JSON failed to resolve when use item in withParam

[shuangkun]

Pre-requisites

• I have double-checked my configuration
• I have tested with the :latest image tag (i.e. quay.io/argoproj/workflow-controller:latest) and can confirm the issue still exists on :latest. If not, I have explained why, in detail, in my description below.
• I have searched existing issues and could not find a match for this bug
• I'd like to contribute the fix myself (see contributing guide)

What happened? What did you expect to happen?

Name:                parameter-aggregation-dag-2b7jx
Namespace:           argo
ServiceAccount:      unset (will run with the default ServiceAccount)
Status:              Error
Conditions:
 PodRunning          False
 Completed           True
Created:             Fri Aug 30 12:10:32 +0800 (19 minutes ago)
Started:             Fri Aug 30 12:10:32 +0800 (19 minutes ago)
Finished:            Fri Aug 30 12:10:38 +0800 (19 minutes ago)
Duration:            6 seconds
Progress:            2/2
ResourcesDuration:   0s*(1 cpu),4s*(100Mi memory)
Parameters:
  num:               [
  { "num": "1"},
  { "num": "2"}
]

STEP                                TEMPLATE               PODNAME                                                 DURATION  MESSAGE
 ⚠ parameter-aggregation-dag-2b7jx  parameter-aggregation
 ├─✔ odd-or-even(0:num:1)           odd-or-even            parameter-aggregation-dag-2b7jx-odd-or-even-3541553772  3s
 ├─✔ odd-or-even(1:num:2)           odd-or-even            parameter-aggregation-dag-2b7jx-odd-or-even-2811640102  3s
 └─⚠ print-message                  print-message                                                                            failed to resolve {{item.sample}}

Version(s)

latest

Paste a minimal workflow that reproduces the issue. We must be able to run the workflow; don't enter a workflows that uses private images.

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: parameter-aggregation-dag-
spec:
  entrypoint: parameter-aggregation
  arguments:
    parameters:
      - name: num
        value: |
          [
            { "num": "1"},
            { "num": "2"}
          ]
  templates:
    - name: parameter-aggregation
      dag:
        tasks:
          - name: odd-or-even
            template: odd-or-even
            arguments:
              parameters:
                - name: num
                  value: "{{item.num}}"
            withParam: "{{workflow.parameters.num}}"
          - name: print-message
            depends: "odd-or-even"
            template: print-message
            arguments:
              parameters:
                - name: sample
                  value: "{{item.sample}}"
                - name: r1
                  value: "{{item.r1}}"
            withParam: "{{tasks.odd-or-even.outputs.parameters.qc-fastqs}}"

    - name: odd-or-even
      inputs:
        parameters:
          - name: num
      container:
        image: alpine:latest
        imagePullPolicy: IfNotPresent
        command: [sh, -c]
        args:
          - |
            echo '{"sample": "{{inputs.parameters.num}}","r1": "r1"}' > /tmp/test.json
      outputs:
        parameters:
          - name: qc-fastqs
            valueFrom:
              path: /tmp/test.json
    # print-message prints a number
    - name: print-message
      inputs:
        parameters:
          - name: sample
          - name: r1
      container:
        image: busybox
        imagePullPolicy: IfNotPresent
        command: [echo]
        args: ["{{inputs.parameters.sample}}"]

Logs from the workflow controller

kubectl logs -n argo deploy/workflow-controller | grep ${workflow}

Logs from in your workflow's wait container

kubectl logs -n argo -c wait -l workflows.argoproj.io/workflow=${workflow},workflow.argoproj.io/phase!=Succeeded

[Joibel]

I imagine it's a similar kind of cause to #13510. #13513 won't fix this one though.

[tooptoop4]

similar to #13535