Argo允许根据先前步骤的输出动态生成并行工作流步骤。
此处提供了这种动态工作流生成的示例:https://github.com/argoproj/argo/blob/master/examples/loops-param-result.yaml
我正在尝试使用最后的“扇入”步骤创建一个类似的工作流程,该步骤将从动态创建的并行步骤读取输出。这是一个刺路:
apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
generateName: loops-param-result-
spec:
entrypoint: loop-param-result-example
templates:
- name: loop-param-result-example
steps:
- - name: generate
template: gen-number-list
- - name: write
template: output-number
arguments:
parameters:
- name: number
value: "{{item}}"
withParam: "{{steps.generate.outputs.result}}"
- - name: fan-in
template: fan-in
arguments:
parameters:
- name: numbers
value: "{{steps.write.outputs.parameters.number}}"
- name: gen-number-list
script:
image: python:alpine3.6
command: [python]
source: |
import json
import sys
json.dump([i for i in range(20, 31)], sys.stdout)
- name: output-number
inputs:
parameters:
- name: number
container:
image: alpine:latest
command: [sh, -c]
args: ["echo {{inputs.parameters.number}} > /tmp/number.txt"]
outputs:
parameters:
- name: number
valueFrom:
path: /tmp/number.txt
- name: fan-in
inputs:
parameters:
- name: numbers
container:
image: alpine:latest
command: [sh, -c]
args: ["echo received {{inputs.parameters.numbers}}"]
我能够提交此工作流程,并且该流程成功运行。不幸的是,最后一个fan-in
步骤的输出如下所示:
fan-in: received {{steps.write.outputs.parameters.number}}
未对输入numbers
的值进行插值。关于如何使它正常工作的任何想法?
答案 0 :(得分:3)
可通过steps.STEP-NAME.outputs.parameters
访问汇总的步骤输出参数。无法通过名称访问一个参数的一组汇总输出。
对工作流程的这一细微更改应该为您提供所需的东西:
apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
generateName: loops-param-result-
spec:
entrypoint: loop-param-result-example
templates:
- name: loop-param-result-example
steps:
- - name: generate
template: gen-number-list
- - name: write
template: output-number
arguments:
parameters:
- name: number
value: "{{item}}"
withParam: "{{steps.generate.outputs.result}}"
- - name: fan-in
template: fan-in
arguments:
parameters:
- name: numbers
value: "{{steps.write.outputs.parameters}}"
- name: gen-number-list
script:
image: python:alpine3.6
command: [python]
source: |
import json
import sys
json.dump([i for i in range(20, 31)], sys.stdout)
- name: output-number
inputs:
parameters:
- name: number
container:
image: alpine:latest
command: [sh, -c]
args: ["echo {{inputs.parameters.number}} > /tmp/number.txt"]
outputs:
parameters:
- name: number
valueFrom:
path: /tmp/number.txt
- name: fan-in
inputs:
parameters:
- name: numbers
container:
image: alpine:latest
command: [sh, -c]
args: ["echo received {{inputs.parameters.numbers}}"]
唯一的变化是从.number
中删除了{{steps.write.outputs.parameters.number}}
。
这是新的输出:
received [{number:20},{number:21},{number:22},{number:23},{number:24},{number:25},{number:26},{number:27},{number:28},{number:29},{number:30}]
这里是GitHub issue where output parameter aggregation was discussed/created。
我放入了enhancement proposal,用于按名称访问汇总的输出参数。