How to keep a popular API up an running 24 hours a day, 365 days a year. Presentation by Federico Hernandez, Västtrafik from Nordic APIs Copenhagen in May 2013.

2. Federico Hernandez

4. 24/7

5. 24/7/365

6. 24/7/365

7. 24/365

8. 24/365
!
(24/7/52)

13. WEB ??? 000
APP ??? 000
API ??? 000

16. Write program that do
one thing and
do it well
Unix philosophy
Doug McIlroy

41. $ curl localhost:5432/cmi/status
{
"nodeTime": "2013-05-20T13:41:52",
"activeSubscriptions": 892,
"totalNumberOfSubscribers": 1019,
"totalNumberOfSubscriptions": 1801,
"sentMessagesPerMinute": 0,
"tsConnections": [
"HafasServerClient [be1/123.456.789.123:40301], managed connections: 232",
"HafasServerClient [be1/123.456.789.123:40302], managed connections: 251",
"HafasServerClient [be2/123.456.789.125:40301], managed connections: 234",
"HafasServerClient [be2/123.456.789.125:40302], managed connections: 212"
]
}

45. Statistik för Mon 2014-05-05
============================
!
Antal sökningar
---------------
Searches: 1203498
!
!
Klienter
--------
WEB: 100323 (8.336%)
IPHONE: 611811 (50.836%)
IPAD: 1519 (0.126%)
ANDROID: 235191 (19.542%)
REST: 251549 (20.901%) [internal usage] (external ca. 800000)
XHTML: 3105 (0.258%)
!
!
Typ av förfrågningar
--------------------
XMLCON (till/från eller till och från address): 525031 (43.625%)
XMLSTATIONBOARD (nästa tur): 289010 (24.014%)
XMLCON-BASIC (till och från hållplats): 200035 (16.621%)
XMLLOCATING (sökning med gps från mobilen): 163346 (13.573%)
XMLJOURNEY: 13547 (1.126%)
XMLTARIFF (prisförfrågning): 6091 (0.506%)
XMLGIS: 5778 (0.480%)
XMLSIMPLEHANDLESTRING (SMS): 660 (0.055%)

46. Svarstider för beräkningar
--------------------------
0.00s: 937282 (77.880%)
0.01s: 52655 (4.375%)
0.02s: 36363 (3.021%)
0.03s: 12238 (1.017%)
0.04s: 19583 (1.627%)
0.05s: 12027 (0.999%)
0.06s: 9823 (0.816%)
0.07s: 8682 (0.721%)
0.08s: 8591 (0.714%)
0.09s: 9058 (0.753%)
---
0.0s: 1106302 (91.924%)
0.1s: 32175 (2.673%)
0.2s: 32400 (2.692%)
0.3s: 13499 (1.122%)
0.4s: 6921 (0.575%)
0.5s: 3412 (0.284%)
0.6s: 2327 (0.193%)
0.7s: 1688 (0.140%)
0.8s: 1047 (0.087%)
0.9s: 706 (0.059%)
---
0s: 1200477 (99.749%)
1s: 2481 (0.206%)
2s: 291 (0.024%)
3s: 38 (0.003%)
4s: 15 (0.001%)
5s: 166 (0.014%)
6s: 5 (0.000%)
7s: 1 (0.000%)

53. Eric Raymond’s 17 Unix
Rules
...!
Rule of Modularity!
Rule of Composition!
Rule of Separation!
Rule of Simplicity!
Rule of Parsimony!
Rule of Robustness!
...

58. Federico Hernandez!
fh@vasttrafik.se
f@ederi.co!
@feddeco
@vasttrafikapi