GCP - Cloud Firestore and Bigtable
A Bigtable schema uses row keys as
timestamp#userID. Users report slow writes during peak times. What is the likely cause?A Bigtable schema uses row keys as timestamp#userID. Users report slow writes during peak times. What is the likely cause?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze row key pattern
Row keys start with timestamp, which increases sequentially.Step 2: Identify hotspotting effect
Sequential keys cause writes to focus on one tablet, causing slow writes.Final Answer:
Hotspotting due to sequential timestamps causing write concentration -> Option AQuick Check:
Sequential keys cause hotspots = B [OK]
Quick Trick: Avoid timestamp prefix to prevent write hotspots [OK]
Common Mistakes:
- Blaming column families for write slowness
- Thinking short keys cause slow writes
- Assuming compression affects write speed
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