What's New in Azure Cache for Redis

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August 2024

Availability zones

For the Standard and Premium tiers, you can now use availability zones (Preview) with the ability to select zones automatically. With the Standard and Premium, you can choose to have the zones chosen automatically by Azure. With Premium, you can continue to choose your availability zones explicitly.

June 2024

.NET Output cache and HybridCache

Using Azure Cache for Reds as output cache was introduced in .NET 8 in November 2023. Output Caching saves rendered web pages to improve performance, resilience, and reduce cost through server resource utilization. You can use Redis as a built-in output cache store in .NET 8. For more information on using Redis as an output cache, see Output caching middleware in ASP.NET Core

ASP.NET Core's support for distributed caching is broadening .NET 9 Preview 4 for .NET 9 a new HybridCache API. HybridCache augments the existing IDistributedCache support in ASP.NET Core with new capabilities, including multi-tier storage, with a limited in-process L1 cache supplemented by a separate (usually larger) out-of-process L2 cache. The hybrid approach to cache storage provides you with two advantages: most fetches are served efficiently from L1, but cold-start and data you access infrequently use L2. Using L2 for data you access less frequently doesn't over-utilize the underlying backend.

For more information and downloading, see .NET 9 Preview 4

HybridCache also includes:

  • stampede protection to prevent parallel fetches of the same data
  • configurable serialization
  • simplifying the API usage for common scenarios

For more information, see the HybridCache library.

Connection Auditing

Connection auditing is GA for all SKUs, and you can configure an Azure Policy to audit or enforce specific policies about private endpoints and public network access with your caches. Azure Cache for Redis doesn't provide a built-in policy, but you can author a custom policy to enforce that private endpoints are enabled.

For more information, see Manage network policies for private endpoints.

May 2024

Azure Functions

Using Azure Cache for Redis with Azure Functions to create optimized serverless and event-driven architectures is now in General Availability (GA).

For more information, see Overview of Azure functions for Azure Cache for Redis.

Microsoft Entra ID

Support Microsoft Entra ID for authentication and role-based access control across regions that support Azure Cache for Redis is now in General Availability (GA).

For more information, see Use Microsoft Entra ID for cache authentication.

April 2024

Support for a built-in flush operation that can be started at the control plane level for caches in the Basic, Standard, and Premium tier is now in General Availability (GA).

For more information, see flush data operation.

January 2024

All tiers of Azure Cache for Redis now support TLS 1.3.

For more information, see What are the configuration settings for the TLS protocol?.

October 2023

Flush data operation for Basic, Standard, and Premium Caches (preview)

Basic, Standard, and Premium tier caches now support a built-in flush operation that can be started at the control plane level. Use the flush operation with your cache executing the FLUSH ALL command through Portal Console or redis-cli.

For more information, see flush data operation.

Update channel for Basic, Standard, and Premium Caches (preview)

With Basic, Standard or Premium tier caches, you can choose to receive early updates by configuring the "Preview" or the "Stable" update channel.

For more information, see update channels.

September 2023

Remove TLS 1.0 and 1.1 from use with Azure Cache for Redis

To meet the industry-wide push toward the exclusive use of Transport Layer Security (TLS) version 1.2 or later, Azure Cache for Redis is moving toward requiring the use of TLS 1.2 in October 2024.

As a part of this effort, you can expect the following changes to Azure Cache for Redis:

  • Phase 1: Azure Cache for Redis stops offering TLS 1.0/1.1 as an option for MinimumTLSVersion setting for new cache creates. Existing cache instances won't be updated at this point. You can still use the Azure portal or other management APIs to change the minimum TLS version to 1.0 or 1.1 for backward compatibility.
  • Phase 2: Azure Cache for Redis stops supporting TLS 1.1 and TLS 1.0 starting October 1, 2024. After this change, your application must use TLS 1.2 or later to communicate with your cache. The Azure Cache for Redis service is expected to be available while we update the MinimumTLSVerion for all caches to 1.2.

