[Solved] This Kafka multi-datacenter replication code has a bug. What is it?def replicate_message(message, datacenters): for dc in datacenters: if dc == "primary": continue datacenters[dc].... | Kafka

Kafka - Multi-Datacenter and Replication

This Kafka multi-datacenter replication code has a bug. What is it?

def replicate_message(message, datacenters):
    for dc in datacenters:
        if dc == "primary":
            continue
        datacenters[dc].append(message)

clusters = {"primary": [], "backup": []}
replicate_message("hello", clusters)
print(clusters)

AIt causes an infinite loop

BIt tries to append to a string instead of a list

CIt modifies the dictionary keys instead of values

DIt skips replicating to the primary datacenter

Step-by-Step Solution

Solution:

Step 1: Review the replicate_message function logic
The function skips the datacenter named "primary" and only appends message to others.
Step 2: Understand the impact of skipping primary
Skipping primary means the original datacenter does not get the message, which is a bug for replication.
Final Answer:
It skips replicating to the primary datacenter -> Option D
Quick Check:
Skipping primary = Bug in replication [OK]

Quick Trick: Check which datacenters get the message appended [OK]

Common Mistakes:

Thinking it modifies keys instead of values
Assuming infinite loop due to for loop
Confusing list and string types

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This Kafka multi-datacenter replication code has a bug. What is it?

Step 1: Review the replicate_message function logic

Step 2: Understand the impact of skipping primary

Final Answer:

Quick Check:

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