{"id":2244,"date":"2009-12-04T19:41:46","date_gmt":"2009-12-04T18:41:46","guid":{"rendered":"http:\/\/www.ziserman.com\/blog\/?p=2244"},"modified":"2009-12-04T19:42:53","modified_gmt":"2009-12-04T18:42:53","slug":"critere-de-qualite-la-robustesse","status":"publish","type":"post","link":"https:\/\/www.ziserman.com\/blog\/2009\/12\/04\/critere-de-qualite-la-robustesse\/","title":{"rendered":"Crit\u00e8re de qualit\u00e9 – La robustesse"},"content":{"rendered":"

Quand un site e-commerce grossit, que le site repr\u00e9sente plusieurs millions d’euros, la qualit\u00e9 du site prend de plus en plus d’importance<\/strong>.<\/p>\n

Ce n’est pas le cas au d\u00e9but<\/strong>, au lancement d’un site e-commerce.<\/p>\n

Mettre la barre trop haut, au lancement d’un site n’est pas forc\u00e9ment une bonne id\u00e9e, parce que la qualit\u00e9 \u00e0 un prix…<\/p>\n

Pour faire simple, au d\u00e9marrage, il vaut mieux privil\u00e9gier le e-marketing, et accepter de prendre certains risques <\/strong>au niveau de la qualit\u00e9 de la solution.<\/p>\n

La qualit\u00e9 se mesure par plusieurs crit\u00e8res.<\/p>\n

Le crit\u00e8re que je propose de creuser un petit peu ce soir, c’est la robustesse.<\/p>\n

C’est quoi la robustesse ?<\/p>\n

La robustesse, en informatique, c’est la capacit\u00e9 qu’\u00e0 une solution informatique \u00e0 se comporter le mieux possible, m\u00eame quand \u00ab\u00a0le monde s’\u00e9croule\u00a0\u00bb<\/strong>.<\/p>\n

Concr\u00e8tement, cela veut dire, pour un site e-commerce, que le site doit continuer \u00e0 fonctionner m\u00eame si des incidents surviennent, \u00e0 diff\u00e9rents endroits (un serveur qui s’arr\u00eate, un service tiers qui ne r\u00e9pond plus, …).<\/p>\n

Bien s\u00fbr, on ne peut pas demander \u00e0 ce que le service continue \u00ab\u00a0comme si de rien n’\u00e9tait\u00a0\u00bb alors que des services cl\u00e9s ne r\u00e9pondent plus. Mais on peut demander \u00e0 ce que la d\u00e9gradation du service soit contr\u00f4l\u00e9e et progressive.<\/p>\n

Exemple : le lien avec la logistique tombe, et le site Front office n’a plus les infos de stock.<\/p>\n

On peut tout \u00e0 fait imaginer que le Front ai une sorte de cache, et qu’il puisse continuer \u00e0 effectuer des ventes, en s’appuyant sur le stock g\u00e9r\u00e9 en cache.<\/p>\n

Autre exemple : sur pecheur.com, il y a deux syst\u00e8mes de paiement CB, ind\u00e9pendants. C’est une solution (simple pour le coup) pour permettre de vendre \u00e0 tout instant, m\u00eame si l’une des plateformes de paiement tombe.<\/p>\n

Pour un service Web, la robustesse, c’est \u00e9galement bien se comporter quand le site doit supporter une charge trop importante.<\/p>\n

Exemple de strat\u00e9gie : au lieu de ne plus rien r\u00e9pondre, le site peut s’adapter \u00e0 la mont\u00e9e en charge, en se d\u00e9lestant de certaines fonctions (merchandising par exemple) pas compl\u00e8tement indispensables.<\/p>\n

C’est toujours mieux que de laisser tous les clients attendre devant une page qui s’affiche \u00e0 la mode des ann\u00e9es 80.<\/p>\n

C’est finalement assez cher de concevoir une solution vraiment robuste. Il faut doubler les serveurs, mettre en place des processus pour g\u00e9rer les diff\u00e9rents cas de panne, concevoir une architecture avec des composants assez ind\u00e9pendants, faire des tests, …<\/p>\n

Mais c’est clairement indispensable et rentable pour un gros site, ou il est carr\u00e9ment impensable que le service s’arr\u00eate.<\/p>\n","protected":false},"excerpt":{"rendered":"

Quand un site e-commerce grossit, que le site repr\u00e9sente plusieurs millions d’euros, la qualit\u00e9 du site prend de plus en plus d’importance. Ce n’est pas le cas au d\u00e9but, au lancement d’un site e-commerce. Mettre la barre trop haut, au lancement d’un site n’est pas forc\u00e9ment une bonne id\u00e9e, parce que la qualit\u00e9 \u00e0 un […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[2],"tags":[379,371,184,139],"class_list":["post-2244","post","type-post","status-publish","format-standard","hentry","category-e-commerce","tag-araok","tag-e-commerce","tag-genie-logiciel","tag-systeme-dinformation"],"yoast_head":"\nCrit\u00e8re de qualit\u00e9 - La robustesse - Ziserman.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ziserman.com\/blog\/2009\/12\/04\/critere-de-qualite-la-robustesse\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Crit\u00e8re de qualit\u00e9 - La robustesse - Ziserman.com\" \/>\n<meta property=\"og:description\" content=\"Quand un site e-commerce grossit, que le site repr\u00e9sente plusieurs millions d’euros, la qualit\u00e9 du site prend de plus en plus d’importance. 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