Kalyani Bogala’s Post

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Junior GenAI Developer | Member of @Google Women Techmakers

Day 21 of my system design journey: Understanding Data Consistency and Consistency Levels Today, I explored the critical concept of data consistency in distributed systems. When data is spread across multiple nodes (often for better availability and fault tolerance), data consistency ensures that all nodes reflect the same view of the data. However, achieving this across a distributed architecture comes with challenges like network latency, node failures, and concurrent updates. Here are the key consistency models I learned about: 1. Strong Consistency: Every read operation reflects the most recent write, ensuring no stale data. Although it prioritizes data integrity, it can impact system performance and availability due to the need for synchronization across nodes. 2. Eventual Consistency: This model ensures that all replicas eventually converge to the same state, even if there's a delay. It’s often used in systems where high availability and partition tolerance are more important than immediate consistency, like in NoSQL databases. 3. Causal Consistency: Operations that are causally related are seen in the same order by all nodes. This model maintains a balance between strong consistency and the system’s scalability. 4. Read-Your-Writes Consistency: A client sees the effects of its own writes in subsequent read operations, providing an intuitive user experience. Data consistency is a fascinating topic because it’s all about trade-offs—between speed, availability, and accuracy. Different systems use different models based on their requirements for performance, availability, and fault tolerance. #SystemDesign #DistributedSystems #DataConsistency #LearningJourney

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