Nick Craver在他的blog上发了一篇2016版的Stack Overflow架构，其中的几组数据，有其令人印象深刻：
网站的统计数据：
- 209,420,973 (+61,336,090) HTTP requests to our load balancer
- 66,294,789 (+30,199,477) of those were page loads
- 1,240,266,346,053 (+406,273,363,426) bytes (1.24 TB) of HTTP traffic sent
- 569,449,470,023 (+282,874,825,991) bytes (569 GB) total received
- 3,084,303,599,266 (+1,958,311,041,954) bytes (3.08 TB) total sent
- 504,816,843 (+170,244,740) SQL Queries (from HTTP requests alone)
- 5,831,683,114 (+5,418,818,063) Redis hits
- 17,158,874 (not tracked in 2013) Elastic searches
- 3,661,134 (+57,716) Tag Engine requests
- 607,073,066 (+48,848,481) ms (168 hours) spent running SQL queries
- 10,396,073 (-88,950,843) ms (2.8 hours) spent on Redis hits
- 147,018,571 (+14,634,512) ms (40.8 hours) spent on Tag Engine requests
- 1,609,944,301 (-1,118,232,744) ms (447 hours) spent processing in ASP.Net
- 22.71 (-5.29) ms average (19.12 ms in ASP.Net) for 49,180,275 question page renders
- 11.80 (-53.2) ms average (8.81 ms in ASP.Net) for 6,370,076 home page renders
目前的架构：
- 4 Microsoft SQL Servers (new hardware for 2 of them)
- 11 IIS Web Servers (new hardware)
- 2 Redis Servers (new hardware)
- 3 Tag Engine servers (new hardware for 2 of the 3)
- 3 Elasticsearch servers (same)
- 4 HAProxy Load Balancers (added 2 to support CloudFlare)
- 2 Networks (each a Nexus 5596 Core + 2232TM Fabric Extenders, upgraded to 10Gbps everywhere)
- 2 Fortinet 800C Firewalls (replaced Cisco 5525-X ASAs)
- 2 Cisco ASR-1001 Routers (replaced Cisco 3945 Routers)
- 2 Cisco ASR-1001-x Routers (new!)
Nick说他会写一个系列，非常期待后续的详细介绍。