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DefaultMQPushConsumerImpl拉取消息首先，DefaultMQPushConsumerImpl 是一个实现了 RocketMQ 的消费者客户端接口的类。该类的主要作用是从 RocketMQ 的 Broker 获取消息并进行消费。主要可以通过pullMessage方法进行获取对...

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什么是事务消息事务消息（Transactional Message）是指应用本地事务和发送消息操作可以被定义到全局事务中，要么同时成功，要么同时失败。RocketMQ的事务消息提供类似 X/Open XA 的分布事务功能，通过事务消息能达到分布式事务的最终一致。事务消息所对应的场景在一些对数据...

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精华推荐 | 【深入浅出RocketMQ原理及实战】「性能原理挖掘系列」透彻剖析贯穿RocketMQ的事务性消息的底层原理并在分析其实际开发场景

什么是事务消息事务消息（Transactional Message）是指应用本地事务和发送消息操作可以被定义到全局事务中，要么同时成功，要么同时失败。RocketMQ的事务消息提供类似 X/Open XA 的分布事务功能，通过事务消息能达到分布式事务的最终一致。事务消息所对应的场景在一些对数据一致性...

精华推荐 | 【深入浅出RocketMQ原理及实战】「性能原理挖掘系列」透彻剖析贯穿RocketMQ的系统服务底层原理以及高性能存储设计挖掘深入

设计背景消息中间件的本身定义来考虑，应该尽量减少对于外部第三方中间件的依赖。一般来说依赖的外部系统越多，也会使得本身的设计越复杂，采用文件系统作为消息存储的方式。RocketMQ存储机制消息中间件的存储一般都是利用磁盘，一般是使用机械硬盘，但机械硬盘的速度比访问内存慢了n个数量级，一款优秀的消息中间...

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前提背景使用RocketMQ进行发消息时，一般我们是必须要指定topic，此外topic必须要提前建立，但是topic的创建（自动或者手动方式）的设置有一个开关autoCreateTopicEnable，此部分主要会在broker节点的配置文件的时候进行设置，运行环境中会使用默认设置autoCrea...

精华推荐 | 【深入浅出RocketMQ原理及实战】「底层原理挖掘系列」透彻剖析贯穿RocketMQ的存储系统的实现原理和持久化机制

RocketMQ的发展历史RocketMQ是一个统一消息引擎、轻量级数据处理平台。RocketMQ是一款阿里巴巴开源的消息中间件。 2016 年 11 月 28 日，阿里巴巴向广西党性培训 Apache 软件基金会捐赠RocketMQ，成为 Apache 孵化项目。 2017 年 9 月 25 日...

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