Microservices - Migration from Monolith
A developer tries to horizontally decompose a user table by user ID but notices some queries fail due to missing data. What is the likely cause?
A developer tries to horizontally decompose a user table by user ID but notices some queries fail due to missing data. What is the likely cause?
medium📝 Analysis Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand horizontal decomposition by user ID
Data is split by user ID across shards.Step 2: Analyze query failure cause
Queries needing data from multiple shards may fail if not designed to aggregate results.Final Answer:
Data needed by queries is spread across multiple shards causing incomplete results -> Option BQuick Check:
Horizontal split -> queries need cross-shard aggregation [OK]
Quick Trick: Cross-shard queries need aggregation to avoid missing data [OK]
Common Mistakes:
- Confusing vertical and horizontal decomposition
- Blaming schema normalization
- Assuming user ID uniqueness solves query issues
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