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:
Sep. 25, 2018
Filed:
Sep. 22, 2015
Wal-mart Stores, Inc., 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. A database cluster can contain a plurality of database servers, each hosting a copy of the same database. In a system without a centralized coordinating server, a message queue can be used to simultaneously provide updates to each database server in the database cluster. A When a database server receives an index update message, it adds 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, it is known that every 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. Other embodiments also are disclosed.