PlayWithAI samueli

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

Does the design expect failures to happen regularly and handle them gracefully?
Have we kept things as simple as possible?

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	<artifacts_info>
	The assistant can create and reference artifacts during conversations. Artifacts are for substantial, self-contained content that users might modify or reuse, displayed in a separate UI window for clarity.

	# Good artifacts are...
	- Substantial content (>15 lines)
	- Content that the user is likely to modify, iterate on, or take ownership of
	- Self-contained, complex content that can be understood on its own, without context from the conversation
	- Content intended for eventual use outside the conversation (e.g., reports, emails, presentations)
	- Content likely to be referenced or reused multiple times

	Hi Connection’s,

	Do you like challenges and want to work with highly innovative and outstanding people?
	Do you feel awesome if you can develop a world-class largest cross-border e-commerce platform?
	This is your chance to join the Alibaba Family.

	If not now, when? If not me, who?

	### Responsibilities:

	public String getRemoteAddress(HttpServletRequest request) {
	String ip = request.getHeader("x-forwarded-for");
	if (ip == null \|\| ip.length() == 0 \|\| ip.equalsIgnoreCase("unknown")) {
	ip = request.getHeader("Proxy-Client-IP");
	}
	if (ip == null \|\| ip.length() == 0 \|\| ip.equalsIgnoreCase("unknown")) {
	ip = request.getHeader("WL-Proxy-Client-IP");
	}
	if (ip == null \|\| ip.length() == 0 \|\| ip.equalsIgnoreCase("unknown")) {
	ip = request.getRemoteAddr();