Some times for performance, availability or scalability reasons, we may need to rewrite an application that was previously working with an SQL database to fit a NoSQL usage or even hybrid one: a part of data will remain relational and the other part not relational
In this post (https://zoumana.wordpress.com/2014/06/16/zero-downtime-deploiement-sur-tomcat7/), i talked about the Zero Downtime deployment feature inside tomcat 7 and later.
To summary this was about deploying a newer version of the same app within the same tomcat container keeping the previous WAR serving the HTTP requests until the new version is successfully deployed to take over the next users’ requests.
Today the target is the same: avoiding to take an application off-line during an upgrade for the happiness of end users 🙂 but through one of Amazon Web Services feature: Elastic Load Balancer! Lire la suite
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