What's faster... KV or DO? - Cloudflare Developers

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kian

K

kian•4/13/24, 12:08 PM

Usually KV, but it depends.

kian

K

kian•4/13/24, 12:09 PM

Are you creating the DO in Region A and accessing it in Region A? DO will probably be faster

kian

K

kian•4/13/24, 12:09 PM

Accessing it globally? KV will be faster due to local caching + central stores in 2 regions

bun

B

bun•4/13/24, 1:02 PM

kv is very expensive

bun

B

bun•4/13/24, 1:02 PM

for no reason

juanferreras

J

juanferreras•4/16/24, 10:15 PM

is using KV metadata simply incompatible with the dashboard? I'm tempted to use metadata for list()list() calls to be self-sufficient, but I worry we'll create a new entry or update an existing one using the Cloudflare Dashboard and we'll have metadata !== value

(or, are there any easy ways to view/edit metadata within the dashboard?)

James

J

James•4/16/24, 11:09 PM

There's no way to view/edit KV metadata within the dashboard today, nope. I'm not entirely sure honestly what happens if you edit a key's value in the dashboard that already has metadata - that's probably worth testing.

BrianJM

BBrianJM What's faster... KV or DO?

Unsmart

U

Unsmart•4/16/24, 11:27 PM

I'm a bit late to the party but I would personally recommend you always use DO over KV personally. Especially when you can create a DO per user as DOs are faster than KV when close to the user. Only time I use KV is when I am too lazy to bring up a wrangler project and just make a small worker via dash lol.

Unsmart

U

Unsmart•4/16/24, 11:28 PM

Only time KV is really more useful than DOs are when you have larger values but then I would just recommend R2

森@VerseLink (RW)

森

森@VerseLink (RW)•4/17/24, 2:48 AM

would you say DO or KV would be better for reference tokens? (so that we can check up to see if a token is valid or not)

W7T2A

W

W7T2A•4/17/24, 12:49 PM

Is there any option for exporting all data as a backup / or a builtin backup functionality for a kv store? Or is the only way to do this by creating a script via API (for now)

Original message was deleted

Chaika

C

Chaika•4/18/24, 5:29 PM

you can get storage by namespace analytics via api: https://developers.cloudflare.com/api/operations/workers-kv-stored-data-analytics-query-stored-data-analytics

Cloudflare API Documentation

Interact with Cloudflare's products and services via the Cloudflare API

Chaika

C

Chaika•4/18/24, 5:30 PM

can't do requests by namespace though

sdan

S

sdan•4/19/24, 3:12 AM

anyone know if its possible to use KV within a nextjs app or would i need to make a worker to interface with KV and expose an api from that worker. wondering if the Binding works for nextjs

Rubi

R

Rubi•4/19/24, 3:37 AM

should I use KV or Durable Object for a quick session check?

Rubi

R

Rubi•4/19/24, 5:57 AM

let me stay on D1

Rubi

RRubi should I use KV or Durable Object for a quick session check?

bun

B

bun•4/19/24, 9:39 AM

DO's are cheaper and faster (for a single region)

bun

Bbun DO's are cheaper and faster (for a single region)

bun

B

bun•4/19/24, 9:39 AM

but ye, D1 is fine, i have it on d1 as well

bun

Bbun DO's are cheaper and faster (for a single region)

Rubi

R

Rubi•4/19/24, 9:54 AM

do ia faster than KV?

Rubi

RRubi do ia faster than KV?

Hello, I’m Allie!

H

Hello, I’m Allie!•4/19/24, 9:55 AM

If the DO is near you, then yes

Rubi

R

Rubi•4/19/24, 9:56 AM

alright, gonna using DO

Rubi

RRubi alright, gonna using DO

bun

B

bun•4/19/24, 10:12 AM

offtopic but your pfp goes insanely hard

mau

M

mau•4/20/24, 12:30 PM

I am implementing cache purging function but hitting a roadblock

for example

http://localhost:8787/api/addons?where[id][equals]=66221339a9cb9c462a245943 caches data from http://localhost:3000/api/addons?where[id][equals]=66221339a9cb9c462a245943

and i am using cloudflare kv for caching. I am generating the kv key using below hash function

export async function getHashString(input) {
  const encoder = new TextEncoder();
  const data = encoder.encode(input);
  const hashBuffer = await crypto.subtle.digest('SHA-256', data);
  return bufferToHex(hashBuffer);
}

function bufferToHex(buffer) {
  const view = new DataView(buffer);
  let hex = '';
  for (let i = 0; i < view.byteLength; i += 1) {
    const byte = view.getUint8(i).toString(16);
    hex += byte.padStart(2, '0');
  }
  return hex;
}

export async function getHashString(input) {
  const encoder = new TextEncoder();
  const data = encoder.encode(input);
  const hashBuffer = await crypto.subtle.digest('SHA-256', data);
  return bufferToHex(hashBuffer);
}

function bufferToHex(buffer) {
  const view = new DataView(buffer);
  let hex = '';
  for (let i = 0; i < view.byteLength; i += 1) {
    const byte = view.getUint8(i).toString(16);
    hex += byte.padStart(2, '0');
  }
  return hex;
}

