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Showing posts from August, 2013

Rewriting a large production system in Go

My team at Google is wrapping up an effort to rewrite a large production system (almost) entirely in Go. I say "almost" because one component of the system -- a library for transcoding between image formats -- works perfectly well in C++, so we decided to leave it as-is. But the rest of the system is 100% Go, not just wrappers to existing modules in C++ or another language. It's been a fun experience and I thought I'd share some lessons learned.

Why rewrite?

The first question we must answer is why we considered a rewrite in the first place. When we started this project, we adopted an existing C++ based system, which had been developed over the course of a couple of years by two of our sister teams at Google. It's a good system and does its job remarkably well. However, it has been used in several different projects with vastly different goals, leading to a nontrivial accretion of cruft. Over time, it became apparent that for us to continue to innovate rapidly wo…