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. 23, 2019
Filed:
Jan. 29, 2016
Walmart Apollo, Llc, Bentonville, AR (US);
Ergin Guney, San Francisco, CA (US);
Yan Zheng, San Jose, CA (US);
Walmart Apollo, LLC, Bentonville, AR (US);
Abstract
A system and method for maintaining consistency across a decentralized database cluster is presented. When a database server receives an index update message, it adds a message to a queue indicating it has received the message and watches an index update node. Once every server in the cluster has added a message to the queue or a timer has expired, it is known that every active database server has received the message. The update can be performed for each server and the changes committed simultaneously. In such a manner, all database servers in the cluster perform an update at approximately the same time. When a database server is unable to complete an update, it enters a fallen behind mode and performs updates more often, as configured in a configuration database. Other embodiments also are disclosed.