Distributed hybrid caching provides intelligent cache invalidation across multiple ATG instances. Unlike distributed JMS and TCP caching, which broadcast invalidation events to all participating servers, distributed hybrid caching sends invalidation events only to servers where the items are cached, which can significantly reduce network traffic.
Distributed hybrid caching is suitable for sites with the following requirements:
Real-time access to item changes
Large number of items to monitor across many clients
To achieve optimal performance, a site that uses distributed hybrid caching must provide enough server memory to support a GSACacheServerManager that can monitor all distributed hybrid items; and clients must have enough memory to cache locally all distributed hybrid items. For more information, see Optimizing Performance later in this chapter.
