Apache Dubbo vs Apache Sling: What are the differences?

Developers describe Apache Dubbo as "A high performance Java RPC framework". It is a high-performance, light weight, java based RPC framework. Dubbo offers three key functionalities, which include interface based remote call, fault tolerance & load balancing, and automatic service registration & discovery. On the other hand, Apache Sling is detailed as "Innovative web framework that is intended to bring back the fun to web development". It is a framework for RESTful web-applications based on an extensible content tree. It maps HTTP request URLs to content resources based on the request's path, extension and selectors. Using convention over configuration, requests are processed by scripts and servlets, dynamically selected based on the current resource. This fosters meaningful URLs and resource driven request processing, while the modular nature of Sling allows for specialized server instances that include only what is needed.

Apache Dubbo can be classified as a tool in the "Remote Procedure Call (RPC)" category, while Apache Sling is grouped under "Frameworks (Full Stack)".

Some of the features offered by Apache Dubbo are:

• Transparent interface based RPC
• Intelligent load balancing
• Automatic service registration and discovery

On the other hand, Apache Sling provides the following key features:

• REST based web framework
• Content-driven, using a JCR content repository
• Powered by OSGi

Apache Dubbo is an open source tool with 31K GitHub stars and 20.3K GitHub forks. Here's a link to Apache Dubbo's open source repository on GitHub.