Summary of Changes

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This pull request enhances the robustness of file downloads by introducing an automatic retry mechanism. This change aims to improve the reliability of resource acquisition, particularly in environments prone to intermittent network problems, and is expected to reduce CI failure rates. The retry behavior can be customized by setting specific environment variables.

Highlights

• Download Retries: Implemented a retry mechanism for file downloads to handle transient network issues and server errors.
• Configurable Parameters: The maximum number of retries and the base wait time between attempts are now configurable via environment variables (COLMAP_DOWNLOAD_MAX_RETRIES and COLMAP_DOWNLOAD_BASE_WAIT_SECONDS).
• Improved Error Handling: Refined error handling to differentiate between retryable HTTP errors (e.g., 5xx server errors) and non-retryable errors (e.g., 4xx client errors or SSL certificate issues).

• src/colmap/util/file.cc
  • Added retry loop for DownloadFile function to handle failed requests.
  • Introduced GetEnvInt helper function to read integer values from environment variables with default fallbacks.
  • Integrated std::chrono and std::thread for implementing delays between download retries.
  • Modified error handling within DownloadFile to trigger retries for certain CURLcode and HTTP response codes, while failing immediately for others.

• No activity has been recorded yet for this pull request.

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ahojnnes deleted the user/jsch/download-retry-backoff branch