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DLedger 基于 raft 协议，故天然支持主从切换，即主节点(Leader)发生故障，会重新触发选主，在集群内再选举出新的主节点。RocketMQ 中主从同步，从节点不仅会从主节点同步数据，也会同步元数据，包含 topic 路由信息、消费进度、延迟队列处理队列、消费组订阅配置等信息。那主从切换...

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本文紧接着源码分析 RocketMQ DLedger(多副本) 之日志追加流程，继续 Leader 处理客户端 append 的请求流程中最至关重要的一环：日志复制。温馨提示：由于微信单篇文章的字数限制，RocketMQ DLedger 日志复制分为两篇文章介绍。DLedger 多副...

源码分析 RocketMQ DLedger(多副本) 之日志追加流程

上一篇我们详细分析了源码分析RocketMQ多副本之Leader选主，本文将详细分析日志复制的实现。有了前篇源码分析 RocketMQ DLedger 多副本存储实现，本文将直接从 Leader 处理客户端请求入口开始，其入口为：DLedgerServer 的 handleAppend 方法开始...

源码分析 RocketMQ DLedger 多副本存储实现

RocketMQ DLedger 的存储实现思路与 RocketMQ 的存储实现思路相似，本文就不再从源码角度详细剖析其实现，只是点出其实现关键点。我们不妨简单回顾一下 CommitLog 文件、ConsumeQueue 文件设计思想。其文件组成形式如下：正如上图所示，多个 commitlog 文件...

源码分析 RocketMQ DLedger 多副本即主从切换实现原理

DLedger 基于 raft 协议，故天然支持主从切换，即主节点(Leader)发生故障，会重新触发选主，在集群内再选举出新的主节点。 RocketMQ 中主从同步，从节点不仅会从主节点同步数据，也会同步元数据，包含 topic 路由信息、消费进度、延迟队列处理队列、消费组订阅配置等信息。那主从切...

源码分析 RocketMQ DLedger(多副本) 之日志复制(传播)

本文紧接着源码分析 RocketMQ DLedger(多副本) 之日志追加流程，继续 Leader 处理客户端 append 的请求流程中最至关重要的一环：日志复制。 DLedger 多副本的日志转发由 DLedgerEntryPusher 实现，接下来将对其进行详细介绍。温馨提示：由于本篇幅...

源码分析 RocketMQ DLedger 多副本存储实现

RocketMQ DLedger 的存储实现思路与 RocketMQ 的存储实现思路相似，本文就不再从源码角度详细剖析其实现，只是点出其实现关键点。我们不妨简单回顾一下 CommitLog 文件、ConsumeQueue 文件设计思想。其文件组成形式如下：正如上图所示，多个 commitlog 文...

源码分析 RocketMQ DLedger 多副本之 Leader 选主

本文将按照《RocketMQ 多副本前置篇：初探raft协议》的思路来学习RocketMQ选主逻辑。首先先回顾一下关于Leader的一些思考：节点状态需要引入3种节点状态：Follower(跟随者)、Candidate(候选者)，该状态下的节点会发起投票请求，Leader(主节点)。选举计时器F...

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