Getting Started with Replicated Berkeley DB Applications

Table of Contents

Preface

Conventions Used in this Book

For More Information

1. Introduction

Overview

Replication Environments

Replication Databases

Communications Layer

Selecting a Master

Replication Benefits

The Replication APIs

Replication Manager Overview

Replication Base API Overview

Holding Elections

Influencing Elections

Winning Elections

Switching Masters

Permanent Message Handling

When Not to Manage Permanent Messages

Managing Permanent Messages

Implementing Permanent Message Handling

2. Transactional Application

Application Overview

Program Listing

Function: main()

Function: create_env()

Function: env_init()

Function: doloop()

Function: print_stocks()

3. The DB Replication Manager

Starting and Stopping Replication

Managing Election Policies

Selecting the Number of Threads

Adding the Replication Manager to ex_rep_gsg_simple

Permanent Message Handling

Identifying Permanent Message Policies

Setting the Permanent Message Timeout

Adding a Permanent Message Policy to ex_rep_gsg_repmgr

Managing Election Times

Managing Election Timeouts

Managing Election Retry Times

Managing Connection Retries

Managing Heartbeats

4. Replica versus Master Processes

Determining State

Processing Loop

Example Processing Loop

Running It

5. Additional Features

Delayed Synchronization

Managing Blocking Operations

Stop Auto-Initialization

Client to Client Transfer

Identifying Peers

Bulk Transfers