Coordinating updates to replicated data

Details Coordinating updates to replicated data Coordinating updates to replicated data

2011-08-09

2011-08-09

Vy, Hung T (Department: 2164)

Data processing: database and file management or data structures

File or database maintenance

Synchronization

C707S616000, C707S638000

Reexamination Certificate

active

07996360

ABSTRACT:
Techniques for coordinating updates to replicated data are disclosed. For example, in a system comprised of a plurality of nodes, a method for maintaining consistent copies of data across the nodes comprises the following steps. A copy of an object o1is maintained by a plurality of nodes. In response to a request r1to update a copy of object o1, a message is sent to at least some of the plurality of nodes instructing a node receiving the message to invalidate its copy of object o1. In response to a node n1receiving an invalidation message arising from r1wherein n1is processing another request r2to update object o1, requests r1and r2are coordinated to prevent the requests from causing conflicting updates or invalidations.

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