Download Amazon ElastiCache User Guide

Amazon ElastiCache User Guide
Cache Engine Version Management
Description
Documentation
How to get started using Amazon VPC
Amazon VPC Getting Started Guide
How to use Amazon VPC through the AWS Management Console
Amazon VPC User Guide
Complete descriptions of all the Amazon VPC
commands
Amazon EC2 Command Line Reference
(the Amazon VPC commands are part of the
Amazon EC2 reference)
Complete descriptions of the Amazon VPC API
actions, data types, and errors
Amazon EC2 API Reference
(the Amazon VPC API actions are part of the
Amazon EC2 reference)
Information for the network administrator who
needs to configure the gateway at your end of an
optional IPsec VPN connection
Amazon VPC Network Administrator Guide
For more detailed information about Amazon Virtual Private Cloud, go to http://www.amazonaws.cn/vpc.
Cache Engine Version Management
You can control if and when the protocol-compliant software powering your cache cluster is upgraded to
new versions that are supported by ElastiCache.This level of control enables you to maintain compatibility
with specific Memcached or Redis versions, test new versions with your application before deploying in
production, and perform version upgrades on your own terms and timelines.
Because version upgrades involve some compatibility risk, they will not occur automatically and must be
initiated by you. You initiate version upgrades to your cluster by modifying the cluster and specifying a
new engine version.
Note
Although cache engine version management functionality is intended to give you as much control
as possible over how patching occurs, ElastiCache reserves the right to patch your cluster on
your behalf in the event of a critical security vulnerability in the system or cache software.
Warning
Changing a cache engine version is a disruptive process which clears all cache data in the
cluster.
Maintenance Window
Every cluster has a weekly maintenance window during which any system changes are applied. If you
don't specify a preferred maintenance window when you create or modify a cache cluster, ElastiCache
assigns a 60-minute maintenance window on a randomly selected day of the week.
The 60-minute maintenance window is selected at random from an 8-hour block of time per region. The
following table lists the time blocks for each region from which the default maintenance windows are
assigned.
API Version 2015-02-02
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