Microservices - Migration from Monolith
Given a microservice that stores user data split by country using horizontal decomposition, what happens if a user moves to a new country?
Given a microservice that stores user data split by country using horizontal decomposition, what happens if a user moves to a new country?
medium📝 Analysis Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand horizontal decomposition by country
Data is split by country, so each shard holds users from one country.Step 2: Consider user moving countries
User data must move to the shard for the new country to maintain consistency.Final Answer:
User data must be migrated from one database shard to another -> Option DQuick Check:
Moving user = migrate shard data [OK]
Quick Trick: User moves country -> migrate data shard [OK]
Common Mistakes:
- Assuming data stays in old shard
- Thinking data duplicates permanently
- Believing deletion and recreation is automatic
Master "Migration from Monolith" in Microservices
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