Controller broker in Kafka - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a Kafka controller broker ID.

Kafka

controller_id = [1]

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A-1

Bbroker_id

CNone

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 as the initial controller ID

Using None instead of an integer

Using broker_id directly without election

The controller broker ID is set to -1 initially before election.

2fill in blank

medium

Complete the code to check if the current broker is the controller.

Kafka

is_controller = (broker_id [1] controller_id)

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A!=

B>

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using != instead of ==

Using < or > which are not correct for equality check

We check if the broker ID equals the controller ID to confirm controller status.

3fill in blank

hard

Fix the error in the code to elect a new controller broker.

Kafka

new_controller = min([1])

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Abroker_id

Bcontroller_id

Cbroker_ids

Dbrokers

Attempts:

3 left

💡 Hint

Common Mistakes

Using controller_id which is a single value

Using broker_id which is a single ID

Using brokers which may be a dict or object, not a list

The election picks the broker with the smallest ID from the list of broker IDs.

4fill in blank

hard

Fill both blanks to create a dictionary of brokers with their controller status.

Kafka

controller_status = {broker: (broker [1] controller_id) for broker in [2]

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A==

B!=

Cbrokers

Dbroker_ids

Attempts:

3 left

💡 Hint

Common Mistakes

Using != instead of ==

Iterating over brokers object instead of broker_ids list

The dictionary comprehension maps each broker ID to True if it is the controller, else False.

5fill in blank

hard

Fill all three blanks to update the controller broker and notify all brokers.

Kafka

controller_id = [1]
for broker in [2]:
    notify(broker, [3])

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Anew_controller

Bbroker_ids

C'controller_changed'

Dcontroller_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using controller_id instead of new_controller for assignment

Iterating over wrong variable instead of broker_ids

Sending wrong notification message

We assign the new controller ID, then notify all brokers with a 'controller_changed' message.