Message retention and acknowledgment in GCP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the acknowledgment deadline for a Pub/Sub subscription.

GCP

subscription = pubsub_client.subscription('projects/my-project/subscriptions/my-subscription')
subscription.modify_ack_deadline(seconds=[1])

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

A10

B0

C60

D300

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the deadline to 0 causes immediate redelivery.

Using a very high value delays message redelivery unnecessarily.

The acknowledgment deadline is set in seconds. 60 seconds is a common default to allow enough time for message processing before redelivery.

2fill in blank

medium

Complete the code to acknowledge a received message in Pub/Sub.

GCP

def callback(message):
    print(f'Received message: {message.data}')
    message.[1]()

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

Areject

Back

Cdelete

Dcancel

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'reject' instead of 'ack' does not acknowledge the message.

Calling 'delete' is not a valid method on the message object.

Calling ack() on the message tells Pub/Sub that the message was processed successfully and should not be redelivered.

3fill in blank

hard

Fix the error in the code to extend the acknowledgment deadline for a message.

GCP

def callback(message):
    # Extend ack deadline by 30 seconds
    message.modify_ack_deadline(seconds=[1])
    message.ack()

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

A30

B300

C60

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 causes the message to be redelivered immediately.

Using too large a value may delay redelivery unnecessarily.

The modify_ack_deadline method extends the deadline by the given seconds. 30 seconds is a typical extension time.

4fill in blank

hard

Fill both blanks to create a subscription with a message retention duration and enable message ordering.

GCP

subscription = pubsub_client.create_subscription(
    name='projects/my-project/subscriptions/my-subscription',
    topic='projects/my-project/topics/my-topic',
    message_retention_duration=[1],
    enable_message_ordering=[2]
)

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

A'604800s'

B'3600s'

CTrue

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using integer instead of string for retention duration.

Setting enable_message_ordering to False disables ordering.

The message retention duration is set in seconds as a string with 's' suffix. '604800s' equals 7 days. Enabling message ordering requires setting enable_message_ordering to True.

5fill in blank

hard

Fill all three blanks to create a pull subscription with a custom acknowledgment deadline and enable exactly-once delivery.

GCP

subscription = pubsub_client.create_subscription(
    name='projects/my-project/subscriptions/my-subscription',
    topic='projects/my-project/topics/my-topic',
    ack_deadline_seconds=[1],
    enable_exactly_once_delivery=[2],
    retain_acked_messages=[3]
)

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

A20

BTrue

CFalse

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Setting ack_deadline_seconds too high or zero.

Disabling exactly-once delivery by setting it to False.

The acknowledgment deadline is set to 10 seconds. Exactly-once delivery and retaining acknowledged messages are enabled by setting their flags to True.