ashug

Thank you! Spot.io falls broadly into the same category as Vantage/Ternary/others, so the same answer as here applies: https://news.ycombinator.com/item?id=39183504.

In a sentence, these tools display the same cost data available within AWS - where max granularity is per-database or per-EC2 instance - whereas, Dashdive can accurately attribute portions of usage on the same DB or instance to different features/customers.

ashug

2년 전discuss

Awesome!! We'll send you an email shortly :)

ashug

2년 전discuss

I'm not familiar with Kinesis's sink APIs, but yes I'd imagine you'll have to write your own connector from scratch.

To answer your question, though, no: in the Kafka connector, the frequency of inserts into ClickHouse is configurable relatively independent of the batch size, so you don't need massive scale for real-time CH inserts. To save you a couple hours, here's an example config for the connector:

  # Snippet from connect-distributed.properties

  # Max bytes per batch: 1 GB
  fetch.max.bytes=1000000000
  consumer.fetch.max.bytes=1000000000
  max.partition.fetch.bytes=1000000000
  consumer.max.partition.fetch.bytes=1000000000

  # Max age per batch: 2 seconds
  fetch.max.wait.ms=2000
  consumer.fetch.max.wait.ms=2000

  # Max records per batch: 1 million
  max.poll.records=1000000
  consumer.max.poll.records=1000000

  # Min bytes per batch: 500 MB
  fetch.min.bytes=500000000
  consumer.fetch.min.bytes=500000000

You also might need to increase `message.max.bytes` on the broker/cluster side.

If you're still deciding, I'd recommend Kafka over Kinesis because (1) it's open source so more options, e.g. self host or Confluent or AWS MSK and (2) it has a much bigger community, meaning better support, more StackOverflow answers, a plug-and-play CH Kafka connector, etc.

ashug

2년 전discuss

Haha, we've heard many a story like this one over the months!

An advisor suggested we offer a sort of "pricing heuristics" deliverable to sales as part of our product (e.g. "if a customer needs feature foo, add $bar to the price"), and your story makes me think he's onto something.

ashug

2년 전discuss

Thanks! It's on the roadmap :)

ashug

2년 전discuss

TL;DR - We treat the per-customer usage data as the ground truth, and the per-customer cost can vary based on parameters chosen by the Dashdive user and their preferred mental model.

At a minimum, every customer is assigned the cost resulting from the usage that is directly attributable to them. This "directly attributable" figure is obtained by "integrating" vCPU-seconds and RAM-seconds on a per-DB-query basis, per-API-invocation basis, or similar. For example, if Customer X used 5 vCPU seconds and 7 RAM-GiB-seconds due to queries over a period of 10 seconds on our RDS cluster with total capacity 1 vCPU and 2 GiB RAM, then they directly utilized 50% of vCPU capacity and [7 GiB-sec / (2 GiB * 10 sec)] = 35% of RAM capacity over that period.

The question remains of how to distribute the cost of the un-utilized capacity over that period amongst the customers, perhaps distributing some portion to special "desired headroom" and "undesired headroom" values. As you mentioned, the answer is subjective and can vary between Dashdive users (or even over time for the same Dashdive user, e.g. a user decides they can reduce their desired headroom from 30% to 20%). The only sensible approach in our opinion is to make this configurable for the user, with sane and explicit defaults.

Let's go through both your examples to illustrate. In example 1, each of the 4 equally sized customers would be assigned only 12.5% of the total cost of the cluster. The dashboard would show that, by default, 30% headroom is desired, so out of the remaining 50% capacity, 30% would be marked as desired headroom, and 20% would be marked as undesired headroom. The user can override the desired headroom percentage. Although in our opinion it is most correct for all headroom to be treated as a fixed cost in multitenant scenarios, we would also provide the option to distribute both/either headroom types amongst all customers, either proportionally or equally.

For example 2, our model is not sophisticated enough to capture the nuance that losing only the larger customer would allow cost reduction. Assuming both customers used both databases (let's say they're replicas or shards), and 0% headroom, we would simply assign 40% of costs to the smaller customer and 60% of costs to the larger one. This is subtle, but the missed nuance is only important if $100/m is the finest-grained resource you can get. Otherwise, if you lose the 40% customer, you can switch to a 2x $60/m DB, for example.

This is a very astute callout! It has come up a couple times as a point of concern from prospective customers. Would be keen to hear if this diverges from your expectations at all.

ashug

2년 전discuss

You're right; it's a bit inaccessible at the moment. We're planning to offer a more affordable tier in the next 1-2 months. A bit more context here: https://news.ycombinator.com/item?id=39178753#39186948.

ashug

2년 전discuss

Thanks! Yes, we're working on making the product more accessible. Right now, for every new customer, we have to manually provision and manage some additional infrastructure. We're worried we could quickly get overextended in both time and cost if we have to do this for lots of users in a free tier for example.

It's on our roadmap in the next 1-2 months to eliminate these manual steps and make these last parts of our infra multitenant. At that point, we plan to release a cheaper tier for individual devs.

ashug

2년 전discuss

Great point. We could definitely add usage-based pricing (UBP) adjacent features - for example, a Stripe integration and user-defined rules to auto-calculate invoices based on incurred cloud usage per-customer. Would that be useful?

However, it's not always possible to infer one's own costs from UBP events. In UBP products, the user defines what constitutes a "usage event" (e.g. "customer generates a PDF") and so these events can be quite disconnected from underlying cloud usage. In other words, there's nothing that prevents some "someone generated a PDF" events from incurring large amounts of EC2 usage while other "someone generated a PDF" events incur very little EC2 usage, depending on the input parameters to the workload. And in most UBP scenarios, this difference in underlying cloud usage from PDF generation to PDF generation is not taken into account; often all UBP events of a given type are billed at the same rate. In fact, we've seen this exact issue in the wild: namely, a company implementing UBP but still being unsure about profit margin because certain UBP event types had high variance in cloud usage per-event.

