REDUNDANT SYSTEM, REDUNDANCY METHOD, AND COMPUTER-READABLE RECORDING MEDIUM

摘要

A primary system includes a first node and a second node that backs up the first node. A secondary system includes a third node and a fourth node that backs up the third node. The first node transmits data update information generated in response to a data update in the first node, to the second node and the third node. The fourth node determines a degree of progress in transactions indicated by data update information obtained through the second node and a degree of progress in transactions indicated by data update information obtained through the third node, identifies data update information indicating a further progressed transaction, and reflects the data update information in stored data of the fourth node.

主权项

1. A redundant system comprising:
a primary system including:
a first node; anda second node that backs up the first node; and a secondary system including:
a third node; anda fourth node that backs up the third node, wherein the first node in the primary system includes:
a processor that executes a first process including transmitting data update information to the second node and the third node, the data update information being generated in response to a data update in the first node, and the fourth node in the secondary system includes:
a processor that executes a second process including:determining a degree of progress in transactions indicated by the data update information obtained through the second node and a degree of progress in transactions indicated by the data update information obtained through the third node,specifying the data update information indicating a further progressed transaction, andreflecting the specified data update information to stored data of the fourth node.