Routing to obtain user data in a geographically distributed data storage environment
Abstract:
The described technology is generally directed towards obtaining data, such as corresponding to a read request, from a geographic zone which may not be the zone that owns the data. When a request for data (e.g., a data segment) is received by a zone that does not own the requested data, the zone evaluates statistical data to determine whether it is more efficient to obtain the requested data directly from the zone that owns the data, or indirectly from one or more zones that contain related data from which the requested data can be reconstructed. If the indirect route is deemed sufficiently more efficient, the reconstruction data (e.g., counterpart segments) are obtained, and processed into the requested data, e.g., by XOR-ing the counterpart data segments into the requested data segment for returning to the client.
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