Search Header Logo
Learning Akka (Video 16)

Learning Akka (Video 16)

Assessment

Interactive Video

Information Technology (IT), Architecture

University

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

This video tutorial delves into the workings of persistent actors, focusing on event persistence, failure handling, recovery mode, and snapshot implementation. It explains the persist and persistAsync methods, how to handle failures, and the recovery process. The video also covers how to take snapshots when the state is a multiple of five, ensuring data integrity and efficient state management. The tutorial concludes with a summary of the persistent actor's implementation and a preview of the next video, which will explore FSM style.

Read more

5 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main difference between 'persist' and 'persistAsync' methods in persistent actors?

'persist' allows new commands during event handling, 'persistAsync' does not.

'persistAsync' allows new commands during event handling, 'persist' does not.

Both methods allow new commands during event handling.

Neither method allows new commands during event handling.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens by default when a persist event fails in a persistent actor?

The actor ignores the error and stops.

The actor logs the error and stops.

The actor logs the error and continues running.

The actor retries the event persistence.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can you disable the recovery mode in a persistent actor?

By setting recovery mode to 'off' in the configuration.

By returning 'recovery.none' in the recovery method.

By not implementing a recovery method.

By using 'persistAsync' instead of 'persist'.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What message does a persistent actor receive if a snapshot is saved successfully?

SaveSnapshotFailure

SnapshotSaved

SaveSnapshotSuccess

SnapshotComplete

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When should a snapshot be taken according to the video?

When the state is a multiple of 3.

When the state is a multiple of 5.

When the actor starts.

When the state changes.

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Google

Continue with Google

Email

Continue with Email

Classlink

Continue with Classlink

Clever

Continue with Clever

or continue with

Microsoft

Microsoft

Apple

Apple

Others

Others

Already have an account?