A method for an in-memory distributed cache includes receiving a write request from a client device to write a block of client data in random access memory (RAM) of a memory host and determining whether to allow the write request by determining whether the client device has permission to write the block of client data at the memory host, determining whether the block of client data is currently saved at the memory host, and determining whether a free block of RAM is available. When the client device has permission to write the block of client data at the memory host, the block of client data is not currently saved at the memory host, and a free block of RAM is available, the write request is allowed and the client is allowed to write the block of client data to the free block of RAM.