Node.js hosting infrastructure on Acquia Cloud is comprised of a pair of load balancers and one or more web servers. It does not provide a caching layer. If your application requires caching, consider the following options:
* Rely on the caching layer on the Drupal side of the infrastructure
* Implement a CDN in front of the Node.js stack
* Build caching into the Node.js stack with one of the following packages: redis, memory-cache, nodecache, or flat-cache.