Media storage and CDN in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the primary storage type for media files.

HLD

media_storage = [1]

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

AObjectStorage

BMessageQueue

CInMemoryCache

DRelationalDatabase

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing relational databases which are not optimized for large binary files.

Using in-memory cache which is volatile and limited in size.

Object storage is ideal for storing large media files because it is scalable and optimized for unstructured data.

2fill in blank

medium

Complete the code to define the CDN component responsible for caching media content.

HLD

cdn_cache = [1]

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

AEdgeServer

BLoadBalancer

CDatabaseReplica

DMessageBroker

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing load balancers with caching servers.

Using database replicas which do not serve cached media content.

Edge servers in a CDN cache media content close to users to reduce latency and improve delivery speed.

3fill in blank

hard

Fix the error in the request flow to ensure media requests are routed to the nearest CDN node.

HLD

user_request -> [1] -> origin_server

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

ALoadBalancer

BMessageQueue

CEdgeServer

DDatabase

Attempts:

3 left

💡 Hint

Common Mistakes

Routing requests directly to the origin server causing higher latency.

Using load balancers which do not cache content.

Requests should first go to the nearest edge server (CDN node) to serve cached content before reaching the origin server.

4fill in blank

hard

Fill both blanks to complete the media upload flow with caching and storage.

HLD

upload_request -> [1] -> [2] -> confirmation

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

AOriginServer

BEdgeServer

CObjectStorage

DLoadBalancer

Attempts:

3 left

💡 Hint

Common Mistakes

Sending uploads directly to edge servers which are for caching, not storage.

Skipping load balancer causing uneven request distribution.

Uploads first go through a load balancer to distribute requests, then are stored in object storage for durability.

5fill in blank

hard

Fill all three blanks to define a dictionary mapping media types to their CDN cache policies.

HLD

cache_policies = {"image": [1], "video": [2], "audio": [3]

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

A"short_ttl"

B"long_ttl"

C"medium_ttl"

D"no_cache"

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning no_cache to all media types causing poor performance.

Using short TTL for videos leading to frequent cache misses.

Images often have medium TTL, videos have long TTL due to size and popularity, and audio has short TTL for freshness.