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13.0 Zookeeper Leader Election Principles

Category Zookeeper Tutorial

Zookeeper's leader election has two phases: one is leader election during server startup, and the other is leader election during runtime when the leader server crashes. Before analyzing the election principles, let's introduce a few important parameters.

Election States:

1. Leader Election During Server Startup

Each node starts in the LOOKING state, and then begins the main election process. Here, we take a cluster composed of three machines as an example. When the first server, server1, starts, it cannot conduct leader election. When the second server, server2, starts, the two machines can communicate with each other and enter the leader election process.

2. Leader Election During Runtime

When the leader server in the cluster crashes or becomes unavailable, the entire cluster cannot provide external services and enters a new round of leader election.

-1.0 Zookeeper Tutorial

-2.0 Zookeeper Installation and Configuration

-3.0 Zookeeper Linux Server Cluster Setup Steps

-4.0 Zookeeper Java Client Setup

-5.0 ZooKeeper Data Model znode Structure Detailed

-6.0 Zookeeper Session Basic Principles

-7.0 Zookeeper Basic Client Commands Usage

-8.0 Zookeeper Four-Letter Commands

-9.0 Zookeeper Node Features

-10.0 Zookeeper Access Control ACL

-11.0 Zookeeper Watcher Event Mechanism Analysis

-12.0 Zookeeper Data Synchronization Process

-14.0 Zookeeper Distributed Lock Implementation Principles

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