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Amazon ElastiCache
ElastiCache for Memcached User Guide (API Version 2015-02-02)

ElastiCache for Memcached Documentation History

  • API version: 2015-02-02

  • Latest documentation update: April 20, 2018

The following table describes important changes in each release of the ElastiCache for Memcached User Guide after March 2018. For notification about updates to this documentation, you can subscribe to the RSS feed.

Recent ElastiCache for Memcached Updates

Change Description Date
User Guide restructure

The single ElastiCache User Guide is now restructured so that there are separate user guides for Redis (ElastiCache for Redis User Guide) and for Memcached (ElastiCache for Memcached User Guide). The documentation structure in the AWS CLI Command Reference: elasticache section and the Amazon ElastiCache API Reference remain unchanged.

April 20, 2018

The following table describes the important changes to the ElastiCache for Memcached User Guide before June 2018.

Change Description Date Changed
Support for Asia Pacific (Osaka-Local).

ElastiCache added support for the Asia Pacific (Osaka-Local) region. The Asia Pacific (Osaka-Local) region currently supports a single availability zone and is by invitation only. For more information, see:

February 12, 2018
Support for EU (Paris).

ElastiCache added support for the EU (Paris) region. For more information, see:

December 18, 2017
Support for China (Ningxia) Region

Amazon ElastiCache added support for China (Ningxia) Region. For more information, see:

December 11, 2017
Support for Service Linked Roles

This release of ElastiCache added support for Service Linked Roles (SLR). For more information, see:

December 7, 2017
Support for R4 node types

This release of ElastiCache added support R4 node types in all regions supported by ElastiCache. You can purchase R4 node types as On-Demand or as Reserved Cache Nodes. For more information, see:

November 20, 2017
Connection patterns topic

ElastiCache documentation adds a topic covering various patterns for accessing an ElastiCache cluster in an Amazon VPC.

For more information, see Access Patterns for Accessing an ElastiCache Cluster in an Amazon VPC in the ElastiCache User Guide.

April 24, 2017
Support for Memcached 1.4.34

ElastiCache adds support Memcached version 1.4.34, which incorporates a number of fixes to earlier Memcached versions.

For more information, see Memcached 1.4.34 Release Notes at Memcached on GitHub.

April 10, 2017
Support for Memcached 1.4.33

ElastiCache adds support for Memcached version 1.4.33. For more information, see:

December 20, 2016
Support for EU West (London) Region

ElastiCache adds support for EU (London) Region. Only node types T2 and M4 are currently supported. For more information, see:

December 13, 2016

Support for Canada (Montreal) Region

ElastiCache adds support for the Canada (Montreal) Region. Only node type M4 and T2 are currently supported in this region. For more information, see:

December 8, 2016
Support for M4 and R3 node types

ElastiCache adds support for R3 and M4 node types in South America (São Paulo) Region and M4 node types in China (Beijing) Region. For more information, see:

November 1, 2016
US East 2 (Ohio) Region support

ElastiCache adds support for the US East (Ohio) Region (us-east-2) with M4, T2, and R3 node types. For more information, see:

October 17, 2016
M4 node type support

ElastiCache adds support for the M4 family of node types in most regions supported by ElastiCache. You can purchase M4 node types as On-Demand or as Reserved Cache Nodes. For more information, see:

August 3, 2016
Mumbai Region support

ElastiCache adds support for the Asia Pacific (Mumbai) Region. For more information, see:

June 27, 2016
Support for R3 node types

ElastiCache adds support for R3 node types in the China (Beijing) Region and South America (São Paulo) Region. For more information, see Supported Node Types.

March 16, 2016
Accessing ElastiCache using a Lambda function

Added a tutorial on configuring a Lambda function to access ElastiCache in an Amazon VPC. For more information, see ElastiCache Tutorials.

February 12, 2016
Support for Asia Pacific (Seoul) Region

ElastiCache adds support for the Asia Pacific (Seoul) (ap-northeast-2) Region with t2, m3, and r3 node types.

January 6, 2016

Support for Memcached 1.4.28.

