PostgreSQL Logical Replication Load-Balancing Example

[clauspruefer]

Pull Request

Description

Add an example which demonstrates a) load balancing and b) write balancing. The example is using multiple docker container and a simple ESB driven orchestrator to setup a PostgreSQL multi-master logical replication environment.

Type of Change

• Example

[Copilot]

Pull request overview

This PR adds a comprehensive example demonstrating PostgreSQL logical replication with load-balancing capabilities using Docker containers and a microservice-based ESB (Enterprise Service Bus) orchestrator.

Changes:

• Adds Docker-based multi-master logical replication setup with configurable network topology
• Implements JSON-RPC server infrastructure for managing database nodes
• Provides orchestration scripts for automated container deployment and configuration

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 19 comments.

Show a summary per file

File	Description
example/01-logical-replication/sysconfig.json	System configuration defining network topology, roles, and scaling parameters
example/01-logical-replication/svc_call_metadata.py	Service call metadata definitions for network topology updates and database initialization
example/01-logical-replication/orchestrator.py	Main orchestration script that creates Docker containers and initializes the database cluster
example/01-logical-replication/run-container.sh	Shell script for launching individual database node containers
example/01-logical-replication/docker-network.sh	Script to create Docker network with custom subnet configuration
example/01-logical-replication/docker-build.sh	Script to build the database node Docker image
example/01-logical-replication/docker-daemon/daemon.json	Docker daemon configuration disabling iptables
example/01-logical-replication/db-node.dockerfile	Dockerfile defining the PostgreSQL database node with JSON-RPC server
example/01-logical-replication/db-node-rpc/start-server.sh	Script to start the JSON-RPC server in containers
example/01-logical-replication/db-node-rpc/service_properties.py	Service property definitions for ESB validation
example/01-logical-replication/db-node-rpc/service_implementation.py	ESB service handler implementations for database and network operations
example/01-logical-replication/db-node-rpc/json-rpc-server.py	JSON-RPC server implementation for handling remote procedure calls
example/01-logical-replication/db-node-rpc/esbconfig.py	ESB configuration for importing service classes
example/01-logical-replication/db-node-rpc/class_reference.py	Class hierarchy definitions for service routing
example/01-logical-replication/db-node-rpc/class_mapping.py	Mapping definitions between service names and implementation classes