Overview

Tusflow implements advanced chunk management to handle large file uploads efficiently and reliably, leveraging edge computing capabilities and dynamic optimization.

Key Components

Features

Intelligent Chunk Sizing

• Considers network speed, file size, and edge worker memory limits
• Dynamically adjusts between 5MB and 50MB
• Ensures optimal upload performance and resource utilization

Parallel Upload Management

• Concurrent chunk uploads (up to 10 simultaneous uploads)
• Adaptive batch sizing based on network conditions
• Progress tracking per chunk with rate-limited updates

Error Handling and Recovery

• Automatic retries with exponential backoff
• Partial upload recovery
• Circuit breaker implementation for failure management

Performance Optimization

• Exponential moving average for network speed calculation
• Memory-aware chunk processing
• Efficient use of edge worker resources

How It Works

1. File Analysis

   • Analyze file size and type
   • Calculate initial network speed

2. Chunk Creation

   • Determine optimal chunk size using calculateOptimalChunkSize function
   • Consider edge worker memory constraints and network conditions

3. Parallel Processing

   • Upload chunks in parallel using adaptive batch sizes
   • Dynamically adjust concurrency based on network speed

4. Progress Tracking

   • Update upload progress with rate limiting
   • Store metadata in Upstash Redis for resumability

5. Completion and Verification

   • Verify all parts are uploaded correctly
   • Complete multipart upload on S3

Best Practices

1. Optimal Chunk Size Selection

   • Let Tusflow handle dynamic sizing
   • Monitor and adjust CHUNK_SIZE configuration if needed

2. Parallel Upload Configuration

   • Start with default MAX_CONCURRENT and BATCH_SIZE values
   • Adjust based on your specific use case and performance requirements

3. Error Handling

   • Implement client-side retry logic
   • Utilize Tusflow's built-in circuit breaker for failure management

4. Resource Management

   • Monitor edge worker memory usage
   • Implement proper cleanup for incomplete uploads

Code Examples

function calculateOptimalChunkSize(totalSize: number, networkSpeed: number): number {
  const { MIN, MAX } = UPLOAD_CONFIG.CHUNK_SIZE;
  const memoryBasedMax = Math.floor(WORKER_CONSTRAINTS.CHUNK_MEMORY_LIMIT / WORKER_CONSTRAINTS.NETWORK_OVERHEAD);
  const optimalSize = Math.min(networkSpeed * 2, MAX, memoryBasedMax);
  const minRequiredSize = Math.ceil(totalSize / UPLOAD_CONFIG.UPLOAD.MAX_PARTS);
  return Math.max(Math.min(optimalSize, MAX), MIN, minRequiredSize);
}

By leveraging intelligent chunk management, parallel processing, and adaptive optimization, Tusflow provides a powerful and flexible upload solution that can handle large files, network fluctuations, and high concurrency with ease.