Redis Performance Across Different Regions

Question

I have a redis db on an EC2 in the us west region while other regions, eu-central and ap-southeast connect to it. I am using Global Accelerator to reduce the latency but I was wondering, are there other ways to reduce the latency here? The instances in other regions need to read and write on the redis Db. I was looking at elastic cache using Global Datastore but it seems the secondary redis db will be a readonly option. I was thinking of using Redis Enterprise but wondered if there is a way using AWS first.

PS. I moved my redis db from another cloud provider to AWS and saw a massive performance increase because of the latency difference. Hoping to get another way to increase performance here.

Answer

Unfortunately, there's no beating the speed of light. As you've seen, using Global Accelerator can make a difference but it isn't going to reduce latency enough for some users - because they are just further away.

Adding a read-only replica in a region closer to the users is a good idea; but that does mean that writes have to go back to the read/write replica (assuming you want synchronous writes) or you could have some process in the region local to the users that accept asynchronous write requests. Either way means a change in your application architecture.

Answer

What instance size are you using? If you are using Instances which have more than 4 cores - this comes with a feature called Enhanced IO enabled by default - which improves throughput by upto 83% and upto 47% reduction in latency with no application code changes required.

Additional details can be found in this Blog -  https://aws.amazon.com/blogs/database/boosting-application-performance-and-reducing-costs-with-amazon-elasticache-for-redis/

There are a few other changes that can improve overall latencies but that could involve looking at the metrics.

Redis Performance Across Different Regions

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