Why? What? How?

[nelsonic]

The home page https://temporal.io is a classic landing page ... tells me nothing

Lots of social proof: 🙄

This homepage has told me exactly zero of What I'm looking at or How it works. 🤦‍♂️

[nelsonic]

https://docs.temporal.io/blog/typescript-beta/

[nelsonic]

The hero text at the top of the Use Cases page https://temporal.io/use-cases is more social proof noise:

Keep scrolling and it's logos ...

At no point do they actually give any inkling what the actual use case might be!! 😡

[nelsonic]

Busy watching this: Designing a Workflow Engine from First Principles: https://youtu.be/t524U9CixZ0 📺 ⏳

[nelsonic]

Explaining Worflows, Task Queues ... ⏳

YouTube shortcut for speeding up playback > (Greater-than sign)

[nelsonic]

Most applications use databases for storing Task Queues:

[nelsonic]

Maxim has used the word "scalability" so many times in the last 10 minutes ... 🙄

[nelsonic]

Behind the scenes Temporal is using Elastic for storing data:

[nelsonic]

"Transfer queue mechanism" ...

[nelsonic]

Multicluster deployment:

i.e. paying for many instances ...

[nelsonic]

Wow. talk could have been 5 minutes. talk about dragging it out. 🙄

[nelsonic]

Next:

Complete Intro to Temporal Workshop - TypeScript SDK: https://youtu.be/CeHSmv8oF_4

Published Dec 4, 2021 ... 3 months ago. Is this even still relevant? Surely there are like 10 new frameworks since then!

[nelsonic]

[nelsonic]

Endorsement from Mitchell Hashimoto of Hashicorp:

[nelsonic]

Yah, it uses gRPC under the hood.

Suuuuuuuuuper scalable! 🚀

[nelsonic]

Workflows vs. Activities:

Basically nothing that has a side-effect is allowed in a workflow.

[nelsonic]

57 slides: https://docs.google.com/presentation/d/1mAPYXNmRdDKepXylB91F2uqFyHm8rG12K2PMRHxoUfM/edit#slide=id.g104dc941926_0_182

Intro to Temporal Workshop - TypeScript SDK.pdf

[nelsonic]

https://github.com/temporalio/samples-typescript/

[nelsonic]

gitpod.io/#https://github.com/temporalio/samples-typescript/

[nelsonic]

Loading ...

Good thing nobody is in a hurry. ⏳

[nelsonic]

While I wait ...
Watching this quick intro: https://youtu.be/2HjnQlnA5eY

[nelsonic]

https://github.com/temporalio/sdk-typescript 220 stars ... super popular.

Build failing.
https://github.com/temporalio/sdk-typescript/runs/5457647957?check_suite_focus=true

Bodes well.

[nelsonic]

Following the getting started guide: https://docs.temporal.io/docs/typescript/introduction/#getting-started

Bunch of warnings:

[nelsonic]

To begin development, start Temporal Server:

cd ~/path/to/temporal/docker-compose/
docker-compose up

If you haven’t run Temporal Server before, visit:
https://docs.temporal.io/docs/typescript/getting-started/

Then, in the project directory, using two other shells, run these commands:

npm run start.watch
npm run workflow

Got the following error:

[nodemon] starting `ts-node src/worker.ts`
Found prebuilt bridge module {
  binary: '/Users/n/code/learn-temporal/example/node_modules/@temporalio/core-bridge/releases/x86_64-apple-darwin/index.node'
}
[TransportError: Server connection error: tonic::transport::Error(Transport, hyper::Error(Connect, ConnectError("tcp connect error", Os { code: 61, kind: ConnectionRefused, message: "Connection refused" })))]
[nodemon] app crashed - waiting for file changes before starting...

[nelsonic]

https://temporalio-samplestypesc-kf9hweoq2a6.ws-eu34.gitpod.io/

Hello World Walkthrough in TypeScript:
https://docs.temporal.io/docs/typescript/hello-world/

[nelsonic]

I can certainly see the benefits Temporal.
But the learning curve is steep ...

[nelsonic]

The temporal forum has only 3 threads for the typescript-sdk tag:
https://community.temporal.io/tag/typescript-sdk

Not very active ... 💭

[nelsonic]

"a real life production deployment can have 5 Frontend, 15 History, 17 Matching, and 3 Worker services per cluster."

https://docs.temporal.io/docs/concepts/what-is-a-temporal-cluster

[nelsonic]

Gitpod timed out:

Reloading ...

It didn't save my state ... 🙄
Starting everything again from scratch.

[nelsonic]

Going to try and run everything on localhost instead.

[nelsonic]

https://docs.temporal.io/docs/server/quick-install/

[nelsonic]

Resume: https://docs.temporal.io/docs/typescript/hello-world/

[nelsonic]

Installing docker ... ⏳

Still blows my mind that this app is so ridiculously huge!! 🤯

[nelsonic]

https://docs.docker.com/desktop/mac/install/

[nelsonic]

Read this while waiting ... https://docs.temporal.io/docs/server/production-deployment/

[nelsonic]

Of course it does ...

