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How can you ensure message order is preserved when using Redis as a message broker in Flask?

hard📝 Application Q9 of 15
Flask - Background Tasks
How can you ensure message order is preserved when using Redis as a message broker in Flask?
AUse Redis Lists with LPUSH and RPOP or LPUSH and BRPOP
BUse Redis Sets to store messages
CUse Redis Hashes with incremental keys
DUse Redis Sorted Sets with random scores
Step-by-Step Solution
Solution:

  1. Step 1: Understand message order preservation

    Lists maintain order; LPUSH adds to left, RPOP or BRPOP removes from right, preserving FIFO order.

  2. Step 2: Check other options

    Sets are unordered, hashes are key-value stores without order, sorted sets require meaningful scores, random scores break order.

  3. Final Answer:

    Use Redis Lists with LPUSH and RPOP or LPUSH and BRPOP -> Option A

  4. Quick Check:

    Redis Lists preserve order with LPUSH + RPOP/BRPOP [OK]
Quick Trick: Lists keep order; sets and hashes do not [OK]
Common Mistakes:
MISTAKES
  • Using sets which are unordered
  • Assigning random scores in sorted sets
  • Trying to order hashes

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