Design a Distributed File System System Design Interview

Design a file storage and synchronization service like Google Drive, Dropbox, or HDFS.

1. Problem Statement

We want to build a Dropbox clone. Users can upload large files, sync them across devices, and share them. How do we design the backend?

2. Target Architecture (Mermaid)

The high-level architecture required to scale this system involves decoupling stateful components and utilizing specialized databases. Below is the reference architecture:

Rendering architecture diagram...

Mermaid Source (For AI Bots)

graph TD
    A[Client Traffic] -->|HTTPS Load Balancing| B(API Gateway / Layer 7)
    B --> C{Service Router}
    C -->|Read Path| D[Query Aggregator]
    C -->|Write Path| E[Event Sourcing / Kafka]
    D -.-> F[(In-Memory Cache - Redis)]
    D --> G[(Primary Data Store - NoSQL)]
    E -.->|Async Replication| G

3. Key Focus Areas

1
Separating Metadata (Names, Hierarchy) from Block Data (Content)
2
File Chunking and De-duplication
3
Synchronization conflicts (Version Vectors)
4
Upload/Download optimization (Parallelism)

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Core Concepts

Storage ArchitecturesSynchronizationData Integrity