Could it be that you have multiple worker versions and previous version is still writing to the name

Could it be that you have multiple worker versions and previous version is still writing to the namespace? We would need namespace id to investigate, can you reply to direct message?

IIgor Could it be that you have multiple worker versions and previous version is still...

reor•1/12/25, 5:07 AM

Just replied through DM. Please have a look. Thanks!

Prince Gupta•1/13/25, 10:22 AM

Hello guys, I am new to cloudflare stack,

i am using workers KV, and yeah it works great but after sometime it stops handling requests and starts giving 400 why ??

I am doing

wrangler dev --remote

wrangler dev --remote

PPrince Gupta Hello guys, I am new to cloudflare stack, i am using workers KV, and yeah it wo...

IgorOP•1/13/25, 10:26 AM

You could be hitting free tier limits: https://developers.cloudflare.com/kv/platform/limits/

Cloudflare Docs

Limits · Cloudflare Workers KV

Prince Gupta•1/13/25, 10:26 AM

when i restart the server it works fine @Igor

Prince Gupta•1/13/25, 10:29 AM

IgorOP•1/13/25, 12:51 PM

Can you try to add more logging to capture more details? It might be something other than KV.

IgorOP•1/13/25, 12:53 PM

Specifying

--log-level debug

--log-level debug

might help

besimking•1/13/25, 6:58 PM

Greetings. Is KV different from Redis? I mean is it just a fancy cloudflare naming or is it a different product?

Bbesimking Greetings. Is KV different from Redis? I mean is it just a fancy cloudflare nami...

Isaac McFadyen•1/13/25, 6:59 PM

Different product.

Isaac McFadyen•1/13/25, 6:59 PM

KV is Cloudflare's own product and so has it's own API methods/infrastructure/backend.

Isaac McFadyen•1/13/25, 6:59 PM

The exact backend powering KV isn't public though.

besimking•1/13/25, 6:59 PM

It is not opensource I guess?

Isaac McFadyen•1/13/25, 6:59 PM

No.

besimking•1/13/25, 7:00 PM

Thanks a lot @Isaac McFadyen

BruceX•1/16/25, 2:59 PM

hey everyone, is KV durable? can I rest assured stored content will persist indefinitely?

BBruceX hey everyone, is KV durable? can I rest assured stored content will persist inde...

Hello, I’m Allie!•1/16/25, 4:26 PM

Assuming that you don’t overwrite it, yes

Chaika•1/16/25, 4:29 PM

Also assuming that you pay the bill every month lol, but yes, durable

BruceX•1/16/25, 4:30 PM

thanks

戴

戴きますReina•1/17/25, 1:05 PM

guys i have a hono project , when i tried to get a kv key but return null even though already binding, it work fine when in cli too, didn tknow why this happen

戴

戴きますReina•1/17/25, 1:20 PM

i with pumpkin guy can help me LOL

Original message was deleted

Idle•1/20/25, 10:15 AM

?pings

SuperHelpflare•1/20/25, 10:15 AM

Please do not ping community members for non-moderation reasons. Doing so will not solve your issue faster and will make people less likely to want to help you.

King Kazu•1/21/25, 6:15 PM

I really want to use kv, but the cold read latency is kinda killing me. For context, I am starting an API gateway service for API provides (similar to something like an API marketplace), and I use KV to store config details about the API and the end user. KV is god tier when I load test with tons of reqs / sec, but for more realistic scenarios of bursted requests at a smaller scale, I am getting P90 of ~300ms which is just not feasible. Would love to stay on Cloudflare services such as D1, but Upstash Redis seems like a good fix. Any thoughts?

KKing Kazu I really want to use kv, but the cold read latency is kinda killing me. For cont...

Elliot Hesp•1/21/25, 6:30 PM

How often does that data change? The ttl property on get requests may help.

EElliot Hesp How often does that data change? The ttl property on get requests may help.

