Data replication strategies in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the primary replication type used for high availability.

HLD

ReplicationType = "[1]"  # Commonly used for synchronous data copying

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AAsynchronous

BEventual

CSynchronous

DSnapshot

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing asynchronous which delays data copying.

Synchronous replication ensures data is copied to replicas immediately, providing high availability.

2fill in blank

medium

Complete the code to select the replication strategy that allows replicas to lag behind the primary.

HLD

ReplicationStrategy = "[1]"  # Replicas update after some delay

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AAsynchronous

BQuorum-based

CSynchronous

DMulti-master

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing with synchronous replication which waits for confirmation.

Asynchronous replication allows replicas to lag, improving performance but risking stale reads.

3fill in blank

hard

Fix the error in the replication mode assignment to correctly represent multi-master replication.

HLD

replication_mode = "[1]"  # Allows multiple nodes to accept writes

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AMulti-master

BSingle-master

CPrimary-secondary

DRead-only

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing single-master which restricts writes to one node.

Multi-master replication allows multiple nodes to accept writes simultaneously, improving availability.

4fill in blank

hard

Fill both blanks to complete the code for a quorum-based replication read and write strategy.

HLD

write_quorum = "[1]"  # Minimum nodes to confirm write
read_quorum = "[2]"   # Minimum nodes to confirm read

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Amajority

Ball

Cone

Dnone

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'all' which is stricter and less available.

Quorum-based replication requires a majority of nodes to confirm reads and writes to ensure consistency.

5fill in blank

hard

Fill all three blanks to complete the code for a replication setup with primary, secondary, and failover nodes.

HLD

primary_node = "[1]"
secondary_node = "[2]"
failover_node = "[3]"

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Aaccepts writes

Breplicates data

Ctakes over if primary fails

Dmonitors health

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing failover with monitoring role.

The primary node accepts writes, the secondary replicates data, and the failover takes over if the primary fails.