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:
Dec. 22, 2009
Filed:
Jun. 27, 2006
William R. Hoffman, Berkeley, CA (US);
Marcus J. Jager, Boulder Creek, CA (US);
John P. Maccormick, San Francisco, CA (US);
Kristof Roomp, Seattle, WA (US);
Chandramohan A. Thekkath, Palo Alto, CA (US);
Lidong Zhou, Sunnyvale, CA (US);
William R. Hoffman, Berkeley, CA (US);
Marcus J. Jager, Boulder Creek, CA (US);
John P. MacCormick, San Francisco, CA (US);
Kristof Roomp, Seattle, WA (US);
Chandramohan A. Thekkath, Palo Alto, CA (US);
Lidong Zhou, Sunnyvale, CA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A global state management service manages replication in a distributed system. A distributed system can have several replica groups. The global state management service manages state associated with each replica group. Data replication is implemented without implementing an instance of a state machine on each device in a replica group. A replica group comprises a primary device and at least one secondary device. Each device in a replica group contains a replica of data of interest. The global state management service manages the allocation of primary and secondary devices. In the absence of a failure in either a primary device or a secondary device, read and write operations are performed without consulting the global state management service. When a failure is detected, the global state management service manages failover.