There are systems like Druid that memory map files and rely on the OS for paging in and out segments: http://druid.io/docs/latest/operations/performance-faq.htm

There are systems like Druid that memory map files and rely on the OS for paging in and out segments: http://druid.io/docs/latest/operations/performance-faq.html http://druid.io/docs/latest/operations/performance-faq.html