{"id":148818,"date":"2025-11-19T11:11:55","date_gmt":"2025-11-19T09:11:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/mnogochasovoj-sboj-cloudflare-okazalsya-rezultatom-nekorrektnoj-obrabotki-oshibok"},"modified":"2025-11-19T11:11:55","modified_gmt":"2025-11-19T09:11:57","slug":"mnogochasovoj-sboj-cloudflare-okazalsya-rezultatom-nekorrektnoj-obrabotki-oshibok","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/mnogochasovoj-sboj-cloudflare-okazalsya-rezultatom-nekorrektnoj-obrabotki-oshibok","title":{"rendered":"Det mange timers nedbrud p\u00e5 Cloudflare viste sig at v\u00e6re et resultat af en forkert fejlh\u00e5ndtering","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Cloudflare har offentliggjort en analyse af en af de st\u00f8rste h\u00e6ndelser i deres infrastruktur, som for\u00e5rsagede, at det meste af content delivery netv\u00e6rket var ude af drift i over 3 timer i g\u00e5r. Fejlen opstod efter en \u00e6ndring i strukturen af databasen, der er gemt i ClickHouse, hvorefter filen med parametre til systemet til bek\u00e6mpelse af bots blev fordoblet i st\u00f8rrelse. Der blev dannet duplikerede tabeller i databasen, hvor SQL-foresp\u00f8rgslen til at generere filen blot hentede alle data fra alle tabeller efter n\u00f8gle, uden at filtrere duplikater. SELECT name, type FROM system.columns WHERE table = 'http_requests_features' order by name;

\"Det<\/center> <\/p>\n

Den genererede fil blev distribueret til alle noder i klusteret, der behandler indg\u00e5ende anmodninger. I handleren, der bruger denne fil til at kontrollere anmodninger fra bots, blev de angivne parametre gemt i hukommelsen, og der blev indf\u00f8rt en gr\u00e6nse for den maksimalt tilladte filst\u00f8rrelse for at beskytte mod un\u00f8digt hukommelsesforbrug. Under normale forhold var den faktiske filst\u00f8rrelse langt mindre end den angivne gr\u00e6nse, men efter duplikeringen af tabellerne overskred den gr\u00e6nsen. <\/p>\n

Problemet var, at i stedet for korrekt at h\u00e5ndtere overskridelsen af gr\u00e6nsen og forts\u00e6tte med at bruge den tidligere version af filen og informere overv\u00e5gningssystemet om den us\u00e6dvanlige situation, aktiveredes en n\u00f8dstop i handleren, som blokerede for videre trafik. Fejlen blev for\u00e5rsaget af brugen af metoden unwrap() med typen Result i Rust-koden.

\"Det<\/center> <\/p>\n

N\u00e5r v\u00e6rdien Result har tilstanden 'Ok', returnerer metoden unwrap() det tilknyttede objekt, men hvis resultatet ikke er succesfuldt \u2014 f\u00f8rer opkaldet til et nedbrud (makroen 'panic!' bliver kaldt). Normalt anvendes unwrap() under fejlfinding eller ved skrivning af testkode, og det anbefales ikke til brug i produktionsprojekter.

\"Det<\/center>
\"Det<\/center>
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0431\u043e\u043b\u0435\u0435 3 \u0447\u0430\u0441\u043e\u0432. \u0421\u0431\u043e\u0439 \u043f\u0440\u043e\u0438\u0437\u043e\u0448\u0451\u043b \u043f\u043e\u0441\u043b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0435 \u0411\u0414, \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d\u043d\u043e\u0439 \u0432 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435 ClickHouse, \u043f\u043e\u0441\u043b\u0435 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0444\u0430\u0439\u043b \u0441 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430\u043c\u0438 \u0434\u043b\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u0440\u043e\u0442\u0438\u0432\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0431\u043e\u0442\u0430\u043c \u0432 \u0434\u0432\u0430 \u0440\u0430\u0437\u0430 \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u043b\u0441\u044f \u0432 \u0440\u0430\u0437\u043c\u0435\u0440\u0435. \u0412 \u0411\u0414 \u0431\u044b\u043b\u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":148819,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-148818","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Langvarig Cloudflare-nedbrud var resultatet af forkert fejlh\u00e5ndtering | ProHoster","description":"Cloudflare har offentliggjort en analyse af en af de st\u00f8rste h\u00e6ndelser i sin infrastruktur, som resulterede i, at st\u00f8rstedelen af Content Delivery Network var nede i over 3 timer i 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