Cloudflare Developers•8mo ago

I want to experience RealtimeKit. Can someone review it for me?

Yyinxingmaiming6409 I want to experience RealtimeKit. Can someone review it for me?

1984 Ford Laser•5/13/25, 11:43 AM

You need to be posting in #realtime

kchro3•5/13/25, 4:29 PM

Hey, I started seeing a bunch of

D1_ERROR: Network connection lost

D1_ERROR: Network connection lost

(even after adding retries) where every write would fail.

the trace looked like this:

" at D1DatabaseSessionAlwaysPrimary._sendOrThrow (cloudflare-internal:d1-api:125:19) at async D1DatabaseSessionAlwaysPrimary.batch (cloudflare-internal:d1-api:80:23) at async Object.queue (index.js:6144:5)",

" at D1DatabaseSessionAlwaysPrimary._sendOrThrow (cloudflare-internal:d1-api:125:19) at async D1DatabaseSessionAlwaysPrimary.batch (cloudflare-internal:d1-api:80:23) at async Object.queue (index.js:6144:5)",

i was trying to use batch on a list of insert statements like this:

await env.D1.batch(
  batch.map((item) => stmt.bind(...))
);

await env.D1.batch(
  batch.map((item) => stmt.bind(...))
);

is there a soft limit on how large a batch can be? i was able to resolve it by breaking up the batches into smaller batches of 25, but it wasn't causing problems before and the full batch size is <100

Tuna•5/13/25, 6:59 PM

Hi,

I have workers, durableObject lets say one durableObject is for keep track of uploads from client to server (i have my own API for multipart upload), the second is for access to R2 and also used as life cycle, alarm is set for TTL and after that its deleting the file/s from R2.

Im wondering what will be best practice, i want the durableObject to sync R1, like when user upload files, it will keep track in durable object but also sync the global database R1 which will be per user, and i will need one database for all users.
i also have an api gateway worker with itty router to handle rest API.

should i update the D1 from the router handler / workers ? should i clean the R2 from the alarm?
or should i use queues?
if i use queues for async operations, they need to be bounded to the same worker or i can set the main worker to be producer and create a second worker to be the consumer ?

parisholley•5/13/25, 7:22 PM

anyone seeing a higher than usual amount of D1 errors (timeout, connection lost, etc)

kchro3•5/14/25, 1:02 AM

yes, i saw a huge spike of errors in the last week without changing the code at all

Pparisholley anyone seeing a higher than usual amount of D1 errors (timeout, connection lost,...

gruntlord6•5/14/25, 5:03 AM

yea had an automated job fail because it could not create a table this morning due to D1 timing out

parisholley•5/14/25, 2:17 PM

do reads effectively "lock" the d1 database? eg: if i'm doing an expensive read-only query that takes 1-2s, does this prevent other clients from doing reads?

Dean•5/15/25, 12:25 AM

i thought reads were multi-threaded but writes are single threaded

Dean•5/15/25, 12:26 AM

is dynamic bindings for D1 coming eventually? I've been working around it for a while but need to start to re-think it long term if it's never going to arrive

DDean is dynamic bindings for D1 coming eventually? I've been working around it for a ...

Hard@Work•5/15/25, 12:45 AM

SQLite DOs are kind of dynamic bindings? They have most of the features, minus read replicas, but with scripting next to the DB

HHard@Work SQLite DOs are kind of dynamic bindings? They have most of the features, minus r...

Dean•5/15/25, 12:50 AM

i get DO's exist, but i built the platform around D1 with dynamic bindings coming eventually (which is fine). I'm hesitant to change everything from D1 -> DO and then D1 ends up with dynamic binding support and I've wasted my time. Eventually i'd like these databases replicated so I'm sort of in limbo.

Deda•5/15/25, 1:05 AM

is it possible to connect to the d1 trought the node.js app locally, or its only available for the workers?