ElastiCache adds support for Memcached version 1.4.24 and Memcached improvements since version 1.4.14. This release adds support for least recently used (LRU) cache management as a background task, choice of jenkins or murmur3 as your hashing algorithm, new commands, and miscellaneous bug fixes. For more information, see:

August 27, 2015

Support for Memcached Auto Discovery using PHP 5.6 This release of Amazon ElastiCache adds support for Memcached Auto Discovery client for PHP version 5.6. For more information, see Compiling the Source Code for the ElastiCache Cluster Client for PHP.

July 29, 2015

New topic: Accessing ElastiCache from outside AWS

Added new topic on how to access ElastiCache resources from outside AWS. For more information , see Accessing ElastiCache Resources from Outside AWS.

July 9, 2015

Node replacement messages added

ElastiCache adds three messages pertaining to scheduled node replacement. ElastiCache:NodeReplacementScheduled, ElastiCache:NodeReplacementRescheduled, and ElastiCache:NodeReplacementCanceled.

For more information and actions you can take when a node is scheduled for replacement, see ElastiCache's Event Notifications and Amazon SNS.

June 11, 2015

Support for cost allocation tags

ElastiCache adds support for cost allocation tags. For more information, see Monitoring Costs with Cost Allocation Tags.

February 9, 2015

Support for AWS GovCloud (US) Region

ElastiCache adds support for the AWS GovCloud (US) (us-gov-west-1) Region.

January 29, 2015

Support for EU (Frankfurt) Region

ElastiCache adds support for the EU (Frankfurt) (eu-central-1) Region.

January 19, 2015

AWS CloudTrail logging of API calls supported

ElastiCache adds support for using AWS CloudTrail to log all ElastiCache API calls. For more information, see Logging Amazon ElastiCache API Calls Using AWS CloudTrail.

September 15, 2014

New instance sizes supported

ElastiCache adds support for additional General Purpose (T2) instances. For more information, see Configuring Engine Parameters Using Parameter Groups.

September 11, 2014

Flexible node placement supported for Memcached

ElastiCache adds support for creating Memcached nodes across multiple Availability Zones. For more information, see Step 1: Launch a Memcached Cluster.

July 23, 2014

New instance sizes supported

ElastiCache adds support for additional General Purpose (M3) instances and Memory Optimized (R3) instances. For more information, see Configuring Engine Parameters Using Parameter Groups.

July 1, 2014

PHP auto discovery

Added support for PHP version 5.5 auto discovery. For more information, see Installing the ElastiCache Cluster Client for PHP.

May 13, 2014

Support for default Amazon Virtual Private Cloud (VPC)

In this release, ElastiCache is fully integrated with Amazon Virtual Private Cloud (VPC). For new customers, cache clusters are created in an Amazon VPC by default. For more information, see Amazon VPCs and ElastiCache Security.

January 8, 2013

PHP support for cache node auto discovery

The initial release of cache node auto discovery provided support for Java programs. In this release, ElastiCache brings cache node auto discovery support to PHP.

January 2, 2013

Support for Amazon Virtual Private Cloud (VPC)

In this release, ElastiCache clusters can be launched in Amazon Virtual Private Cloud (VPC). By default, new customers' cache clusters are created in an Amazon VPC automatically; existing customers can migrate to Amazon VPC at their own pace. For more information, see Amazon VPCs and ElastiCache Security.

December 20, 2012

Cache node auto discovery and new cache engine version

ElastiCache provides cache node auto discovery—the ability for client programs to automatically determine all of the cache nodes in a cluster, and to initiate and maintain connections to all of these nodes.

This release also offers a new cache engine version: Memcached version 1.4.14. This new cache engine provides enhanced slab rebalancing capability, significant performance and scalability improvements, and several bug fixes. There are several new cache parameters that can be configured. For more information, see Configuring Engine Parameters Using Parameter Groups.

November 28, 2012

New cache node types

This release provides four additional cache node types.

November 13, 2012

Reserved cache nodes

This release adds support for reserved cache nodes.

April 5, 2012

New guide

This is the first release of Amazon ElastiCache User Guide.

August 22, 2011