[Solved] Given this simplified Kafka setup code snippet, what happens if datacenter1 goes down?clusters = {"datacenter1": ["broker1", "broker2"], "datacenter2":... | Kafka

Kafka - Multi-Datacenter and Replication

Given this simplified Kafka setup code snippet, what happens if datacenter1 goes down?

clusters = {"datacenter1": ["broker1", "broker2"], "datacenter2": ["broker3", "broker4"]}
replication_factor = 2

# Messages are replicated across datacenters
messages = ["msg1", "msg2"]

# Simulate datacenter1 goes down
del clusters["datacenter1"]

# Consumer reads from datacenter2 if datacenter1 fails
consumer_datacenter = "datacenter2" if "datacenter1" not in clusters else "datacenter1"
print(f"Consumer reads from {consumer_datacenter}")

AConsumer reads from datacenter2

BConsumer reads from datacenter1

CConsumer reads from both datacenters simultaneously

DConsumer fails to read any data

Step-by-Step Solution

Solution:

Step 1: Understand the condition for consumer_datacenter
The code sets consumer_datacenter to datacenter2 if datacenter1 is missing from clusters.
Step 2: Analyze what happens if datacenter1 goes down
If datacenter1 is removed or down, it won't be in clusters, so consumer_datacenter becomes datacenter2.
Final Answer:
Consumer reads from datacenter2 -> Option A
Quick Check:
Failover to datacenter2 = Consumer reads datacenter2 [OK]

Quick Trick: Check condition for datacenter presence in clusters [OK]

Common Mistakes:

Assuming consumer always reads datacenter1
Thinking consumer reads both datacenters at once
Ignoring the if condition logic

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Given this simplified Kafka setup code snippet, what happens if datacenter1 goes down?

Step 1: Understand the condition for consumer_datacenter

Step 2: Analyze what happens if datacenter1 goes down

Final Answer:

Quick Check:

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