Question: support ParallelFor params which was defined in input/out

[fenglixa]

If loop parameters are static, then we can parallel instance several taskrun with different parameter to workaround it.
But if the loop parameters are from the input/output parameter of pipeline/tasks, how it works for tekton pipeline?
e.g: https://github.com/kubeflow/pipelines/blob/master/samples/core/loop_parameter/loop_parameter.py

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[fenglixa]

@afrittoli @animeshsingh @vincent-pli @ckadner @Tomcli could you help?

[fenglixa]

/kind question

[fenglixa]

Since Tekton doesn't have loop/recursion support, PR #67 will workaround the static parameters by flatten the loop with parallel taskruns.
But if it's dynamic params (e.g: input/output), seems we still need Tekton have this feature to address it.

[animeshsingh]

I belive we need inputs from @afrittoli @vincent-pli for this. Is there a view of how any pipelines currently are using dynamic links?

[afrittoli]

We started looking at this kind of feature on Tekton side. Until we implement it I don't think there's a way to support the dynamic case.
We could perhaps have a single running over the params in a loop. It would not be parallel but it might work.

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