Q7b: A message queue is used to ensure delivery of published messages to clients who have subscribed to the queue. To implement the persistence layer, a MySQL database deployed on a server is used. Describe challenges with this architecture with respect to distributed system design goals.

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)