Chunk segment recovery via hierarchical erasure coding in a geographically diverse data storage system

A method, comprising:

• determining, by a system comprising a processor and a memory, an index of a first segment, wherein the first segment is comprised in a first chunk of a first zone of zones of a geographically diverse data storage system, and wherein the zones of the geographically diverse data storage system store data according to a hierarchical erasure coding scheme;
• determining, by the system, a second chunk of a second relevant zone of the zones based on the hierarchical erasure coding scheme, wherein the second chunk is determined to be a relevant chunk based on the hierarchical erasure coding scheme, and wherein the second zone is determined to be a relevant zone based on the hierarchical erasure coding scheme;
• determining, by the system, a second segment of the second relevant chunk, wherein the second segment is determined to be a relevant segment based on the index and the hierarchical erasure coding scheme;
• in response to receiving an indication that the first segment is inaccessible, replacing, by the system, the first segment with a first recovered segment that is determined based, at least in part, on the second segment and on the hierarchical erasure coding scheme, wherein the first recovered segment represents information that was represented on the first segment prior to the first segment becoming inaccessible.

A device, comprising:

• a processor;
• and
• a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising:
• in response to receiving an indication that a first segment is inaccessible, determining an index of the first segment, wherein the first segment is comprised in a first chunk of a first zone of zones of a geographically diverse data storage system, and wherein the zones of the geographically diverse data storage system store data according to a hierarchical erasure coding scheme;
• determining a second segment of a second chunk of a second zone of the zones based on the index and on the hierarchical erasure coding scheme, wherein the second segment, the second chunk, and the second zone are used in connection with a recovery of the first segment;
• replacing, by the system, the first segment with a first recovered segment that is determined based, at least in part, on the second segment and on the hierarchical erasure coding scheme, wherein the first recovered segment represents information that was represented on the first segment prior to the first segment becoming inaccessible.