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.

6. 24/7

7. 24/7/365

8. 24/7/365

9. 24/365

10. 24/365
(24/7/52)

15. WEB
200 000
APP
700 000
API
700 000
(+300 000)

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

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

43. $ 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"
]
}

47. Statistik för Sun 2013-05-19
============================
Antal sökningar
---------------
Searches: 918967
Klienter
--------
WEB: 84957 (9.245%)
IPHONE: 414562 (45.112%)
IPAD: 1554 (0.169%)
ANDROID: 110725 (12.049%)
REST: 306560 (33.359%)
XHTML: 609 (0.066%)

48. Typ av förfrågningar
--------------------
XMLCON (till/från eller till och från address): 347464 (37.810%)
XMLSTATIONBOARD (nästa tur): 326501 (35.529%)
XMLCON-BASIC (till och från hållplats): 117693 (12.807%)
XMLLOCATING (sökning med gps från mobilen): 110491 (12.023%)
XMLJOURNEY: 6815 (0.742%)
XMLTARIFF (prisförfrågning): 5678 (0.618%)
XMLGIS: 3871 (0.421%)
XMLSIMPLEHANDLESTRING (SMS): 454 (0.049%)

49. Svarstider för beräkningar
--------------------------
0.00s: 657046 (71.498%)
0.01s: 48629 (5.292%)
0.02s: 20615 (2.243%)
0.03s: 25596 (2.785%)
0.04s: 20940 (2.279%)
0.05s: 4842 (0.527%)
0.06s: 8245 (0.897%)
0.07s: 11930 (1.298%)
0.08s: 5899 (0.642%)
0.09s: 4966 (0.540%)
---
0.0s: 808708 (88.002%)
0.1s: 99959 (10.877%)
0.2s: 4214 (0.459%)
0.3s: 1656 (0.180%)
0.4s: 1212 (0.132%)
0.5s: 928 (0.101%)
0.6s: 679 (0.074%)
0.7s: 446 (0.049%)
0.8s: 242 (0.026%)
0.9s: 181 (0.020%)
---
0s: 918225 (99.919%)
1s: 652 (0.071%)
2s: 72 (0.008%)
3s: 4 (0.000%)
4s: 1 (0.000%)
5s: 2 (0.000%)
8s: 1 (0.000%)
32s: 1 (0.000%)

54. Svarstider för beräkningar
--------------------------
0.00s: 657046 (71.498%)
0.01s: 48629 (5.292%)
0.02s: 20615 (2.243%)
0.03s: 25596 (2.785%)
0.04s: 20940 (2.279%)
0.05s: 4842 (0.527%)
0.06s: 8245 (0.897%)
0.07s: 11930 (1.298%)
0.08s: 5899 (0.642%)
0.09s: 4966 (0.540%)
---
0.0s: 808708 (88.002%)
0.1s: 99959 (10.877%)
0.2s: 4214 (0.459%)
0.3s: 1656 (0.180%)
0.4s: 1212 (0.132%)
0.5s: 928 (0.101%)
0.6s: 679 (0.074%)
0.7s: 446 (0.049%)
0.8s: 242 (0.026%)
0.9s: 181 (0.020%)
---
0s: 918225 (99.919%)
1s: 652 (0.071%)
2s: 72 (0.008%)
3s: 4 (0.000%)
4s: 1 (0.000%)
5s: 2 (0.000%)
8s: 1 (0.000%)
32s: 1 (0.000%)

59. Federico Hernandez
fh@vasttrafik.se
@feddeco
@vasttrafikapi