{"id":10614,"date":"2013-08-06T20:40:08","date_gmt":"2013-08-07T01:40:08","guid":{"rendered":"http:\/\/bucktownbell.com\/?p=10614"},"modified":"2013-10-20T21:16:43","modified_gmt":"2013-10-21T02:16:43","slug":"a-storm-of-servers-how-the-leap-second-led-facebook-to-dcim","status":"publish","type":"post","link":"http:\/\/bucktownbell.com\/?p=10614","title":{"rendered":"A Storm of Servers: How the Leap Second Led Facebook to DCIM"},"content":{"rendered":"<blockquote><p>Last July 1, that scenario became real as the \u201cLeap Second\u201d bug caused many Linux servers to get stuck in a loop, endlessly checking the date and time. At the Internet\u2019s busiest data centers, power usage almost instantly spiked by megawatts, stress-testing the facility\u2019s power load and the user\u2019s capacity planning.<\/p><\/blockquote>\n<p>via <a href=\"http:\/\/www.datacenterknowledge.com\/archives\/2013\/08\/06\/server-storm\/\">A Storm of Servers: How the Leap Second Led Facebook to DCIM<\/a>.<\/p>\n<blockquote><p>What was happening? The additional second caused particular problems for Linux systems that use the Network Time Protocol (NTP) to synchronize their systems with atomic clocks. The leap second caused these systems to believe that time had \u201cexpired,\u201d triggering a loop condition in which the system endlessly sought to check the date, spiking CPU usage and power draw.<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Last July 1, that scenario became real as the \u201cLeap Second\u201d bug caused many Linux servers to get stuck in a loop, endlessly checking the date and time. At the Internet\u2019s busiest data centers, power usage almost instantly spiked by &hellip; <a href=\"http:\/\/bucktownbell.com\/?p=10614\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[284],"tags":[41,187,700],"class_list":["post-10614","post","type-post","status-publish","format-standard","hentry","category-servers","tag-data-centers","tag-facebook","tag-ntp"],"_links":{"self":[{"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/posts\/10614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10614"}],"version-history":[{"count":2,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/posts\/10614\/revisions"}],"predecessor-version":[{"id":10616,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=\/wp\/v2\/posts\/10614\/revisions\/10616"}],"wp:attachment":[{"href":"http:\/\/bucktownbell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10614"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/bucktownbell.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}