Final answer:
Yes, it is possible to upgrade a web app in place without downtime by implementing techniques such as load balancing, blue-green deployments, and rolling updates.
Step-by-step explanation:
Yes, it is possible to upgrade a web app in place without downtime. This can be achieved by implementing techniques such as load balancing, blue-green deployments, and rolling updates.
Load balancing involves distributing incoming requests among multiple instances of the web app, allowing for upgrades to be performed on one instance at a time without affecting the overall availability of the app. Blue-green deployments involve running two versions of the web app concurrently, with one version serving live traffic and the other version being upgraded. Rolling updates involve gradually updating a web app by replacing old instances with new ones, ensuring that the app remains available during the upgrade process.
Therefore, the ability to upgrade a web app in place without downtime depends on the specific web app and its architecture, as well as the implementation of appropriate deployment strategies.