Transparent failover

US8856582B2 · kind B2 · utility

Assignee

• Microsoft Corporation · US

Inventors

• Mathew George · Redmond, US
• David Kruse · Kirkland, US
• James T. Pinkerton · Sammamish, US
• Roopesh C. Battepati · Bellevue, US
• Tom Jolly · Redmond, US
• Paul R. Swan · Milpitas, US
• Mingdong Shang · Bellevue, US
• Daniel Edward Lovinger · Seattle, US

Key dates

• Filing date: Jun 30, 2011
• Grant date: Oct 7, 2014
• Expiry date: Dec 5, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F11/2038
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

Described are embodiments directed at persistent handles that are used to retain state across network failures and server failovers. Persistent handles are requested by a client after a session has been established with a file server. The request for the persistent handle includes a handle identifier generated by the client. The server uses the handle identifier to associate with state information. When there is a network failure or a server failover, and a reconnection to the client, the handle identifier is used to identify replayed requests that if replayed would create an inconsistent state on the server. The replayed requests are then appropriately handled.