Adjusting Redundancy In An Erasure Code Object Store To Account For Varying Data Value

摘要

Example apparatus and methods control the number of rateless erasure codes (e.g., fountain codes) stored in an object store for an item (e.g., file stored as object). The codes for the item may be generated according to an M/N policy. A first safety factor that controls how many codes are stored initially in the object store is identified. A first number of codes are then stored in the object store, where the first number is selected as a function of the first safety factor. A second safety factor for the item and a condition under which the second safety factor is to be used to control the number of codes to be stored in the object store is also identified. When the condition is detected, a second number of codes are stored in the object store, where the second number is selected as a function of the second safety factor.