How to Implement Azure Cache with Replicas for Data Integrity

Barak Pahima 60

I am seeking a solution for Azure Cache that ensures data integrity. I have noticed that Azure Cache Enterprise offers strong eventual consistency; however, this is insufficient for my needs.

The scenario involves using two Azure caches where all clients would read and write from one node (the primary), while the secondary remains continuously synced. Although Azure Cache Premium tier appears to be one option, it seems that automatic failover to the secondary node is not supported when the primary node goes down. Is there a version of Azure Cache that provides automatic switching to the secondary in case of primary node failure?

Thank you,

Barak.

Mahesh Kurva 1,470 Reputation points Microsoft Vendor

2024-10-07T13:03:55.04+00:00

Hi @Barak Pahima,

Welcome to the Microsoft Q&A and thank you for posting your questions here.

Based on the information you provided, it seems like you are looking for a version of Azure Cache that provides automatic switching to the secondary node in case of primary node failure.

Azure Cache for Redis Premium and Enterprise tiers provide built-in redundancy by hosting each cache on two dedicated virtual machines (VMs). In the event of a primary node failure, the secondary node can be promoted to primary, but this process is not automatic. You would need to manually initiate the failover process.

However, Azure Cache for Redis also supports zone redundancy in its Premium and Enterprise tiers. A zone-redundant cache runs on VMs spread across multiple Availability Zones. It provides higher resilience and availability. When a zone goes down, cache nodes in other zones are available to keep the cache functioning as usual.

To set up zone redundancy for your Premium and Enterprise tier Azure Cache for Redis instances, you can follow the steps outlined in this article: https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-how-to-zone-redundancy.

For more information, please refer the document: https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-high-availability.

I hope this information helps. Please do let us know if you have any further queries.
Mahesh Kurva 1,470 Reputation points Microsoft Vendor

2024-10-08T13:11:42.51+00:00

Hi @Barak Pahima,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Mahesh Kurva 1,470 Reputation points Microsoft Vendor

2024-10-09T14:28:08.85+00:00

Hi @Barak Pahima,Just following up to see if you’ve had a chance to look into it further.In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

1 answer

Oury Ba-MSFT 19,826 Reputation points Microsoft Employee

2024-10-18T22:39:25.97+00:00

@Barak Pahima Thank you for reaching out.

The Standard, Premium and Enterprise tiers of Azure Cache for Redis all provide data replication with eventual consistency and automatic failover in case of primary node failures. These tiers have replication and high availability by default and no customer action is needed in case of primary node failure.

Are you referring to to replication/redundancy within a single cache or across multiple caches (geo replication)? Failover of primary nodes within a single cache is always automatic. However, failover between different caches in a geo replicated set of caches is not automatic.

Regards,

Oury
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Mahesh Kurva 1,470 Reputation points Microsoft Vendor

2024-10-21T10:07:11.8633333+00:00

Hi @Barak Pahima,

Just checking in to see if the above answer provided by @Oury Ba-MSFT helped.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.
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How to Implement Azure Cache with Replicas for Data Integrity

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