DTGOV is starting to migrate some of its applications and services to a public cloud. Many of the technical staff have had no experience in the Cloud and are concerned about this process. You have recommended to DTGOV management that they should consider the use of microservices as part of their application architecture. DTGOV now want you to redesign one of their monolithic applications as a microservice application
DTGOV has an old and monolithic travel and accommodation booking application. This is used by a large number of DTGOV customers to book both travel and accommodation for business trips. The application has a number of modules as shown in Figure 1, below. Some of these modules may not need any development work done on them for long periods of time as their functions and outputs are relatively stable. Other modules though can be modified quite frequently as changes occur in the Industry. Other modules experience great peaks in workload which often slows services to DTGOV customers.
Figure 1: DTGOV travel and accommodation application architecture
1. You are to assess each of the modules shown in Figure 1 above, and determine:
a. Which modules are likely to be relatively stable, a together with the reasons for this categorisation,
b. Which modules are likely to require frequent modification, together with the reasons for this categorisation,
c. Which modules are likely to experience workload peaks, together with the reasons for this categorisation.
2. DTGOV wants to transition to a microservice approach with the Travel Booking application. But they want to move in a phased approach so that they can handle the workload peaks first.
a. Which modules should be refactored first?
b. Discuss how a move to a microservice approach for these modules would resolve issues around workload peaks?
3. Discuss how a move to a microservice approach will improve DTGOV’s ability to maintain high availability for this application.
4. Draw a diagram that shows the architecture of the Travel Booking application after the transition to a microservice approach.