@stuarthalloway If I start using Ions with Solo, will it automatically upgrade to Production if the app demands for it? Or, will I have to do it manually? Your talk on Ions seem to suggest that it will happen automatically, I don't have to worry about the scaling. Please advise.

@amarjeet I believe you must manually upgrade: https://docs.datomic.com/cloud/operation/upgrading.html#upgrading-solo-to-production

Okay

Another query I have: The Datomic Cloud pricing seems to be time-based (usage or no usage) rather than usage-based. Is my understanding correct?

My understanding of usage is Transactions/Queries

@amarjeet pricing is by EC2/hour on instances that run in your account

@stuarthalloway and the software/hr is for datomic - even if there aren't any transaction/queries - because it's just live waiting for transactions/queries? The reason I am asking is because I had tried Aws lambda and dynamodb combination - I wanted to compare the cost impact .

yes, although note that Datomic can do more than transactions / queries, e.g. serve web requests

True, I have better reasons to use Datomic of course :) I was just trying to estimate my pocket burdens.

Thanks, appreciate it.

we ran the Strange Loop CFP app (which is a Datomic cloud app) for about a month, which is relatively low traffic - just people submitting talks and reviewing talks and the Datomic portion of the cost was about $11/month (EC2 may have been like $100 or something, don’t remember)

it’s a little hard to separate out from other stuff in same account, but maybe that arbitrary real data point is useful

this was not ions, just d cloud

(although I intend to move it to ions :)

I expect ions would allow me to drop this cost considerably as the app would run in the instances I have for d cloud rather than on an additional box

and I used to run on-prem on a box on aws, that at least twice as expensive

Hmm, this is helpful, thanks :)

nothing beats just trying it of course

you can get daily spend numbers in aws

Yes, have decided to test this for a few days

(datomic ions) sometimes the lambda called by api gateway fails with:

{
  "errorMessage": "Timeout connecting to cluster node.",
  "errorType": "datomic.ion.lambda.handler.exceptions.Unavailable",
  "stackTrace": [
    "datomic.ion.lambda.handler$throw_anomaly.invokeStatic(handler.clj:24)",
    "datomic.ion.lambda.handler$throw_anomaly.invoke(handler.clj:20)",
    "datomic.ion.lambda.handler.Handler.on_anomaly(handler.clj:139)",
    "datomic.ion.lambda.handler.Handler.handle_request(handler.clj:155)",
    "datomic.ion.lambda.handler$fn__4062$G__3998__4067.invoke(handler.clj:70)",
    "datomic.ion.lambda.handler$fn__4062$G__3997__4073.invoke(handler.clj:70)",
    "clojure.lang.Var.invoke(Var.java:396)",
    "datomic.ion.lambda.handler.Thunk.handleRequest(Thunk.java:35)"
  ]
}

anybody knows what the problem is? :thinking_face: