Discipline for lock reassertion in a distributed file system

Details Discipline for lock reassertion in a distributed file system Discipline for lock reassertion in a distributed file system

2006-10-17

2006-10-17

Rimell, Sam (Department: 2164)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C709S203000

Reexamination Certificate

active

07124131

ABSTRACT:
A method and system for asserting a lock in a distributed file system is provided. All distributed locks have a lease for a limited time period, wherein the lease may be renewed periodically. A lock manager data structure is provided to maintain mode compatibility of locks granted to different client nodes for the same object. The process of acquiring or reasserting a lock includes determining whether there are other valid locks in use, as well as whether a valid lock is in operation in a conflicting or compatible mode with a requested lock. A new lock lease may be granted and a lock lease which has expired may be reasserted if a conflicting lease is not present.

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