Why messaging requires real-time architecture in HLD - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the key feature of real-time messaging.

HLD

Real-time messaging systems must deliver messages with [1] latency to ensure timely communication.

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

Avariable

Bno

Clow

Dhigh

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'high' latency which causes delays.

Real-time messaging requires low latency to deliver messages quickly and keep conversations smooth.

2fill in blank

medium

Complete the code to specify the architecture component that supports real-time messaging.

HLD

A common architecture component for real-time messaging is the [1], which manages message delivery instantly.

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

Aload balancer

Bdatabase

Cfile server

Dmessage broker

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'database' which stores data but doesn't handle instant delivery.

The message broker handles real-time message routing and delivery efficiently.

3fill in blank

hard

Fix the error in the statement about real-time messaging guarantees.

HLD

Real-time messaging systems guarantee [1] message delivery without any loss.

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

Abest-effort

Beventual

Cguaranteed

Ddelayed

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'guaranteed' which is not always possible in real-time messaging.

Real-time messaging often uses best-effort delivery, meaning messages are sent quickly but some loss can occur.

4fill in blank

hard

Fill both blanks to complete the real-time messaging system design snippet.

HLD

Clients connect to the [1] to send messages, which are then pushed to subscribers using [2] protocols.

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

Amessage broker

BHTTP

CWebSocket

Ddatabase

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'HTTP' which is request-response, not real-time push.

Clients use a message broker to send messages, and WebSocket protocols enable real-time push to subscribers.

5fill in blank

hard

Fill all three blanks to complete the real-time messaging architecture code snippet.

HLD

To scale real-time messaging, use [1] to distribute load, [2] for message persistence, and [3] to notify clients instantly.

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

Aload balancers

Bmessage queues

Cpush notifications

Dcaches

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'caches' which are fast but not reliable for persistence.

Load balancers distribute client connections, message queues persist messages reliably, and push notifications alert clients instantly.