Cloudflare Developers•3y ago

I will say though with KV only having 1 extra origin I do almost never see a reason to use KV instea

I will say though with KV only having 1 extra origin I do almost never see a reason to use KV instead of R2 + Cache API

If it had like 3 or 4 origins it might start to make more sense for truly latency critical things

UUnsmart I will say though with KV only having 1 extra origin I do almost never see a rea...

Santosh•12/6/23, 5:04 PM

Can you pl explain "1 extra origin" concept? Not sure I understand what you mean by 3/4 origins.

UUnsmart KV may be a better fit for configs than R2 given KV will have lower latency but ...

Santosh•12/6/23, 5:06 PM

It appears like KV latency is jumping all over even after Cache (theoretically KV within colo already uses cache ??) from the comments above ?Using plain vanilla Cache API -

UnsmartOP•12/6/23, 5:06 PM

KV stores data in 2 locations. One in the US, one in the EU.

R2 stores data in 1 location (location is selected at creation time).

So for reads that miss the cache KV can be slightly faster because it might have the data stored closer to the user. With only having 1 extra location the data is stored though the added benefit is pretty minimal IMO. But if KV stored data in like 3-4 regions across the world the latency boost for cache misses could be pretty noticeable.

UnsmartOP•12/6/23, 5:08 PM

Throwing the Cache API in front of KV will not really change the latency of KV given KV already caches data.

Santosh•12/6/23, 5:09 PM

What about using Cache alone without using KV api? WOuld that change the latency to access the data?

UnsmartOP•12/6/23, 5:10 PM

It would yes unless whatever source you are getting the data from already uses cloudflare cache in some way.

UnsmartOP•12/6/23, 5:11 PM

A cache will make things faster but if the data is already cached it cant make things faster than that.

SSantosh Interesting that you mentioned Cache API, what use cases would require to use KV...

SK•12/7/23, 2:23 AM

I don't have high enough RPS for KV to cache my data and the cold reads are pretty slow

SK•12/7/23, 2:23 AM

few people visit my website, and when they do it's slow lol

SK•12/7/23, 2:23 AM

https://upstash.com/blog/edgecaching-benchmark

SK•12/7/23, 2:24 AM

upstash benchmarked KV and they found the same thing. But I've had a much better time simply using the cache api on-top of KV

SK•12/7/23, 2:56 AM

ok I just ran a very quick benchmark

SK•12/7/23, 2:56 AM

https://test.blueradar.net/

SK•12/7/23, 2:57 AM

there are 2 routes, one fetches the data from KV, and the other tries the cache first and fallbacks to kv

SK•12/7/23, 2:57 AM

I ran a simple python script that hit each route 100 times and recorded the latencies to get some summary stats

SK•12/7/23, 2:57 AM

UUnsmart A cache will make things faster but if the data is already cached it cant make t...

SK•12/7/23, 2:57 AM

it turns out that it does actually make it faster

SK•12/7/23, 2:58 AM

sure not by a whole lot but but it does

SK•12/7/23, 2:58 AM

the last time I tested this KV was performing much worse (around 50-100ms) so I'm super happy that it's working heaps better now

UnsmartOP•12/7/23, 3:02 AM

I mean if you think it helps you can do it sure no one going to stop you

SK•12/7/23, 3:03 AM

but yeah, when I refactor this I'll switch to r2 + cache api instead of layering it on kv, that was just placeholder to get it working

SSK <https://test.blueradar.net/>

Vikash•12/9/23, 3:46 PM

Code of your test?

Are you using

kv.get(key, { cacheTtl: 60 })

kv.get(key, { cacheTtl: 60 })

or the cache API?

VVikash Code of your test? Are you using `kv.get(key, { cacheTtl: 60 })` or the cache ...

SK•12/10/23, 1:24 AM

https://gist.github.com/Repo-SK/76775be58020c964c17eae45be8b3104

SK•12/10/23, 1:25 AM

/kv uses kv.get with a cacheTtl value of an hour (3600) and /kv-cache-api uses the cache api

SK•12/10/23, 1:25 AM

for the benchmark simply send requests to both endpoints and extract the latencies from the html returned (I used a python script to send 100 requests to each)

kian•12/10/23, 6:18 PM

As in the read takes that long to fulfill, or that long until you see the new value?

zehawk•12/16/23, 3:09 PM

Where does one see how much storage is being used by KV? I can never get an accurate value. I got billed for 1.69GB while the KV page shows 67KB. So what gives?

Mmatt_d @izdi No, this behavior is an inescapable aspect of WorkersKV.

Advany•12/17/23, 1:00 PM

is it already as fast as 5 seconds? I though it would take up to 60 seconds to get consistent with the write

Zzehawk Where does one see how much storage is being used by KV? I can never get an accu...

Matt Silverlock•12/17/23, 1:03 PM

Please open a Support ticket here.

AAdvany is it already as fast as 5 seconds? I though it would take up to 60 seconds to g...

Matt Silverlock•12/17/23, 2:32 PM

60s for values to refresh (eventual consistency). If you read a key, you will implicitly cache the empty/null value. You can read new keys faster than 60s on first read.

Advany•12/17/23, 2:33 PM

Awesome! Just wanted to verify. Hopefully one day we will see faster refreshes but good for now!

AAdvany is it already as fast as 5 seconds? I though it would take up to 60 seconds to g...

Hello, I’m Allie!•12/17/23, 2:39 PM

This also assumes you haven’t set a higher CacheTTL

HHello, I’m Allie!This also assumes you haven’t set a higher CacheTTL

Advany•12/17/23, 3:07 PM

Yeah a while back there was talk about a new version of KV that would refresh faster even with a higher CacheTTL. There where talks of 15 seconds

AAdvany Yeah a while back there was talk about a new version of KV that would refresh fa...

Hello, I’m Allie!•12/17/23, 3:28 PM

Yeah, that was v2, but it got rolled back a while ago

bonald•12/18/23, 2:55 AM

16ms latency for kv , is this chat real? was looking the test redis vs kv . i guess theres no test to do. is this real?

kian•12/18/23, 2:56 AM

For a cached read? Sounds right to me.

Bbonald 16ms latency for kv , is this chat real? was looking the test redis vs kv . i gu...

Advany•12/18/23, 8:41 AM

a kv is cached locally using Cache. Thats why second reads on the same location are faster

HHello, I’m Allie!Yeah, that was v2, but it got rolled back a while ago

Advany•12/18/23, 8:41 AM

aaaah good to know they are still working on that!

Befus•12/20/23, 11:50 AM

How would I store an image inside KV? Not using cloudflare images

BBefus How would I store an image inside KV? Not using cloudflare images

Isaac McFadyen•12/20/23, 12:01 PM

You'd probably encode it as an ArrayBuffer. Keep in mind that will buffer the image into the Worker's RAM, but I don't think there's any way to stream directly to/from KV.

Isaac McFadyen•12/20/23, 12:01 PM

Oh actually, there is!

Isaac McFadyen•12/20/23, 12:01 PM

You can directly write a ReadableStream: https://developers.cloudflare.com/kv/api/write-key-value-pairs/

Isaac McFadyen•12/20/23, 12:02 PM

So you'd look at your request, see if it's an image that you want to upload (based on whatever factors you want), then do a env.KV_BINDING.put("imagename", request.body)env.KV_BINDING.put("imagename", request.body)

I will say though with KV only having 1 extra origin I do almost never see a reason to use KV instea

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