During online resharding, which step protects correctness the most?

Problem Statement

Explanation

Dual write keeps both locations consistent during cutover. You can compare read results and switch the router after parity checks. Backfills handle historical data. Once confidence is high, stop writing to the old shard and decommission.

Code Solution

SolutionRead Only

router: write→old+new; read→old until parity flag flips

Practice Sets

This question appears in the following practice sets:

Database Sharding & Partitioning

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During online resharding, which step protects correctness the most?

Problem Statement

Explanation

Code Solution

Practice Sets

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More from System Design

Master Interviews Anywhere, Anytime

During online resharding, which step protects correctness the most?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which statement best describes the Single Responsibility Principle?

Open–Closed Principle encourages what practice when adding features?

High-Level Design (HLD) typically focuses on which artifacts?

Which UML diagram best captures interactions over time between components?

Which pairing describes a healthy design goal?

More from System Design

Master Interviews
Anywhere, Anytime