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Parallelism Nested

Note

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

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from hera.workflows import Container, Parameter, Step, Steps, Workflow

with Workflow(
    generate_name="parallelism-nested-",
    entrypoint="parallel-worker",
    arguments=[
        Parameter(name="seq-list", value='["a","b","c","d"]\n'),
        Parameter(name="parallel-list", value="[1,2,3,4]\n"),
    ],
) as w:
    one_job = Container(
        name="one-job",
        image="alpine",
        command=["/bin/sh", "-c"],
        args=["echo {{inputs.parameters.parallel-id}} {{inputs.parameters.seq-id}}; sleep 10"],
        inputs=[Parameter(name="seq-id"), Parameter(name="parallel-id")],
    )

    with Steps(
        name="seq-worker", parallelism=1, inputs=[Parameter(name="seq-list"), Parameter(name="parallel-id")]
    ) as seq_worker:
        with seq_worker.parallel():
            one_job(
                name="seq-step",
                arguments=[
                    seq_worker.get_parameter("parallel-id"),
                    Parameter(name="seq-id", value="{{item}}"),
                ],
                with_param=seq_worker.get_parameter("seq-list"),
            )

    with Steps(
        name="parallel-worker", inputs=[Parameter(name="seq-list"), Parameter(name="parallel-list")]
    ) as parallel_worker:
        Step(
            name="parallel-worker",
            template=seq_worker,
            arguments=[
                seq_worker.get_parameter("seq-list"),
                Parameter(name="parallel-id", value="{{item}}"),
            ],
            with_param=parallel_worker.get_parameter("parallel-list"),
        )

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: parallelism-nested-
spec:
  arguments:
    parameters:
    - name: seq-list
      value: |
        ["a","b","c","d"]
    - name: parallel-list
      value: |
        [1,2,3,4]
  entrypoint: parallel-worker
  templates:
  - container:
      args:
      - echo {{inputs.parameters.parallel-id}} {{inputs.parameters.seq-id}}; sleep
        10
      command:
      - /bin/sh
      - -c
      image: alpine
    inputs:
      parameters:
      - name: seq-id
      - name: parallel-id
    name: one-job
  - inputs:
      parameters:
      - name: seq-list
      - name: parallel-id
    name: seq-worker
    parallelism: 1
    steps:
    - - arguments:
          parameters:
          - name: parallel-id
            value: '{{inputs.parameters.parallel-id}}'
          - name: seq-id
            value: '{{item}}'
        name: seq-step
        template: one-job
        withParam: '{{inputs.parameters.seq-list}}'
  - inputs:
      parameters:
      - name: seq-list
      - name: parallel-list
    name: parallel-worker
    steps:
    - - arguments:
          parameters:
          - name: seq-list
            value: '{{inputs.parameters.seq-list}}'
          - name: parallel-id
            value: '{{item}}'
        name: parallel-worker
        template: seq-worker
        withParam: '{{inputs.parameters.parallel-list}}'

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