Abstract: The subject matter of this specification can be implemented in, among other things, a method that includes pre-registering, at a client device, one or more input/output (IO) buffers for a remote direct memory access (RDMA) interface at the client device. In response to pre-registering the one or more IO buffers at the client device, an application executed by the client device is provided with access to a distributed file system through the RDMA interface. In response to determining that data of a requested file in the distributed file system has been designated for caching, a first IO buffer among the IO buffers is designated as a cache for the data of the file. The data for the file is received via the RDMA interface and from the distributed file system, for the first IO buffer.

Abstract: The subject matter of this specification can be implemented in, among other things, a method that includes pre-registering multiple memory regions for input/output (IO) buffers of a remote direct memory access (RDMA) interface. The method includes receiving a buffer reservation request from a non-system-based user (NSBU) application through an application programming interface (API). The method includes reserving for the NSBU application a first IO buffer. The method includes receiving a request from the NSBU application through the API to access a file in a distributed file system. The method includes receiving data for the file in the first IO buffer from the distributed file system using the RDMA interface or providing data for the file from the first IO buffer to the distributed file system using the RDMA interface. The method includes receiving a request from the NSBU application through the API to free the first IO buffer.

Abstract: The subject matter of this specification can be implemented in, among other things, a method that includes pre-registering, at a client device, one or more input/output (IO) buffers for a remote direct memory access (RDMA) interface at the client device. In response to pre-registering the one or more IO buffers at the client device, an application executed by the client device is provided with access to a distributed file system through the RDMA interface. In response to determining that data of a requested file in the distributed file system has been designated for caching, a first IO buffer among the IO buffers is designated as a cache for the data of the file. The data for the file is received via the RDMA interface and from the distributed file system, for the first IO buffer.

Abstract: The subject matter of this specification can be implemented in, among other things, a method that includes pre-registering, by a processing device at a client device, multiple input/output (IO) buffers at the client device with a remote direct memory access (RDMA) interface at the client device. The client device accesses multiple server devices of a distributed file system using the RDMA interface. The method further includes receiving a request to access a file in the distributed file system from an application at the client device. The method further includes designating a first IO buffer among the IO buffers as a cache for data from the file. The method further includes receiving the data for the file in the first IO buffer from the distributed file system using the RDMA interface.

Abstract: The subject matter of this specification can be implemented in, among other things, a method that includes pre-registering multiple memory regions for input/output (IO) buffers of a remote direct memory access (RDMA) interface. The method includes receiving a buffer reservation request from a non-system-based user (NSBU) application through an application programming interface (API). The method includes reserving for the NSBU application a first IO buffer. The method includes receiving a request from the NSBU application through the API to access a file in a distributed file system. The method includes receiving data for the file in the first IO buffer from the distributed file system using the RDMA interface or providing data for the file from the first IO buffer to the distributed file system using the RDMA interface. The method includes receiving a request from the NSBU application through the API to free the first IO buffer.