Efficient flash memory-based object store

A distributed object store, comprising:na plurality of solid state devices, wherein the distributed object store stores objects on the plurality of solid state devices;a transaction model means for ensuring the distributed object store performing transactions in compliance with atomicity, concurrency, isolation, and durability (ACID) properties;means for providing parallel flushing in a write cache maintained on each of the plurality of solid state devices; andmeans for maintaining one or more double-write buffers, for the distributed object store, at a location other than the plurality of solid state devices.

A method for durably storing data blocks maintained in a volatile cache on a solid state device, comprising:ninstantiating a plurality of threads that are each configured to perform work according to one of a plurality of stages,wherein the plurality of stages include:na first stage in which a thread identifies, in the volatile cache of a server that issues write requests to an object store maintained on one or more solid state devices, a first set of data blocks to write to a double-write buffer cache in non-volatile dynamic random access memory (DRAM),a second stage in which a thread writes a second set of data blocks from the volatile cache to the double-write buffer,a third stage in which a thread writes data from the double-write buffer to the one or more solid state devices, andwherein the plurality of threads include at least two threads that are both operating in different stages of the plurality of stages.

A distributed object store, comprising:none or more processors on one or more machines; anda machine readable medium storing one or more sequences of instructions, which when executed by the one or more processors, cause:nmaintaining the distributed object store on the plurality of solid state devices, wherein the distributed object store stores objects using a transaction model that ensures compliance with atomicity, concurrency, isolation, and durability (ACID) properties;the distributed object store providing parallel flushing in a write cache maintained on each of the plurality of solid state devices; andthe distributed object store maintaining one or more double-write buffers, for the distributed object store, at a location other than the plurality of solid state devices.

A machine readable storage medium storing one or more sequences of instructions for durably storing data blocks maintained in a volatile cache on a solid state device, wherein execution of the one or more sequences of instruction cause:ninstantiating a plurality of threads that are each configured to perform work according to one of a plurality of stages,wherein the plurality of stages include:na first stage in which a thread identifies, in the volatile cache of a server that issues write requests to an object store maintained on one or more solid state devices, a first set of data blocks to write to a double-write buffer cache in non-volatile dynamic random access memory (DRAM),a second stage in which a thread writes a second set of data blocks from the volatile cache to the double-write buffer,a third stage in which a thread writes data from the double-write buffer to the one or more solid state devices, andwherein the plurality of threads include at least two threads that are both operating in different stages of the plurality of stages.