King Kazu•1/21/25, 6:40 PM

Not often but only thing is data changes should be reflected quickly (e.x certain api key gets banned, don’t want to wait super long)

Original message was deleted

se•1/23/25, 10:39 AM

Hello, only based on object TTL; i.e. after you update a value, the safest is to purge after max TTL defined for your objects + some small buffer.

iLearn•1/23/25, 6:57 PM

Following is my Question and Answer(given by ChatGPT)
Please confirm / update the Answer given by ChatGPT. Thanks.

QUESTION :
In the following Cloudflare Worker Code to List by Prefix .. how will the billing happen ? .. billing only for the Keys which are read and correspond to prefix or billing for complete scan of the KV namespace ?

export default {
async fetch(request, env, ctx) {
const value = await env.NAMESPACE.list({ prefix: "user:1:" });
return new Response(value.keys);
},
};

ANSWER by CHATGPT :
In Cloudflare Workers, billing for KV operations depends on the specific API calls and the data retrieved. Here's how the billing works for your provided code:

KV List API Billing

The
```
KV.list()
```
```
KV.list()
```
operation is billed based on the number of keys returned that match the
```
prefix
```
```
prefix
```
filter, not the total number of keys in the namespace.
The filtering by
```
prefix
```
```
prefix
```
is handled internally by Cloudflare, so the operation scans only the relevant part of the namespace that matches the specified
```
prefix
```
```
prefix
```
.

### 2. Breakdown of Costs

List Operation: Each call to
```
list()
```
```
list()
```
counts as a single read operation, regardless of the number of keys returned.
Key Retrieval: You are billed for each key returned in the
value.keys
value.keys
array. If the
```
list()
```
```
list()
```
operation retrieves 10 keys, it will count as 10 read operations.

### 3. Example Billing Scenario

Assume

NAMESPACE.list({ prefix: "user:1:" })

NAMESPACE.list({ prefix: "user:1:" })

returns 50 keys.

You are billed for:
- 1 list operation (base cost for calling the
```
list()
```
```
list()
```
  method).
- 50 read operations (one for each key returned in the result).

### 4. What Is NOT Charged

You are not billed for scanning or evaluating keys that do not match the
```
prefix
```
```
prefix
```
. The filtering happens on Cloudflare's side, and only matching keys are returned and billed.

This means you are billed based on the keys matching your prefix and retrieved by the

list()

list()

operation, not for scanning the entire namespace.

Mathis @ blaxel.ai•1/23/25, 10:12 PM

Hello, does the expiration set at the key creation persists if I put on the key without specifying expiration?

Mathis @ blaxel.ai•1/23/25, 10:14 PM

E.g in this code:

await env.NAMESPACE.put(key, value, {
  expiration: secondsSinceEpoch,
});

await env.NAMESPACE.put(key, value);

await env.NAMESPACE.put(key, value, {
  expiration: secondsSinceEpoch,
});

await env.NAMESPACE.put(key, value);

MMathis @ blaxel.ai Hello, does the expiration set at the key creation persists if I put on the key ...

se•1/24/25, 2:42 PM

No, it does not inherit the expiration settings of the previous overwritten object.

�

😈 Donkey 💫•1/28/25, 1:00 PM

Requests from around the world, pretty higher than expected

iLearn•1/28/25, 10:25 PM

QQ : Can "Storage" for "Workers KV per Namespace" store 200GB of data ? .. Limits section says "Unlimited", but still want this to be confirmed .

thomasgauvin•1/31/25, 3:56 PM

Hey folks. We're designing a new feature for Workers KV to make it easier to retrieve multiple kv pairs at once. I'd love to get some feedback on some early designs. If you're up for it, snag 15 minutes on my calendar and I'll share with you some of the things we're thinking (or DM me) https://calendar.app.google/ABB6TtNyg7jPg82j8

Appointments

Tthomasgauvin Hey folks. We're designing a new feature for Workers KV to make it easier to ret...

森

森@VerseLink (RW)•1/31/25, 5:44 PM

Scheduled! First time doing this, would it be on discord?

jd•2/3/25, 7:40 PM

hi qq -- im trying to convert a largely kv-based lookup metadata of ~7GB in size of json and gets 10+ GB in size later with parallel reads, updates. Metadata needs persistence storage for consistency and availability too.

My metadata has 10M+ entries where each entry is a small dict of mostly nested strings of a loose schema, mixed with floats.

Is this size a good use case for cloudflare kv? thanks!

alotabits•2/4/25, 2:35 PM

Sorry for the cross-post. I asked this in workers before I knew about this channel.

Are values written to KV automatically compressed for storage?

iLearn•2/4/25, 9:25 PM

how much is "expirationTtl (option in Workers-KV)" reliable ? .. i mean, if ttl is set for 10-minutes, can i expect the key to deleted after 10-minutes ? or what error margin need to be taken in consideration ?

RRob We will not serve an object after expiration/expirationTtl has passed. This is a...

iLearn•2/5/25, 4:57 PM

Brilliant. Thanks for confirmation.

RRob We will not serve an object after expiration/expirationTtl has passed. This is a...

iLearn•2/5/25, 5:00 PM

QQ : if i use get(my_key) after expiration/expirationTTL .. i shall be getting "null" / "undefined" as returned value ?

IiLearn QQ : if i use get(my_key) after expiration/expirationTTL .. i shall be getting "...

1984 Ford Laser•2/6/25, 4:21 AM

It will be

null

null

cosbgn•2/7/25, 2:58 PM

What's the difference between expirationTtl vs cachettl ?

cosbgn•2/7/25, 2:59 PM

If I use for example:

expirationTtl: 21600

expirationTtl: 21600

do I also need to use cacheTtl?

cosbgn•2/7/25, 2:59 PM

or it will be cached by default?

Ccosbgn What's the difference between expirationTtl vs cachettl ?

Chaika•2/7/25, 3:09 PM

expirationTtl: after this time, the key (and thus its value) will be gone forever
cacheTtl: Cache it x long, to reduce cold requests to KV's Central Stores, but of course also impacts how quickly you'll see updates if you do delete/update it

Ccosbgn or it will be cached by default?

Chaika•2/7/25, 3:09 PM

cacheTtl is 60 seconds minimum. If you don't set it, it'll be 60s.

cosbgn•2/7/25, 3:14 PM

If I have a key which won't change till I manually delete it, I normally use expirationTtl: 21600expirationTtl: 21600 so I know that even if something goes wrong it will expire in 6 hours.

I guess it would help a lot to also add cacheTtl: 21600, right?

cache will be delete when I delete the key manually?

cosbgn•2/7/25, 3:19 PM

For example I do:

const [key, value] = ["something", "whatever"]

binding.put(key, value, { expirationTtl: 21600 })

Then after 5 minutes I do: 

binding.get(key, {cacheTtl:21600})

Then after 5 minutes I do:

binding.delete(key)

Then after 5 minutes I do:

binding.get(key, {cacheTtl:21600}) 
Will this last one return null or the cached value?

const [key, value] = ["something", "whatever"]

binding.put(key, value, { expirationTtl: 21600 })

Then after 5 minutes I do: 

binding.get(key, {cacheTtl:21600})

Then after 5 minutes I do:

binding.delete(key)

Then after 5 minutes I do:

binding.get(key, {cacheTtl:21600}) 
Will this last one return null or the cached value?

pandalambda2•2/9/25, 12:31 AM

it isn't clear to me, that if cacheTtl is absent what happens - is the default min of 60 seconds applied, or is it no cache what so ever?

const [key, value] = ["something", "whatever"] binding.put(key, value, { expirationTtl: 21600 }) Then after 5 minutes I do: binding.get(key, {cacheTtl:21600}) Then after 5 minutes I do: binding.delete(key) Then after 5 minutes I do: binding.get(key, {cacheTtl:21600}) Will this last one return null or the cached value?

Could it be that you have multiple worker versions and previous version is still writing to the name

KV List API Billing

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KV List API Billing