For more information, see Remove TLS 1.0 and 1.1 from use with Azure Cache for Redis.

June 2023

Microsoft Entra ID for authentication and role-based access control is available across regions that support Azure Cache for Redis.

May 2023

Microsoft Entra ID authentication and authorization (preview)

Microsoft Entra ID based authentication and authorization is now available for public preview with Azure Cache for Redis. With this Microsoft Entra ID integration, users can connect to their cache instance without an access key and use role-based access control to connect to their cache instance.

This feature is available for Azure Cache for Redis Basic, Standard, and Premium SKUs. With this update, customers can look forward to increased security and a simplified authentication process when using Azure Cache for Redis.

Support for up to 30 shards for clustered Azure Cache for Redis instances

Azure Cache for Redis now supports clustered caches with up to 30 shards. Now, your applications can store more data and scale better with your workloads.

April 2023

99th percentile latency metric (preview)

A new metric is available to track the worst-case latency of server-side commands in Azure Cache for Redis instances. Latency is measured by using PING commands and tracking response times. This metric can be used to track the health of your cache instance and to see if long-running commands are compromising latency performance.

For more information, see Monitor Azure Cache for Redis.

November 2022

Redis 6 becomes default update

All versions of Azure Cache for Redis REST API, PowerShell, Azure CLI, and Azure SDK, create Redis instances using Redis 6 starting January 20, 2023. Previously, we announced this change would take place on November 1, 2022, but due to unforeseen changes, the date has now been pushed out to January 20, 2023.

For more information, see Redis 6 becomes default for new cache instances.

October 2022

Enhancements for passive geo-replication

Several enhancements were made to the passive geo-replication functionality offered on the Premium tier of Azure Cache for Redis.

  • New metrics are available for customers to better track the health and status of their geo-replication link, including statistics around the amount of data that is waiting to be replicated. For more information, see Monitor Azure Cache for Redis.

    • Geo Replication Connectivity Lag (preview)
    • Geo Replication Data Sync Offset (preview)
    • Geo Replication Full Sync Event Finished (preview)
    • Geo Replication Full Sync Event Started (preview)

  • Customers can now initiate a failover between geo-primary and geo-replica caches with a single selection or CLI command, eliminating the hassle of manually unlinking and relinking caches. For more information, see Initiate a failover from geo-primary to geo-secondary.

  • A global cache URL is also now offered that automatically updates their DNS records after geo-failovers are triggered, allowing their application to manage only one cache address. For more information, see Geo-primary URL.

September 2022

Upgrade your Azure Cache for Redis instances to use Redis version 6 by June 30, 2023

On June 30, 2023, we'll retire version 4 for Azure Cache for Redis instances. Before that date, you need to upgrade any of your cache instances to version 6.

  • All cache instances running Redis version 4 after June 30, 2023 will be upgraded automatically.
  • All cache instances running Redis version 4 that have geo-replication enabled will be upgraded automatically after August 30, 2023.

We recommend that you upgrade your caches on your own to accommodate your schedule and the needs of your users to make the upgrade as convenient as possible.

For more information, see Retirements.

Support for managed identity in Azure Cache for Redis

Authenticating storage account connections using managed identity reached General Availability (GA).

For more information, see Managed identity for storage.

July 2022

Redis 6 becomes default for new cache instances

Important

Previously, we announced this change would take place on November 1, 2022. The new date is January 20th, 2023. The text has been updated to reflect the new date.

Beginning January 20, 2023, all versions of Azure Cache for Redis REST API, PowerShell, Azure CLI, and Azure SDK will create Redis instances using the latest stable version of Redis offered by Azure Cache for Redis by default. Previously, Redis version 4.0 was the default version used. However, as of October 2021, the latest stable Redis version offered in Azure Cache for Redis is 6.0.

Note

This change does not affect any existing instances. It is only applicable to new instances created from January 20, 2023, and onward.

