amqp

How to send message to Azure event hub with amqp in python

由 拜拜、爱过 提交于 2020-01-03 05:53:26
问题 Anyone knows how to send a message to Azure event hub with amqp in python? I need to send the message with partition key(not the partition id). Thanks very much. 回答1: According to the section Use of partition keys of the offical document Partitioned queues and topics , as below, you can send a message with partition key via set the PartitionKey property of the message. PartitionKey : If a message has the BrokeredMessage.PartitionKey property but not the BrokeredMessage.SessionId property set,

How to listen to multiple queues with autowired Spring Boot?

由 别说谁变了你拦得住时间么 提交于 2020-01-02 04:30:48
问题 I'm new to Spring boot and I'm playing around with it. Currently I've build some apllications that I want to be able to communicate with each other through queues. I currently have a Listener object that can receive message from a particular queue. @Configuration public class Listener { final static String queueName = "myqueue"; @Bean SimpleMessageListenerContainer container(ConnectionFactory connectionFactory, MessageListenerAdapter listenerAdapter) { SimpleMessageListenerContainer container

Rabbitmq retrieve multiple messages using single synchronous call using .NET

由 你离开我真会死。 提交于 2020-01-02 03:58:04
问题 Is there a way to receive multiple message using a single synchronous call using .NET? I've seen question and I've found java class com.rabbitmq.client.QueueingConsumer, but I haven't found such client class in .NET namespaces (RabbitMQ.Client, RabbitMQ.Client.Events) 回答1: You can retrieve as many messages as you want using the BasicQoS.PrefetchCount : var model = _rabbitConnection.CreateModel(); // Configure the Quality of service for the model. Below is how what each setting means. //

RabbitMQ Topic exchanges: 1 Exchange vs Many Exchanges

由 强颜欢笑 提交于 2020-01-02 00:23:06
问题 I have a scenario where I have a series of processes I need to perform, each step is done and scaled in independent applications. I am using topic exchanges for all exchanges. Current topology is something like this: P -> X -> Q -> C/P -> X -> Q -> C We are "versioning" our queues to deal with probable requirements changes effecting message structure. Bindings might look something like this: step1.exchange bound to step1.v1.queue with binding key step1.v1 step1.exchange bound to step1.v2

What are some queuing mechanisms for implementing round-robin queues?

由 ↘锁芯ラ 提交于 2020-01-01 04:30:13
问题 I have multiple task producers that add work to a queue. I also have multiple consumers that feed off that queue. Since these queues are FIFO, they are dequeued in the same order they were added. In my scenario, tasks are added to the queue from HTTP requests. Each task is associated with an account and there is no rate-limiting. Therefore it is possible to have tasks from one account flood the message queue. In order to solve this, I've been looking for a queue implementation which allows me

In a FIFO Qeueing system, what's the best way the to implement priority messaging

由 那年仲夏 提交于 2019-12-30 02:15:48
问题 For message-oriented middleware that does not consistently support priority messages (such as AMQP) what is the best way to implement priority consumption when queues have only FIFO semantics? The general use case would be a system in which consumers receive messages of a higher priority before messages of a lower priority when a large backlog of messages exists in Queue(s). 回答1: Given only FIFO support for a given single queue, you will of course have to introduce either multiple queues, an

RabbitMQ用户指南（RabbitMQ-C）

由 依然范特西╮ 提交于 2019-12-29 17:32:19
RabbitMQ-C客户端使用说明 rabbitmq-c是一个用于C语言的，与AMQP server进行交互的client库，AMQP协议为版本0-9-1。rabbitmq-c与server进行交互前需要首先进行login操作，在操作后，可以根据AMQP协议规范，执行一系列操作。 这里，根据项目需求，只进行部分接口说明，文后附demo的github地址。 接口描述： amqp_connection_state_t amqp_new_connection(void); 接口说明：声明一个新的amqp connection int amqp_open_socket(char const *hostname, int portnumber); 接口说明：获取socket. 参数说明：hostname RabbitMQ server所在主机 portnumber RabbitMQ server监听端口 void amqp_set_sockfd(amqp_connection_state_t state,int sockfd); 接口说明：将amqp connection和sockfd进行绑定 amqp_rpc_reply_t amqp_login(amqp_connection_state_t state, char const *vhost,int channel_max,int

Consuming not acknowledge messages from RabbitMq

由 感情迁移 提交于 2019-12-29 04:02:53
问题 I have create a simple publisher and a consumer which subscribes on the queue using basic.consume . My consumer acknowledges the messages when the job runs without an exception. Whenever I run into an exception I don´t ack the message and return early. Only the acknowledged messages disappear from the queue, so that´s working correctly. Now I want the consumer to pick up the failed messages again, but the only way to reconsume those messages is by restarting the consumer. How do I need to

Kafka集群搭建

由 眉间皱痕 提交于 2019-12-26 23:10:11
Kafka初识 Kafka使用背景 在我们大量使用分布式数据库、分布式计算集群的时候，是否会遇到这样的一些问题： 我们想分析下用户行为（pageviews），以便我们设计出更好的广告位 我想对用户的搜索关键词进行统计，分析出当前的流行趋势 有些数据，存储数据库浪费，直接存储硬盘效率又低 这些场景都有一个共同点： 数据是由上游模块产生，上游模块，使用上游模块的数据计算、统计、分析，这个时候就可以使用消息系统，尤其是分布式消息系统！ Kafka的定义 What is Kafka：它是一个分布式消息系统，由linkedin使用scala编写，用作LinkedIn的活动流（Activity Stream）和运营数据处理管道（Pipeline）的基础。具有高水平扩展和高吞吐量。 Kafka和其他主流分布式消息系统的对比 定义解释： Java 和 scala都是运行在JVM上的语言。 erlang和最近比较火的和go语言一样是从代码级别就支持高并发的一种语言，所以RabbitMQ天生就有很高的并发性能，但是 有RabbitMQ严格按照AMQP进行实现，受到了很多限制。kafka的设计目标是高吞吐量，所以kafka自己设计了一套高性能但是不通用的协议，他也是仿照AMQP（ Advanced Message Queuing Protocol 高级消息队列协议）设计的。 事物的概念：在数据库中

RabbitMQ入门

由 拥有回忆 提交于 2019-12-26 17:10:27
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 本章主要介绍RabbitMQ 的基本概念 rabbitMQ整体上是一个生产者与消费者模型，主要负责接收、存储和转发消息。 Producer: 生产者，就是投递消息的一方。 消息一般可以包含2个部分：消息体和标签(Label)。消息体也可以称为 payload，在实际应用中，消息体一般是一个带有业务逻辑结构的数据，比如一个JSON字符串。 标签用来表述这条消息，比如一个交换器的名称和一个路由键。生产者把消息交由 RabbitMQ，RabbitMQ 之后会根据标签把消息发送给感兴趣的消费者(Consumer) Consumer: 消费者，就是接收消息的一方。 消费者连接到 RabbitMQ 服务器，并订阅到队列上。当消费者消费一条消息时，只是消费消息的消息体(payload)。在消息路由的过程中，消息的标签会丢弃，存入到队列中的消息只有消息体，消费者也只会消费到消息体，也就不知道消息的生产者是谁，当然消费者也不需要知道。 Broker: 消息中间件的服务节点。 对于 RabbitMQ 来说，一个 RabbitMQ Broker 可以简单地看作一个 RabbitMQ 服务节点，或者 RabbitMQ 服务实例。大多数情况下也可以将一个 RabbitMQ Broker 看作一台服务器。 生产者将消息存入
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