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This.mqclient Factory.checkclient InBroker

As seen in: cnblogs.com, CSDN
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RocketMq消费原理及源码解析 - 牛肉干的技术笔记 - 博客园

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By This.defaultmq PushConsumer.getConsumer Group, This.defaultmq PushConsumer.getMessage Model, This.mqclient Factory.checkclient InBroker, this.mQClient Factory.rebalanceImmediately
| cnblogs.com
先简单说下常见的rocketMq的部署方式，上图中broker为真正计算和存储消息的地方，而nameServer负责维护broker地 图中右侧consume message部分即是本文重点描述的部分，主要分为ConsumerGroup和Consumer，consumerGroup可以参考https://rocketmq.apache.org/docs/domainModel/07consumergroup/。简单的说，Consumer即是一个运行的应用，ComsumerGroup即为多个运行的应用组，而其中一个Consumer是如何启动并接受消息进行消费的呢？ 以常见的java应用搭配spring为例，通常来说是在应用启动并实例化rocketmq sdk的相关类之后，调用相关类的初始化方法，获取nameServer地址和broker地址，启动netty客户端，并通过netty客户端向broker拉取消息，然后提交到消息消费服务中进行批量消费。 引言 https://rocketmq.apache.org/docs/quickStart/01quickstart...
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[RocketMQ] Consumer消费者启动主要流程源码 (六)

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By RPCHook rpcHook, This.defaultmq PushConsumer.getConsumer Group, This.defaultmq PushConsumer.getMessage Model, This.mqclient Factory.checkclient InBroker
| CSDN
checkConfig方法检查消费者的配置信息: 如果consumerGroup为空, 或者长度大于255个字符, 或者包含非法字符, 或者消费者组名为默认组名DEFAULT_CONSUMER, 或者messageModel为空, 或者consumeFromWhere为空, 或者consumeTimestamp为空, 或者allocateMessageQueueStrategy为空, 满足以上任意条件都校验不通过抛出异常。 调用copySubscription方法, 拷贝订阅关系, 然后为集群消费模式的消费者配置重试主题用于实现消费重试。 调用getOrCreateMQClientInstance方法, 根据clientId获取或者创建CreateMQClientInstance实例, 并赋给mQClientFactory变量。 设置负载均衡服务rebalanceImpl的相关属性。 创建消息拉取核心对象PullAPIWrapper, 封装了消息拉取以及结果解析逻辑的api。 根据消息模式设置不同的OffsetStore,...
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