Q7a: A publish and subscribe system exposes a common event bus where clients subscribe to receive notifications about events. The distributed system consists of publisher and subscriber nodes communicating using the shared bus. Describe challenges with this architecture for ensuring distribution transparency to users.

Note: The goal of distributed system:

1. Support sharing resources (accessibility)

2. Distribution transparency (types: access, location, relocation, migration, replication, concurrency, failure)

3. Openness (goals: avoiding vendor lock-in, interoperability, portability, extensibility)

4. Scalability (types: size, geographical, administrative)

Publish and Subscribe System Component Component Notification delivery Subscribej Event bus Publish Component Publish and Subscribe System Component Component Notification delivery Subscribej Event bus Publish Component