dag_diamond.md

Dag Diamond

Note

This example is a replication of an Argo Workflow example in Hera. The upstream example can be found here.

=== "Hera"

```python linenums="1"
from hera.workflows import DAG, Container, Parameter, Workflow

with Workflow(generate_name="dag-diamond-", entrypoint="diamond") as w:
    echo = Container(
        name="echo",
        image="alpine:3.7",
        command=["echo", "{{inputs.parameters.message}}"],
        inputs=[Parameter(name="message")],
    )
    with DAG(name="diamond"):
        A = echo(name="A", arguments={"message": "A"})
        B = echo(name="B", arguments={"message": "B"})
        C = echo(name="C", arguments={"message": "C"})
        D = echo(name="D", arguments={"message": "D"})
        A >> [B, C] >> D
```

=== "YAML"

```yaml linenums="1"
apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: dag-diamond-
spec:
  entrypoint: diamond
  templates:
  - container:
      command:
      - echo
      - '{{inputs.parameters.message}}'
      image: alpine:3.7
    inputs:
      parameters:
      - name: message
    name: echo
  - dag:
      tasks:
      - arguments:
          parameters:
          - name: message
            value: A
        name: A
        template: echo
      - arguments:
          parameters:
          - name: message
            value: B
        depends: A
        name: B
        template: echo
      - arguments:
          parameters:
          - name: message
            value: C
        depends: A
        name: C
        template: echo
      - arguments:
          parameters:
          - name: message
            value: D
        depends: B && C
        name: D
        template: echo
    name: diamond
```