Cloudflare Workers KV is a global key-value data store with low latency.

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Let’s take a look at how our Support team explained the Cloudflare Workers KV in detail.

Cloudflare Workers KV

Workers KV centrally stores data and uses pull-based replication to cache data; it is generally suitable for use cases where we need to write infrequently but read quickly and frequently. It can optimize these high-read applications, reaching peak performance only when data is read frequently. Infrequently read values are kept centrally, while more popular values are kept in all Cloudflare data centres around the world.

Overview of Cloudflare Workers

Cloudflare worker is essentially a service for function deployment. They provide a serverless execution environment that we can use to quickly develop and deploy small and modular cloud functions.

Starting with workers is very simple. Firstly, let’s install wrangler, a project management tool for Cloudfare Worker.

npm i @cloudflare/wrangler -g

Wrangler handles all of the mundane tasks for us, such as project generation from templates, build, configuration, and publishing, among other things. A worker is of two parts: an event listener that calls the worker and an event handler that returns a response object. Adding an event listener to a button is all it takes to create a worker.

We can use wrangler to create and preview our worker in real time.

Firstly, use wrangler build to build the worker.

Then use wrangler preview to see a live preview of something in the browser.

The preview is only for testing purposes. We must publish the workers if we want to trigger them by our own domain or a subdomain. Wrangler and our project both require very little configuration for publishing, so it’s fairly simple.

Wrangler Configuration

Simply create a Cloudflare account and obtain an API key. To set up wrangler, simply follow these steps:

wrangler config

Then, it will ask for the registered email address and API key, and then we will be ready to go. Simply enter our account ID in the wrangler.toml and hit wrangler publish to publish the worker on a workers.dev subdomain. Then, it will deploy the worker and  will be  live at a newly created subdomain called workers.dev.

Regarding Routes

The script or project associated with script-name will be invoked when we publish on a {script-name}.{subdomain}.workers.dev domain. It is not possible to run a script solely from {subdomain}.workers.dev.

Worker KV

Workers by themselves cannot be used to create anything complex without persistent storage, which is where Workers KV comes in. Workers KV, as the name suggests, is a low-latency, high-volume key-value store optimised for reads. It reduces read latency by dynamically spreading frequently read entries to the edges and storing less frequently read entries in the centre. Newly added keys are immediately reflected in all regions, whereas changing the value of the keys can take up to 60 seconds to propagate, depending on the region.

Architecture

Instead of using a container-based underlying architecture, Cloudflare Workers ‘Isolates’. ‘Isolates’ is the technology that allows V8 (Google Chrome’s JavaScript Engine) to efficiently and securely run thousands of processes on a single server. This translates to faster code execution and less memory consumption.

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Conclusion

To sum up, our Support team thoroughly explained the Cloudflare Workers KV.