The default Redis version that is used when creating a cache instance can vary because it is based on the latest stable version offered in Azure Cache for Redis.

If you need a specific version of Redis for your application, we recommend using latest artifact versions as shown in the table. Then, choose the Redis version explicitly when you create the cache.

Artifact Version that supports specifying Redis version
REST API 2020-06-01 and newer
PowerShell 6.3.0 and newer
Azure CLI 2.27.0 and newer
Azure SDK for .NET 7.0.0 and newer
Azure SDK for Python 13.0.0 and newer
Azure SDK for Java 2.2.0 and newer
Azure SDK for JavaScript 6.0.0 and newer
Azure SDK for Go v49.1.0 and newer

April 2022

New metrics for connection creation rate

These two new metrics can help identify whether Azure Cache for Redis clients are frequently disconnecting and reconnecting, which can cause higher CPU usage and Redis Server Load.

  • Connections Created Per Second
  • Connections Closed Per Second

For more information, see View cache metrics.

Default cache change

On May 15, 2022, all new Azure Cache for Redis instances will use Redis 6 by default. You can still create a Redis 4 instance by explicitly selecting the version when you create an Azure Cache for Redis instance.

This change doesn't affect any existing instances. The change is only applicable to new instances created after May 15, 2022.

The default version of Redis used when creating a cache can change over time. Azure Cache for Redis might adopt a new version when a new version of open-source Redis is released. If you need a specific version of Redis for your application, we recommend choosing the Redis version explicitly when you create the cache.

February 2022

TLS Certificate Change

As of May 2022, Azure Cache for Redis rolls over to TLS certificates issued by DigiCert Global G2 CA Root. The current Baltimore CyberTrust Root expires in May 2025, requiring this change.

We expect that most Azure Cache for Redis customers aren't affected. However, your application might be affected if you explicitly specify a list of acceptable certificate authorities (CAs), known as certificate pinning.

For more information, read this blog that contains instructions on how to check whether your client application is affected. We recommend taking the actions recommended in the blog to avoid cache connectivity loss.

January 2022

Support for managed identity in Azure Cache for Redis in storage

Azure Cache for Redis now supports authenticating storage account connections using managed identity. Identity is established through Microsoft Entra ID, and both system-assigned and user-assigned identities are supported. Support for managed identity further allows the service to establish trusted access to storage for uses including data persistence and importing/exporting cache data.

For more information, see Managed identity with Azure Cache for Redis.

October 2021

Azure Cache for Redis 6.0 GA

Azure Cache for Redis 6.0 is now generally available. The new version includes:

  • Redis Streams, a new data type
  • Performance enhancements
  • Enhanced developer productivity
  • Boosts security

You can now use an append-only data structure, Redis Streams, to ingest, manage, and make sense of data that is continuously being generated.

Additionally, Azure Cache for Redis 6.0 introduces new commands: STRALGO, ZPOPMIN, ZPOPMAX, and HELP for performance and ease of use.

Get started with Azure Cache for Redis 6.0, today, and select Redis 6.0 during cache creation. Also, you can upgrade your existing Redis 4.0 cache instances.

Diagnostics for connected clients

Azure Cache for Redis now integrates with Azure diagnostic settings to log information on all client connections to your cache. Logging and then analyzing this diagnostic setting helps you understand who is connecting to your caches and the timestamp of those connections. This data could be used to identify the scope of a security breach and for security auditing purposes. Users can route these logs to a destination of their choice, such as a storage account or Event Hubs.

For more information, see Monitor Azure Cache for Redis data using diagnostic settings.

October 2020

Azure TLS Certificate Change

Microsoft is updating Azure services to use TLS certificates from a different set of Root Certificate Authorities (CAs). This change is being made because the current CA certificates don't comply with one of the CA/Browser Forum Baseline requirements. For full details, see Azure TLS Certificate Changes.

For more information on the effect to Azure Cache for Redis, see Azure TLS Certificate Change.

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