.NONE;
        this.nextSequence = 0;
        this.lastAckedSequence = TransactionManager.NO_LAST_ACKED_SEQUENCE_NUMBER;
        this.lastAckedOffset = ProduceResponse.INVALID_OFFSET;
        this.inflightBatchesBySequence = new TreeSet<>(PRODUCER_BATCH_COMPARATOR);
    }

    void resetSequenceNumbers(Consumer<ProducerBatch> resetSequence) {
        TreeSet<ProducerBatch> newInflights = new TreeSet<>(PRODUCER_BATCH_COMPARATOR);
        for (ProducerBatch inflightBatch : inflightBatchesBySequence) {
            resetSequence.accept(inflightBatch);
            newInflights.add(inflightBatch);
        }
        inflightBatchesBySequence = newInflights;
    }
}

相关信息

kafka 源码目录

相关文章

kafka BufferPool 源码

kafka BuiltInPartitioner 源码

kafka DefaultPartitioner 源码

kafka ErrorLoggingCallback 源码

kafka FutureRecordMetadata 源码

kafka IncompleteBatches 源码

kafka KafkaProducerMetrics 源码

kafka ProduceRequestResult 源码

kafka ProducerBatch 源码

kafka ProducerInterceptors 源码

0  赞