Chaika•5/15/25, 1:23 AM

?d1-remote-connections

SuperHelpflare•5/15/25, 1:23 AM

Accessing D1 from outside workers:

D1 is based on SQLite, which does not natively support remote connections and isn't MySQL/PostgreSQL wire compatible, nor does D1 itself offer that functionality. As such, your options are:

1 -> The Cloudflare API Query Endpoint (https://developers.cloudflare.com/api/operations/cloudflare-d1-query-database), with the upside of needing less setup, all requests have to go back to Cloudflare's core, so request latency is far from optimal from some locations. You would also be subject to the API Rate limit of 1200 requests per 5 minutes.

2 -> Create a worker to proxy requests to your D1 Database. Either tightly bound to your application/schema or loose and just accepting any query. This would allow your worker to execute potentially closer to your D1 Database and avoid the api rate limit.

Ffrankichiro Hello! What is the correct API request to get the same info as `wrangler d1 info...

Chaika•5/15/25, 8:39 PM

Wrangler is using GraphQL
https://github.com/cloudflare/workers-sdk/blob/02d40ed3bbfc9cb4c2f95fb921efd7ec56f141a6/packages/wrangler/src/d1/info.ts#L57

GitHub

workers-sdk/packages/wrangler/src/d1/info.ts at 02d40ed3bbfc9cb4c2f...

Home to Wrangler, the CLI for Cloudflare Workers® - cloudflare/workers-sdk

Chaika•5/15/25, 8:39 PM

can see the exact query there. Wrangler's all open source

aza547•5/16/25, 11:36 AM

I'm seeing spikes of D1 failures periodically when querying my database recently. It doesn't feel like the normal level of background failures you might just retry to avoid. The errors all seem to be one of:

D1_ERROR: D1 DB storage operation exceeded timeout which caused object to be reset

D1_ERROR: D1 DB storage operation exceeded timeout which caused object to be reset

D1_ERROR: Network connection lost.

D1_ERROR: Network connection lost.

D1_ERROR: internal error; reference = 3n7qu7dkdd0atgp7vioes6a5

D1_ERROR: internal error; reference = 3n7qu7dkdd0atgp7vioes6a5

Is anyone able to advise on this? My database ID is

589bafbd-d600-4e01-8879-7443811d45a1

589bafbd-d600-4e01-8879-7443811d45a1

if that's of any use.

garff•5/16/25, 11:39 AM

Hi. I was wondering if it is possible to do transactions using the workers-qb/D1 query bilder? Is there some syntax I do not know about?

Ggarff Hi. I was wondering if it is possible to do transactions using the workers-qb/D1...

gruntlord6•5/17/25, 12:17 AM

Does batch work?

Ggruntlord6 Does batch work?

garff•5/17/25, 11:09 AM

Yea. It greats. Found the right part of the documentation. Thx for replying though!

HHard@Work SQLite DOs are kind of dynamic bindings? They have most of the features, minus r...

Dean•5/18/25, 3:35 PM

Looking into durable objects more today - they need to be binded to a worker which is the same problem I have with d1.

DDean Looking into durable objects more today - they need to be binded to a worker whi...

Hello, I’m Allie!•5/18/25, 4:15 PM

Sort of? You bind a DO namespace to your Worker once, but from that namespace, you pass an ID and get as many DOs as you want

Hello, I’m Allie!•5/18/25, 4:15 PM

One Namespace -> Many “Databases”

gruntlord6•5/19/25, 12:28 AM

yup, you can have a lot of individual objects in a single namespace

gruntlord6•5/19/25, 12:28 AM

for example, an object for every customer

gruntlord6•5/19/25, 12:29 AM

where as with D1 you need a binding for every db

planet•5/19/25, 1:52 AM

Does a primary get replicated to multiple replicas, or just a single replica per region?

e.g. does a WNAM primary gets replicated to a single ENAM location, or multiple ENAM locations?

Pplanet Does a primary get replicated to multiple replicas, or just a single replica per...

Chaika•5/19/25, 2:02 AM

currently just one replica per region, including the primary region

Rripes Bumping this. Any pointers on importing an existing sqlite db that already has a...

