System for queue based object cloning

A system, comprising:

• one or more processors;
• one or more storage devices storing a first object;
• a non-volatile memory;
• and
• computer-readable storage media encoded with instructions that, when executed on the one or more processors, instruct the one or more processors to perform acts for copying the first object which stores a plurality of second objects which are at least partially stored on the one or more storage devices according to an organization of the second objects in a first queue managed by the one or more processors, the acts comprising:
• cloning, according to positions of the second objects in the first queue, the second objects, which are unmodified since a last system checkpoint and stored on the one or more storage devices, and thereafter removing the second objects which have been cloned from the first queue;
• moving the second objects, which have been modified since the last system checkpoint and stored in the non-volatile memory, from the first queue to a second queue managed by the one or more processors;
• creating a new asynchronous system checkpoint when the second objects, which have been modified since the last system checkpoint, are moved to the second queue;
• moving the second objects from the second queue to the first queue after creating the new asynchronous system checkpoint;
• and
• cloning, according to positions of the second objects in the first queue, the second objects, which are unmodified since the new asynchronous system checkpoint and which are stored on the one or more storage devices by creating the new asynchronous checkpoint, and thereafter removing the second objects which have been cloned from the first queue.