One company is planning to use Dashdive's S3 storage data to charge their customers based on usage, so in some cases the data we collect can serve as a substitute for UBP.

I agree that it would be more convenient if we also offered user-defined UBP events. This way, we could be a single vendor for the folks that want both usage monitoring and usage-based billing, where the UBP events don't necessarily align super well with underlying cloud usage.

ashug

2년 전discuss

You can use the usage and cost data Dashdive collects to identify cost spikes or ongoing inefficiencies (e.g. this particular feature is using more vCPU than should be necessary). But we won't do any automatic cost cutting for you (some products allow you to buy reserved instances or rightsize from directly within their app).

ashug

2년 전discuss

We actually use Kafka rather than Kinesis, although they're very similar. For writing to ClickHouse from Kafka, we use the ClickHouse Kafka sink connector: https://github.com/ClickHouse/clickhouse-kafka-connect.

ashug

2년 전discuss

Ternary is similar to Vantage in its offering so this answer (https://news.ycombinator.com/item?id=39178753#39181486) also applies here.

There are quite a few cloud cost tools out there which use AWS's cost and usage reports (or GCP/Azure equivalents) as their sources of truth, and as a consequence their data is largely based on tagging cloud resources with attributes of interest (e.g. EC2 instance XXX has tags customerId:ABC, teamId:DEF, featureId:GHI). These include Ternary, Vantage, Yotascale, and others (CloudChipr, CloudZero, Archera, Cloudthread, Finout, Spot by NetApp, DoiT, Tailwarden, CAST AI, Densify, GorillaStack, Economize Cloud). Some of these offer AI-based automatic tagging as well.

But even so, if I - for example - have a lots of k8s replica Pods which serve most of my application traffic, I can't use any of these products to figure out which customers, API endpoints, code paths, features, etc. are costing me the most. At best I could tag the entire Deployment, or maybe even each Pod. But the problem is that every Pod is serving lots of endpoints, customers, and features. However, Dashdive can give you this info.

From a technical implementation standpoint, Dashdive is much closer to application performance monitoring (APM) products or usage based billing products than it is to most cloud cost dashboard products.

ashug

2년 전discuss

Yotascale is in many ways similar to Vantage, so a similar answer to this one (https://news.ycombinator.com/item?id=39178753#39181486) applies.

When we were originally researching to see if anyone had done something like Dashdive already (i.e., specifically applying observability tools / high volume event ingestion to cloud costs), I did manage to find a Yotascale video in which they mentioned defining custom usage events in Kubernetes for a specific customer. It seemed more like a custom feature than a generally available part of their product, but I could be mistaken.

ashug

2년 전discuss

Makes a lot of sense - in my opinion AWS doesn't do the best job with this. We had a similar problem with EKS where even as the root user I couldn't view cluster details (https://medium.com/@elliotgraebert/comparing-the-top-eight-m....).

I agree that this would be a great feature. To be honest, our product isn't currently focused on this sort of automatic management of resource lifecycle; we're much better at data collection. But thank you for flagging this! We'll definitely keep it in mind as we add support for compute services (right now we only support S3 and there's nothing to "spin down").

Edit: The part less related to permissions (how can I kill it) and more related to discoverability (which resource is it) is more adjacent to what we've already built and is something we can take a look at soon. Perhaps we can take a crack at the permissions aspect afterwards.

ashug

2년 전discuss

The key differentiation from Vantage and other similar products is the level of granularity.

Vantage is in the category mentioned above: it combines AWS, GCP, Datadog, Snowflake, etc. cost data in a single dashboard and supports tagging. For example, if I have a single tenant architecture where every customer has their own Postgres RDS instance, I can tag each RDS node with `customerId:XXX`. Then I can get cost broken down by customer ID in Vantage.

However, if my entire app (including every customer) uses the same large RDS instance, or if I'm using a DBaaS like Supabase, tools like Vantage, which rely on tagging at the resource level, cannot show a breakdown of usage or cost per customer. By contrast, we record each query to your monolith or "serverless" DB (SELECT/INSERT/UPDATE) along with the vCPU and memory consumed, tag the query with `customerId` and other relevant attributes, and calculate the cost incurred based on the billing rules of RDS or Supabase.

ashug

2년 전discuss

This is an interesting point, and we could definitely consider something like this. Where exactly do you run into problems?

For example, let's say you've figured out that a particular EC2 instance or database is too costly. What is the sticking point for you in turning it off? Is it that the resource has other essential functions unrelated to the cost spike? Or is it the identification of the exact resource that's the problem?

ashug

2년 전discuss

Usage is what we track directly, and then we apply the cloud provider's billing rules for the given service (e.g. S3) to calculate the resulting costs. So utilization rates for something like a Kubernetes cluster are easy to derive with the data already collected - just take the usage we've tracked and divide by the total resources available to the cluster. We haven't finished the k8s offering yet, but this would be a great feature / view for us to include (the same goes for most other compute offerings, e.g. EC2, ECS).

The same goes for on prem. We don't have any on prem customers currently, but it would be easy to add a feature where you input the total capacity and/or monthly cost of your on prem infrastructure, and use the collected usage data to calculate utilization rate and "effective cost" incurred by each feature, customer, etc. Thanks for the questions!

Submissions

Launch HN: Dashdive (YC W23) – Track your cloud costs precisely

comments