The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 2008
Filed:
Oct. 29, 2004
Atul Adya, Redmond, WA (US);
Ronnie I. Chaiken, Woodinville, WA (US);
William J. Bolosky, Issaquah, WA (US);
Atul Adya, Redmond, WA (US);
Ronnie I. Chaiken, Woodinville, WA (US);
William J. Bolosky, Issaquah, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
An architecture and implementation for losslessly restarting subsystems in a distributed file system is described. By partitioning functionality and logging appropriately across the kernel and user-level boundaries on a client, the user-level subsystem may be made losslessly restartable. Practical mechanisms for supporting state-based recovery in replicated state machines and like replica are described. In particular, each client daemon may include an operations log and an applied log sequence number. Each client driver may include a potentially different operations log. Each client daemon may be configured to request logged operations associated with log sequence numbers in one or more ranges specified by a specification that includes the applied log sequence number. The requested logged operations may reside in the operations log maintained by a client driver. Each client daemon may operate in accordance with user-level constraints and each client driver may operate in accordance with kernel-level constraints.