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Beginner Topic 17 of 51 Distributed Systems & Cloud

Replication Strategies

Leader-follower and multi-leader copying.

How it works

Replication keeps copies of data or services on multiple nodes to improve availability, durability and read performance. Single-leader replication sends writes to one primary that streams changes to followers, multi-leader allows writes in several places with conflict resolution and leaderless systems such as Dynamo-style stores write to several replicas and use quorums, with read repair and anti-entropy. Replication can be synchronous, waiting for acknowledgements, or asynchronous, trading durability for latency. State machine replication uses consensus to apply the same operations in the same order.

Where it is used

Databases, key-value stores, file systems, caches and configuration services replicate data. Cross-region replication supports disaster recovery and low-latency reads.

Common pitfall

Asynchronous replication lags, so followers can serve stale reads and recent writes may be lost on failover. Multi-leader and leaderless setups need conflict handling. Split brain occurs when two nodes both act as leader. Choose quorum sizes so that read and write sets overlap, monitor replication lag and test failover.

Where it fits in the course

Replication Strategies is topic 17 of 51 in Distributed Systems & Cloud, rated Beginner. It follows Fault Tolerance. The next topic is Consistency Models.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Distributed Systems & Cloud quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Replication Strategies?
Leader-follower and multi-leader copying. It belongs to Distributed Systems & Cloud and is a beginner-level topic.
Where do people use Replication Strategies?
Databases, key-value stores, file systems, caches and configuration services replicate data.
What is the most common mistake with Replication Strategies?
Asynchronous replication lags, so followers can serve stale reads and recent writes may be lost on failover.
What should I learn before this topic?
Start with Fault Tolerance, the topic just before it in Distributed Systems & Cloud.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Distributed Systems & Cloud quiz.
Is Replication Strategies hard to learn?
It is a Beginner topic, so it works as an entry point. If the terms are new, read the explanation twice and try the visualizer before the quiz.
How long does it take to learn Replication Strategies?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Replication Strategies?
Fault Tolerance, Consistency Models, Caching Layers are closely connected. The full list is in the related topics section of this page.
What should I study after Replication Strategies?
Continue with Consistency Models, the next topic in Distributed Systems & Cloud.

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