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Listening Quiz: Thảo luận về sự đánh đổi trong chiến lược cache cho dịch vụ tải cao – Advanced Level
Th1 8, 2025
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bởi
Anna Phạm
trong
Tiếng Anh dành cho Kỹ sư phần mềm (English for Software Engineer)
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1.
What are Michael and Sarah mainly discussing?
Methods for increasing website design speed
How to reduce employee training costs
Ways to improve a service’s caching strategy
Plans for launching a new product feature
Explanation:
The conversation is about improving caching for a high-traffic service and weighing trade-offs such as write-through vs. write-back, cache size, eviction policies, and consistency.
2.
According to Sarah, why is write-through cache considered safer?
It is easier to scale across servers
It avoids stale data but is slower for writes
It improves hit rate without adding complexity
It reduces memory usage significantly
Explanation:
Sarah says, ‘Write-through is safer but slower for writes,’ while Michael notes write-back risks stale data.
3.
What eviction policy does Sarah say works well for their access patterns?
Least frequently used
FIFO
Random replacement
LRU
Explanation:
Sarah directly states, ‘LRU works well for our access patterns.’
4.
What can be inferred about the service’s traffic and caching needs?
The service likely needs a simple cache with no consistency rules
The service probably does not use caching at all right now
The service only needs a larger cache and nothing else
The service likely handles enough traffic that cache design choices matter a lot
Explanation:
They mention a high-traffic service, high cache misses, possible bottlenecks, and the need to test approaches, which implies caching choices are important and nontrivial.
5.
What do Michael and Sarah decide to do next?
Increase the cache size without testing
Switch immediately to a write-back cache
Test both caching approaches before deciding
Remove distributed caching from the service
Explanation:
Sarah says, ‘Let’s test both approaches before deciding,’ which is their agreed next step.
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