ON STANDBY: v$dataguard_stats - various stats, including apply lag. v$dataguard_status - status messages related to dataguard. v$managed_standby - info on the standby ON PRIMARY v$archive_gap - shows the # of archived redo logs the standby is behind. Since we're shipping in real-time, this should nearly always be 0.
The Three-Body Problem is the first chance for English-speaking readers to experience this multiple award winning phenomenon from China's most beloved science fiction author, Liu Cixin.
Set against the backdrop of China's Cultural Revolution, a secret military project sends signals into space to establish contact with aliens. An alien civilization on the brink of destruction captures the signal and plans to invade Earth. Meanwhile, on Earth, different camps start forming, planning to either welcome the superior beings and help them take over a world seen as corrupt, or to fight against the invasion. The result is a science fiction masterpiece of enormous scope and vision.blogodex = {"idx" : ["Books", "Science Fiction", "Three Body Problem", "Liu Cixin"]};
"Requests takes all of the work out of Python HTTP/1.1 — making your integration with web services seamless. There’s no need to manually add query strings to your URLs, or to form-encode your POST data. Keep-alive and HTTP connection pooling are 100% automatic, powered by urllib3, which is embedded within Requests."References
If there's one thing to know about distributed systems, it's that they have to be designed with the expectation of failure. It's also safe to say that most software these days is, in some form, distributed—whether it's a database, mobile app, or enterprise SaaS. If you have two different processes talking to each other, you have a distributed system, and it doesn't matter if those processes are local or intergalactically displaced.
Marc Hedlund recently had a great post on Stripe's game-day exercises where they block off an afternoon, take a blunt instrument to their servers, and see what happens. We're talking like abruptly killing instances here—kill -9, ec2-terminate-instances, yanking on the damn power cord—that sort of thing. Everyone should be doing this type of stuff. You really don't know how your system behaves until you see it under failure conditions.http://www.bravenewgeek.com/sometimes-kill-9-isnt-enough/
from datetime import dateimport tornado.escapeimport tornado.ioloopimport tornado.webclass VersionHandler(tornado.web.RequestHandler): def get(self): response = { 'version': '3.5.1', 'last_build': date.today().isoformat() } self.write(response)class GetGameByIdHandler(tornado.web.RequestHandler): def get(self, id): response = { 'id': int(id), 'name': 'Crazy Game', 'release_date': date.today().isoformat() } self.write(response)application = tornado.web.Application([ (r"/getgamebyid/([0-9]+)", GetGameByIdHandler), (r"/version", VersionHandler)])if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()When you debug a distributed system or an OS kernel, you do it Texas-style. You gather some mean, stoic people, people who have seen things die, and you get some primitive tools, like a compass and a rucksack and a stick that’s pointed on one end, and you walk into the wilderness and you look for trouble, possibly while using chewing tobacco. As a systems hacker, you must be prepared to do savage things, unspeakable things, to kill runaway threads with your bare hands, to write directly to network ports using telnet and an old copy of an RFC that you found in the Vatican. When you debug systems code, there are no high-level debates about font choices and the best kind of turquoise, because this is the Old Testament, an angry and monochromatic world, and it doesn’t matter whether your Arial is Bold or Condensed when people are covered in boils and pestilence and Egyptian pharaoh oppression. HCI people discover bugs by receiving a concerned email from their therapist. Systems people discover bugs by waking up and discovering that their first-born children are missing and “ETIMEDOUT” has been written in blood on the wall.