Replication
有备无患。
wikipedia Replication (computing)
Replication in computing involves sharing information so as to ensure consistency between redundant resources, such as software or hardware components, to improve reliability, fault-tolerance, or accessibility.
wikipedia Redundancy (engineering)
两种方式
master slave
这种方式比较广泛的,比如:
1、Redis sentinel HA就是采用的这种方式
成组
其实这也是一种replication,在下面的文章中,介绍了这种用法:
1、Redis doc Partitioning: how to split data among multiple Redis instances
It is not a single point of failure since you can start multiple proxies and instruct your clients to connect to the first that accepts the connection.
显然,是通过成组来避免**single point of failure** 。