Max (@rozenmd)•5/19/25, 8:18 AM

https://developers.cloudflare.com/d1/best-practices/import-export-data/#known-limitations

Disciple of Caoximeihao•5/19/25, 9:16 AM

Is there a way to export the database but still have it read and write normally in production?

Disciple of Caoximeihao•5/19/25, 9:16 AM

Is there a way to export the database but still have it read and write normally in production?

xeon06•5/19/25, 3:43 PM

Is there anyone working on a D1 client for workers with built-in retry, to try and circumvent these issues? https://github.com/cloudflare/cloudflare-docs/issues/18485

xeon06•5/19/25, 3:56 PM

I suppose it isn't that simple to enforce idempotency

.ul0gic•5/19/25, 6:46 PM

anyone here familiar or have experience in getting local D1 instances to maintain persistence during local development by chance?

.ul0gic•5/19/25, 7:35 PM

Fixing D1 Local Persistence with Wrangler Pages Dev

Issue

Local D1 persistence with

wrangler pages dev

wrangler pages dev

may not work as expected, even when

preview_database_id

preview_database_id

is set in

wrangler.toml

wrangler.toml

and

--persist-to

--persist-to

is used in the

dev

dev

script. Runtime operations (e.g., API calls creating new data) might connect to a new, blank D1 instance instead of the schema-initialized, persisted one. This leads to "no such table" errors and data loss between development server restarts.

message.txt2.15KB

.ul0gic•5/19/25, 7:37 PM

sorry if that breaks the rules....ive seen a few people ask about this and have this same issue. took multiple days and finally figured it out. hope it helps someone else here struggling with this.

DDean i get DO's exist, but i built the platform around D1 with dynamic bindings comin...

lambrospetrou•5/20/25, 7:39 AM

D1 dynamic bindings are not coming in the short-term, and still undecided for long-term. If you want to programmatically create thousands of databases, SQLite Durable Objects are already available and they are the exact same SQLite components under the hood.

Llambrospetrou D1 dynamic bindings are not coming in the short-term, and still undecided for lo...

Dean•5/20/25, 7:44 AM

It’s a shame that really wasn’t communicated at the start. I’ll have to rewrite everything which is a shame.

DDean It’s a shame that really wasn’t communicated at the start. I’ll have to rewrite ...

lambrospetrou•5/20/25, 9:00 AM

At the start, SQLite DOs didn't exist

Ashish Rawat•5/20/25, 9:42 AM

Durable object is too much boilerplate.

planet•5/20/25, 2:18 PM

meh it only took less than a week to learn how to use SQLite in DO and refactor code

planet•5/20/25, 2:18 PM

you get input gates & (in my testing) much better latencies & less reads/writes because you dont need to index a user id

Ashish Rawat•5/20/25, 2:51 PM

problem is you can't query across multiple database for getting list of users, do joins and so on. So you've to use D1 for that with different concept. Cloudflare database (D1, DO) is broken. D1 has different limitation while DO has different. So basically to make everything work, you need to use both D1, DO and Queues. So instead of this, I better off go with managed postgres.

AAshish Rawat problem is you can't query across multiple database for getting list of users, d...

lambrospetrou•5/20/25, 3:47 PM

So you've to use D1 for that with different concept. Cloudflare database (D1, DO) is broken. D1 has different limitation while DO has different

I wonder why you say this. Actually, D1 has exactly the same limitations as a single Durable Object, and even more since your worker code is remotely from the actual storage and you don't have things like transactions across queries interleaved with JS code, whereas in the DO case your code runs next to the storage and is fast. Resource limits wise, a D1 database IS a single Durable Object, so zero differences.

I assume your different viewpoint is if you design your DO architecture using per-resource/per-tenant DO vs a single D1 database, but then you are not comparing the same thing since managing multiple D1 databases in the same way would be much more complicated.

I want to experience RealtimeKit. Can someone review it for me?

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