.................................................................................. 32 11.2.3 Producer 配置 ............................................................................................ ............................................................................... 35 11.3.1 针对 Producer ............................................................................................... ................................... 40 项目开源主页：https://github.com/alibaba/RocketMQ IV 13 Producer 最佳实践 ..........................................................................................

.................. 4 第一章： producer .......................................................................................................................... 5 一：Producer 启动流程 ..................... ............................ 5 二：Producer 如何发送消息 ................................................................................................... 6 2.1 producer 发送普通消息 .......................... ............................................................. 43 6.4：Broker 与 client（comsumer ，producer）之间的心跳， ................................ 44 6.5：Broker 与 namesrv 之间的心跳 ........................

topic 的路 由信息。 本文来自『中间件兴趣圈』公众号，仅作技术交流，未授权任何商业行为。 11 > 1.1 RocketMQ 核心概念扫盲篇 3. Client 消息客户端，包括 Producer(消息发送者)和 Consumer(消费消费者)．客户端在同一 时间只会连接一台 nameserver，只有在连接出现异常时才会向尝试连接另外一台。客户 端每隔 30s 向 Nameserver 温馨提示：消息发送者在到默认路由信息时，其队列数量，会选择 DefaultMQProdu cer#defaultTopicQueueNums 与 Nameserver 返回的的队列数取最小值，DefaultMQ Producer#defaultTopicQueueNums 默认值为 4，故自动创建的主题，其队列数量默认 为 4。 Step3：发送消息 DefaultMQProducerImpl#sendKernelImpl InterruptedException { DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_ group_name"); producer.setNamesrvAddr("127.0.0.1:9876"); producer.start(); for (int i = 0; i < 9; i++)

5.2. Testing nodes 5.3. Node Components: listener, producer, handler, consume, and synchronizer 5.4. Synchronizers and sync policy 5.5. Producer, consumer, and handlers 5.6. Listeners 6. Clustered "manager" is a standard Cellar node, and the event producing is disable on all others nodes ( cluster:producer-stop on all "managed" nodes). Like this, only the "manager" will send event to the nodes (which for details. 5.2. Testing nodes You can ping a node to test it: 5.3. Node Components: listener, producer, handler, consume, and synchronizer A Cellar node is actually a set of components, each component

5.2. Testing nodes 5.3. Node Components: listener, producer, handler, consume, and synchronizer 5.4. Synchronizers and sync policy 5.5. Producer, consumer, and handlers 5.6. Listeners 6. Clustered "manager" is a standard Cellar node, and the event producing is disable on all others nodes ( cluster:producer-stop on all "managed" nodes). Like this, only the "manager" will send event to the nodes (which for details. 5.2. Testing nodes You can ping a node to test it: 5.3. Node Components: listener, producer, handler, consume, and synchronizer A Cellar node is actually a set of components, each component

failed) Streaming sources… 3 Producers and consumers • An event is typically generated by a producer (or publisher or sender) and processed by one or multiple consumers (or subscribers or recipients) userLoggedIn, userLoggedOut, userSentPayment 4 Connecting producers to consumers • Indirectly • Producer writes to a file or database • Consumer periodically polls and retrieves new data • polling overhead consumer • Event retrieval is not defined by content / structure but its order • FIFO, priority producer consumer queue 6 Message brokers Message broker: a system that connects event producers with

分布式事务 异步解耦 IoT/IIoT 决策分析 实时计算 概念模型 Broker A Producer A Topic A Broker B Topic B ConsumerGroupA ConsumerGroupB Consumer 1 Consumer 2 Producer B Consumer 1 Consumer 2 MessageQueue1 MessageQueue2 All Info In Memory except KV config info Netty RemotingServer topic register and heart beats Producer Consumer NRC BrokerAddrTlb send Msg topic route heatbeats MsgQueList callback/check NRC Apache RocketMQ 存储设计 存储⽂文件 - - - - - 1G - - - - - 6M - - - - - 400M 配置和状态相关 消息存储和检索相关 存储设计 producer message(topic, queueId, tags, keys, msgBody) commitlog 8 bytes | 4 bytes | 8 bytes commitLogOffset

generated by the producer # compression.type=none # The number of acknowledgments the producer requires the leader to have received before considering a request complete # - 0: the producer doesn't wait for for ack # - 1: the producer just waits for the leader # - all: the producer waits for leader and all followers (replica), most secure # acks=all # Setting a value greater than zero will cause the client The producer will attempt to batch records together into fewer requests whenever multiple records are being sent to the same partition # batch.size=16384 # The total bytes of memory the producer can use

generated by the producer # compression.type=none # The number of acknowledgments the producer requires the leader to have received before considering a request complete # - 0: the producer doesn't wait for for ack # - 1: the producer just waits for the leader Apache Karaf Decanter 2.x - Documentation - 28 # - all: the producer waits for leader and all followers (replica), most secure # acks=all # Setting The producer will attempt to batch records together into fewer requests whenever multiple records are being sent to the same partition # batch.size=16384 # The total bytes of memory the producer can use

(recovery) • Manual intervention (admin interaction) Producer and Consumer Pattern • Front end (UI) or registry generates replication jobs (producer) • Backend workers handle replication (consumer) • front end / registry Front End Registry Worker 1 Worker 2 Worker3 Producer Consumer Job queue Dispatcher Modified Producer and Consumer Pattern • Non blocking for producers • Dispatcher queues Workers added back to available worker queue after jobs are completed Front End Registry Worker Producer Consumer Job queue dispatch Available worker queue Goroutine as Lightweight Thread • Simple