1. A method, comprising: generating a data structure corresponding to a set of client nodes selected from a plurality of client nodes; storing, in the data structure, objects from the selected set of client nodes; determining that an object corresponding to a client node of the selected set of client nodes has to be stored; determining whether the object has already been stored in the data structure by any client node of the selected set of client nodes; and storing the object in the data structure, in response to determining that the object has not already been stored in the data structure by any client node of the selected set of client nodes.