Bug Hunting Adventures #16: Lame Surveillance

“Under observation, we act less free, which means we effectively are less free.”
― Edward Snowden

Imagine a distributed surveillance system where recorded video files are uploaded to a central server at regular intervalls.

Due to limitations of the transport protocol, video files must be split up in chunks and no chunk may exceed 1 GB (10^9 bytes). On top of that, in high-load scenarios, the server might shorten a chunk even more, in which case instead of N bytes only K bytes are transmitted. Naturally, the N-K bytes that were not transmitted need to be sent with the next chunk upload.

Everything works fine, all unit and system tests passed. Once deployed, however, sysadmins from the central server team started lamenting that the video files were arriving at a glacial pace. What’s wrong with this code?

Solution

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