Dynamic capacity optimization for shared computing resources

A system comprising:

• data processing hardware;
• and
• memory hardware in communication with the data processing hardware, the memory hardware storing instructions that when executed on the data processing hardware cause the data processing hardware to perform operations comprising:
• receiving, from an online entity of a plurality of online entities, a requested amount of capacity of a computing resource shared by the plurality of online entities, the computing resource comprising a resource capacity limitation;
• identifying a reservation zone from a plurality of reservation zones that corresponds to the online entity, each reservation zone of the plurality of reservation zones designating a maximum amount of unused capacity of the computing resource that may be reserved by corresponding online entities, wherein a sum of the maximum amount of unused capacity designated by each reservation zone of the plurality of reservation zones exceeds the resource capacity limitation of the computing resource;
• determining whether the requested amount of capacity of the computing resource is less than the maximum amount of unused capacity designated by the identified reservation zone;
• and
• in response to determining that the requested amount of capacity of the computing resource is less than the maximum amount of unused capacity designated by the identified reservation zone, allocating the requested amount of capacity of the computing resource to the online entity.