[Solved] Consider this migration plan code snippet:services = ['auth', 'payment', 'order'] migrated = [] for s in services: migrate_service(s) migrated.append(s) if not test_service(s):... | Microservices

Microservices - Migration from Monolith

Consider this migration plan code snippet:

services = ['auth', 'payment', 'order']
migrated = []
for s in services:
    migrate_service(s)
    migrated.append(s)
    if not test_service(s):
        rollback_service(s)
        break
print(migrated)

What will be the output if test_service('payment') returns False?

A['auth', 'payment']

B['auth', 'payment', 'order']

C[]

D['auth']

Step-by-Step Solution

Solution:

Step 1: Trace migration and testing
'auth' migrates, appends to migrated, tests OK. 'payment' migrates and appends to migrated.
Step 2: Rollback and break loop
On test failure for 'payment', rollback happens but 'payment' was already appended, then loop breaks.
Final Answer:
['auth', 'payment'] -> Option A
Quick Check:
Appends before test, so includes failed service [OK]

Quick Trick: Stop migration on test failure, rollback last service [OK]

Common Mistakes:

Thinking failed service is not added to migrated list
Ignoring append before test
Continuing migration after failure

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More Microservices Quizzes

Consider this migration plan code snippet:

Step 1: Trace migration and testing

Step 2: Rollback and break loop

Final Answer:

Quick Check:

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