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Intro
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2014 Google I/O: What's Go?
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Kiln's SSH Reverse Proxy
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Why Rewrite?
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Tons of Concurrency 1. Accepts SSH connection (1 goroutine) 2. Authenticates via public/private key 3. Connects to backend server 4. Proxies STDIN, STDOUT, and STDERR (3 goroutines)
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Resiliency: The Process
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Careful Coding: Error Handling & Clean-up
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Not Necessarily.
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Careful Coding: Channels
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Careful Coding: Panics!
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Careful Coding: Avoid Race Conditions!
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goroutines Should be used in unit tests, development, and testing environments
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Careful Coding: Implement Timeouts
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Network Timeouts: • network dial timeout • network connection inactivity timeout • total connection timeout
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Know Your Service: How Does It Use Memory?
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How much memory per connection? • Does the system reclaim memory that's no longer used? • What's the garbage collector doing? CODEBUG=gctrace=1 • Where is memory allocated? (PPROF)
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Know Your Service: PPROF
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Don't leak goroutines!
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PPROF: From the Command Line
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Know Your Service: Watch It Run
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Keep Good Logs! • Create a semi-unique string per request • Use this request string as a prefix in all log entries • Always log at least the start and end of a request
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Drain and Die
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Game Day.
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Wolfram Alpha Tells Me: 4MB X 10 = 40MB
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Prod Profiling Told Me: This memory will be reclaimed
Description:
Explore the development of Fog Creek's first production Go service in this GopherCon 2015 talk. Learn how to build resilient services using Go by examining the rewrite of a Git and Mercurial SSH reverse proxy from Python. Discover techniques for monitoring memory, tracking user connections and actions, implementing drain-and-die functionality, and creating detailed forensic logs. Gain insights into improving response times, extending uptime, and enhancing crash analysis. Delve into topics such as concurrency, error handling, channel usage, panic management, race condition avoidance, timeout implementation, and memory optimization. Understand the importance of proper logging, profiling with PPROF, and conducting game day exercises. Apply these lessons to create robust and efficient Go services in your own projects.

Uptime - Building Resilient Services with Go

Gopher Academy
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#Conference Talks #GopherCon #Computer Science #Memory Management #Memory Leaks
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Intro