Retention policies (time-based, size-based) in Kafka - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a time-based retention policy of 7 days for a Kafka topic.

Kafka

retention.ms=[1]  # Set retention to 7 days in milliseconds

Drag options to blanks, or click blank then click option'

A259200000

B604800000

C86400000

D3600000

Attempts:

3 left

💡 Hint

Common Mistakes

Using seconds or minutes instead of milliseconds.

Confusing retention.ms with retention.bytes.

The retention.ms property is set in milliseconds. 7 days = 7 * 24 * 60 * 60 * 1000 = 604800000 ms.

2fill in blank

medium

Complete the code to set a size-based retention policy of 1 GB for a Kafka topic.

Kafka

retention.bytes=[1]  # Set retention size to 1 GB

Drag options to blanks, or click blank then click option'

A1024000000

B1048576

C1000000000

D1073741824

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1,000,000,000 bytes instead of 1,073,741,824 bytes.

Confusing retention.bytes with retention.ms.

1 GB in bytes is 1024 * 1024 * 1024 = 1073741824 bytes.

3fill in blank

hard

Fix the error in the retention policy configuration to correctly set retention to 3 days.

Kafka

retention.ms = [1]  # Intended 3 days retention

Drag options to blanks, or click blank then click option'

A86400000

B300000

C259200000

D3600000

Attempts:

3 left

💡 Hint

Common Mistakes

Using 300000 which is 5 minutes.

Using 86400000 which is 1 day.

3 days in milliseconds is 3 * 24 * 60 * 60 * 1000 = 259200000 ms.

4fill in blank

hard

Fill both blanks to create a retention policy that deletes messages older than 2 days or when the log size exceeds 500 MB.

Kafka

retention.ms = [1]
retention.bytes = [2]

Drag options to blanks, or click blank then click option'

A172800000

B524288000

C1048576000

D86400000

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up retention.ms and retention.bytes values.

Using 1 GB instead of 500 MB for retention.bytes.

2 days in milliseconds is 2 * 24 * 60 * 60 * 1000 = 172800000 ms.
500 MB in bytes is 500 * 1024 * 1024 = 524288000 bytes.

5fill in blank

hard

Fill all three blanks to configure a Kafka topic with a retention time of 12 hours, a retention size of 200 MB, and a cleanup policy of delete.

Kafka

retention.ms = [1]
retention.bytes = [2]
cleanup.policy = "[3]"

Drag options to blanks, or click blank then click option'

A43200000

B209715200

Cdelete

Dcompact

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'compact' instead of 'delete' for cleanup.policy.

Mixing up retention.ms and retention.bytes values.

12 hours in milliseconds is 12 * 60 * 60 * 1000 = 43200000 ms.
200 MB in bytes is 200 * 1024 * 1024 = 209715200 bytes.
The cleanup policy 'delete' means old messages are removed based on retention policies.