Liferay leverages a third-party solution to provide caching of data on its system -- whether running on a single server or clustered. The current implementation (Liferay 6.0) uses EhCache; prior to 4.3.1, Liferay was using OSCache.

• Caching (EhCache) - Current (4.3.1+)
• Caching (OSCache) - for Liferay 4.3.0 and earlier