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Nested scatter blocks

See original GitHub issue

It would be great if Cromwell supported nested scatter blocks. For example:

workflow wf {

  Array[Array[String]] array

  scatter (arr in array) {
    scatter (i in arr) {
      call foo {
        input: str=i
      }
    }
  }
}

Issue Analytics

State:
Created 7 years ago
Reactions:6
Comments:16 (4 by maintainers)

Top GitHub Comments

1reaction

yfarjouncommented, Sep 20, 2021

I have managed to run nested scatters on Terra in Cromwell 67. So…that’s a yes!

1reaction

alongalorcommented, Sep 4, 2017

If that isn’t good enough (e.g. you need to do something to a before you scatter over the bs), you can put the inner scatter into a sub-workflow and Cromwell will be able to run it just fine.

This is what I have implemented in order to get around this but it adds significant complexity to code. I agree that support for a nested scatter option is an excellent idea and would save pipeline writers a lot of time.

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