[Solved] Identify the bug in this Kafka event consumer code snippet for event sourcing:state = {} for event in events: if event["type"] == "create":... | Kafka

Kafka - Event-Driven Architecture

Identify the bug in this Kafka event consumer code snippet for event sourcing:

state = {}
for event in events:
    if event["type"] == "create":
        state[event["id"]] = event["value"]
    elif event["type"] == "update":
        if event["id"] in state:
            state[event["id"]] = event["value"]
    elif event["type"] == "delete":
        del state[event["id"]]

AMissing else clause for unknown event types

BUsing del without checking if id exists causes KeyError

CCreate should not overwrite existing id

DUpdate should create new id if not present

Step-by-Step Solution

Solution:

Step 1: Analyze delete operation
Using del without checking if the key exists can cause a KeyError if id is missing.
Step 2: Check other conditions
Update correctly checks if id exists before updating; create overwrites which is allowed; else clause is optional.
Final Answer:
Using del without checking if id exists causes KeyError -> Option B
Quick Check:
del without check = KeyError risk [OK]

Quick Trick: Always check key exists before deleting from dict [OK]

Common Mistakes:

Ignoring KeyError on delete
Thinking update must create new id
Believing create cannot overwrite

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More Kafka Quizzes

Identify the bug in this Kafka event consumer code snippet for event sourcing:

Step 1: Analyze delete operation

Step 2: Check other conditions

Final Answer:

Quick Check:

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