[nelsonic]

$ docker-compose up
Error response from daemon: dial unix /Users/n/Library/Containers/com.docker.docker/Data/docker.raw.sock: connect: no such file or directory

Trying to run the sample container:

docker run -d -p 80:80 docker/getting-started

Seeing:

Unable to find image 'docker/getting-started:latest' locally
latest: Pulling from docker/getting-started
59bf1c3509f3: Pull complete 
8d6ba530f648: Pull complete 
5288d7ad7a7f: Pull complete 
39e51c61c033: Pull complete 
ee6f71c6f4a8: Pull complete 
f2303c6c8865: Pull complete 
0645fddcff40: Pull complete 
d05ee95f5d2f: Pull complete 
Digest: sha256:aa945bdff163395d3293834697fa91fd4c725f47093ec499f27bc032dc1bdd16
Status: Downloaded newer image for docker/getting-started:latest
64ba27e3e31ba2efe50f5f3a2a12ba5094686dab3cf1fbcb40def900de78065e

[nelsonic]

Fans running on my poor mac ...

[nelsonic]

5 Docker containers running just to do "hello world" in Temporal ... 🙄

http://localhost:8088/

[nelsonic]

[nelsonic]

https://docs.docker.com/compose/reference/up/

[nelsonic]

Once Docker has successfully downloaded all its dependencies and booted the containers,
you should see something similar to the following in the Docker Desktop App:

[nelsonic]

Fun fact: The node_modules directory for the Hello World example in Temporal uses 473.7 MB (504.5 MB on disk) ...

You wouldn't want to have too many of these projects. 🙄

[nelsonic]

https://en.wiktionary.org/wiki/temporal#Etymology_2_2

[nelsonic]

[nelsonic]

Attempting to run docker-compose up -d

Get the following error:

Creating network "temporal-network" with driver "bridge"
Creating temporal-elasticsearch ... error
Creating temporal-postgresql    ...

ERROR: for temporal-elasticsearch  Cannot create container for service elasticsearch: Conflict. The container name "/temporal-elasticsearch" is already in use by container "830fbd148bb1f4e3422901f7ab362f09b40219a
Creating temporal-postgresql    ... error

ERROR: for temporal-postgresql  Cannot create container for service postgresql: Conflict. The container name "/temporal-postgresql" is already in use by container "ed97ad218913ad6d2a2d5ac2fbd13a81e51d7250e002e4ec693b0f63a18d76bc". You have to remove (or rename) that container to be able to reuse that name.

ERROR: for elasticsearch  Cannot create container for service elasticsearch: Conflict. The container name "/temporal-elasticsearch" is already in use by container "830fbd148bb1f4e3422901f7ab362f09b40219ae4d4e82abda8d3f99d36dd16e". You have to remove (or rename) that container to be able to reuse that name.

ERROR: for postgresql  Cannot create container for service postgresql: Conflict. The container name "/temporal-postgresql" is already in use by container "ed97ad218913ad6d2a2d5ac2fbd13a81e51d7250e002e4ec693b0f63a18d76bc". You have to remove (or rename) that container to be able to reuse that name.
ERROR: Encountered errors while bringing up the project.
n@MBP docker-compose % docker-compose down --remove-orphans
Removing network temporal-network
n@MBP docker-compose % docker-compose up -d
Creating network "temporal-network" with driver "bridge"
Creating temporal-postgresql ...
Creating temporal-elasticsearch ... error

ERROR: for temporal-elasticsearch  Cannot create container for service elasticsearch: Conflict. The contai
Creating temporal-postgresql    ... error
e4d4e82abda8d3f99d36dd16e". You have to remove (or rename) that container to be able to reuse that name.

ERROR: for temporal-postgresql  Cannot create container for service postgresql: Conflict. The container name "/temporal-postgresql" is already in use by container "ed97ad218913ad6d2a2d5ac2fbd13a81e51d7250e002e4ec693b0f63a18d76bc". You have to remove (or rename) that container to be able to reuse that name.

ERROR: for elasticsearch  Cannot create container for service elasticsearch: Conflict. The container name "/temporal-elasticsearch" is already in use by container "830fbd148bb1f4e3422901f7ab362f09b40219ae4d4e82abda8d3f99d36dd16e". You have to remove (or rename) that container to be able to reuse that name.

ERROR: for postgresql  Cannot create container for service postgresql: Conflict. The container name "/temporal-postgresql" is already in use by container "ed97ad218913ad6d2a2d5ac2fbd13a81e51d7250e002e4ec693b0f63a18d76bc". You have to remove (or rename) that container to be able to reuse that name.
ERROR: Encountered errors while bringing up the project.

[nelsonic]

Thankfully - or sadly depending on your view - this is an issue many people have faced before.
Google search surfaces the following thread: moby/moby#23371

Good thing Docker is so efficient and doesn't take up any space on your SSD ...

Ran:

docker container prune

Purged all the Docker Containers and re-created them to test how long it would take.
Obviously Docker only removed the volumes but not the downloaded dependencies so in actual fact they weren't "purged" at all.

[nelsonic]

docker ps

[nelsonic]

docker.errors.DockerException: Error while fetching server API version: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory'))
[61540] Failed to execute script docker-compose

Had to delete the previous docker containers and re-create them. Then it worked.

[yazinsai]

This is hilarious, and also on the first page of Google for "learn temporal" :) Actually managed to get the darn thing setup after reading through your posts..

[nelsonic]

@yazinsai stoked you found the thread and that it was useful to you in your quest to get Temporal running. Please drop a “like” (⭐) on the repo so I have motivation to continue writing the tutorial. 😜