Can someone suggest a method for clearing the cache in the scenario described? I know how to handle cache invalidation for individual items as it's straightforward, but I'm unsure how to effectively clear the cache for queries that involve collection filtering, such as those with multiple conditions. What strategies could work for this more complex case?

grimpa

Ggrimpa Is there an easy way to know how many values I have stored in KV (in the dashboa...

Matt Silverlock

M

Matt Silverlock•4/22/24, 5:11 PM

Not yet (in the dash) — we're working on a new metrics dash and more metrics for KV.

But you can query via API: https://developers.cloudflare.com/api/operations/workers-kv-stored-data-analytics-query-stored-data-analytics

    "max": {
      "storedBytes": 32,
      "storedKeys": 4
    },

    "max": {
      "storedBytes": 32,
      "storedKeys": 4
    },

Cloudflare API Documentation

Interact with Cloudflare's products and services via the Cloudflare API

Varna

V

Varna•4/25/24, 1:06 PM

any recommendations for auto generated keys for KV? I just want to store two weeks of reports in sequential order (few hundred records tops)

Varna

VVarna any recommendations for auto generated keys for KV? I just want to store two wee...

Hello, I’m Allie!

H

Hello, I’m Allie!•4/25/24, 1:09 PM

Date.now()?

Hello, I’m Allie!

HHello, I’m Allie!Date.now()?

Varna

V

Varna•4/25/24, 1:11 PM

thought about that too

but maybe it would be better to use smth like crypto.randomUUID()crypto.randomUUID(), or maybe I'm overthinking this

Varna

V

Varna•4/25/24, 3:13 PM

I wanted to test if expirationTtlexpirationTtl works by setting it's value to 70 (seconds).
It did set it to expiration: 1716649322expiration: 1716649322 on KV.list()KV.list() response which is 18:02 (8 minutes ago).
Is it purged at batches on some intervals, or do I need to do that manually?
Or is this normal if I had a long cacheTtlcacheTtl.

Varna

V

Varna•4/25/24, 4:40 PM

It started working :catjam:

Oom What is this? Curious 🤔 what are you doing

Rubi

R

Rubi•4/27/24, 3:00 PM

it's sveltekit middleware to check if a request to a path group is authorized or not

Oom Device id is just user agent?

Rubi

R

Rubi•4/27/24, 3:02 PM

a session id inside a header

Oom D1 with index would be cheaper then D0

Rubi

R

Rubi•4/27/24, 3:03 PM

I'm finding DO Alarm are harder to use inside sveltekit, I don't know how, it's need a class and something

Oom D1 with index would be cheaper then D0

Rubi

R

Rubi•4/27/24, 3:03 PM

I may gonna stick with KV for the session, and the DB... I just moved it to neon

Oom Do alarm for? Deleting expired session?

Rubi

R

Rubi•4/27/24, 3:05 PM

yes

Oom DO needs separate workers to be deployed, apart from pages not inside page

Rubi

R

Rubi•4/27/24, 3:06 PM

yeah, I really don't understand, why the way we use it can't be just like D1, or KV

Oom If stored in kv unless you do mapping with database you can't track the session ...

Rubi

R

Rubi•4/27/24, 3:11 PM

yes, they key are mapped with database

Oom Use D1 with workers cron

Rubi

R

Rubi•4/27/24, 3:12 PM

I think I'm gonna keeping things simple and traditional

export async function getHashString(input) {
  const encoder = new TextEncoder();
  const data = encoder.encode(input);
  const hashBuffer = await crypto.subtle.digest('SHA-256', data);
  return bufferToHex(hashBuffer);
}

function bufferToHex(buffer) {
  const view = new DataView(buffer);
  let hex = '';
  for (let i = 0; i < view.byteLength; i += 1) {
    const byte = view.getUint8(i).toString(16);
    hex += byte.padStart(2, '0');
  }
  return hex;
}

export async function getHashString(input) {
  const encoder = new TextEncoder();
  const data = encoder.encode(input);
  const hashBuffer = await crypto.subtle.digest('SHA-256', data);
  return bufferToHex(hashBuffer);
}

function bufferToHex(buffer) {
  const view = new DataView(buffer);
  let hex = '';
  for (let i = 0; i < view.byteLength; i += 1) {
    const byte = view.getUint8(i).toString(16);
    hex += byte.padStart(2, '0');
  }
  return hex;
}