Software Design

Chunked Multipart File Upload Flow

UML Sequence Diagrams · made in Skemio

Sequence diagram of Client, Storage API, and Storage Engine performing multipart initiation, chunk uploads, and final assembly.
Sequence diagram of Client, Storage API, and Storage Engine performing multipart initiation, chunk uploads, and final assembly.
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What it shows

  • Client splits big files into independent chunks of 5MB to 20MB locally
  • Chunks upload concurrently with independent retries upon network failures
  • Storage engine validates part ETags and executes fast server-side assembly

The takeaway

Multipart uploads turn fragile monolithic data transfers into fault-tolerant, parallelized operations.

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