search

kudobuilder / kudo

Kubernetes Universal Declarative Operator (KUDO)
https://kudo.dev
Apache License 2.0
1.17k stars 103 forks source link

Document whether tasks run in serial or parallel #1769

Open simonvane opened 3 years ago

simonvane commented 3 years ago

What would you like to be added: Document whether tasks run in serial or parallel

Why is this needed: It is unclear whether tasks run in serial or parallel and whether a strategy can be applied to tasks and it this has just been missed in the documentation. It would be helpful if it was called out explicitly one way or another here https://kudo.dev/docs/developing-operators/tasks.html#overview.

If a strategy cannot be applied to tasks it would be interesting/useful to understand the reasoning for this.

dbarentine commented 3 years ago

@simonvane Does this answer your question?

Note: current implementation will apply all resources in the given order so that e.g. a Pod can mount previously created ConfigMap. However, this is not part of the specification and might change in the future (all resources can be applied concurrently). If you need happens-before-guarantee between your resources, use e.g. multiple serial steps.

simonvane commented 3 years ago

Thanks @dbarentine but I don't think it does.

I think this describes how the resources within a task are applied. What I was asking about is how multiple tasks within a step are run. Phases and steps have a strategy documented but I can't see anything documented about the order tasks within a step are applied and whether they are applied in parallel or serial or whether we can control this.