westphal-jan commented on a change in pull request #15140: URL: https://github.com/apache/flink/pull/15140#discussion_r594346688
########## File path: flink-connectors/flink-connector-rabbitmq2/src/main/java/org/apache/flink/connector/rabbitmq2/source/reader/specialized/RabbitMQSourceReaderAtLeastOnce.java ########## @@ -0,0 +1,97 @@ +/* + * 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.connector.rabbitmq2.source.reader.specialized; + +import org.apache.flink.api.common.serialization.DeserializationSchema; +import org.apache.flink.api.connector.source.SourceReaderContext; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.connector.rabbitmq2.source.common.RabbitMQMessageWrapper; +import org.apache.flink.connector.rabbitmq2.source.reader.RabbitMQSourceReaderBase; +import org.apache.flink.connector.rabbitmq2.source.split.RabbitMQSourceSplit; + +import java.util.ArrayDeque; +import java.util.ArrayList; +import java.util.Deque; +import java.util.Iterator; +import java.util.List; + +/** + * The RabbitMQSourceReaderAtLeastOnce provides at-least-once guarantee. The deliveryTag from the + * received messages are used to acknowledge the messages once it is assured that they are safely + * consumed by the output. This means that the deliveryTags of the messages that were polled by the + * output are stored separately. Once a snapshot is executed the deliveryTags get associated with + * the checkpoint id. When the checkpoint is completed successfully, all messages from before are + * acknowledged. In the case of a failure of and a successful restart does rabbitmq resend the Review comment: Done. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
