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Arpit Bhayani Blogs
001 Ai Topological Sort

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TLDR: Replication Strategies - Synchronous, Asynchronous, and Semi-Synchronous

Date: 2021-08-10 Source: https://arpitbhayani.me/blogs/replication-strategies

Overview

Explore synchronous, asynchronous, and semi-synchronous data replication strategies in distributed systems. Understand their trade-offs and implications. In a distributed system, when replication is set up between data nodes, there are typically three replication strategies - Synchronous, Asynchronous, and Semi-synchronous.

Key Points

  • prepare for disaster recovery, or
  • improve performance by leveraging parallel reads across replicated data, or
  • keep the data geographically close to the user, e.g., CDN
  • Synchronous Replication: In Synchronous Replication, once the Master node updates its own copy of the data, it initiates the write operation on its replicas.
  • Asynchronous Replication: In Asynchronous Replication, once the Master node updates its own copy of the data, it immediately completes the operation by responding to the Client.
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  • Semi-synchronous Replication: In Semi-synchronous Replication, which sits right between the Synchronous and Asynchronous Replication strategies, once the Master node updates its own copy of the data, it synchronously replicates the data to a subset of Replicas and asynchronously to others. !semi-synchronous replication The Semi-synchronous Replication thus addresses the durability of data, in case of Master crash, at the cost of degrading the Client’s throughput by a marginal factor.

    • Takeaway

    In Semi-synchronous Replication, which sits right between the Synchronous and Asynchronous Replication strategies, once the Master node updates its own copy of the data, it synchronously replicates the data to a subset of Replicas and asynchronously to others. !semi-synchronous replication The Semi-synchronous Replication thus addresses the durability of data, in case of Master crash, at the cost of degrading the Client’s throughput by a marginal factor.