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  1. Data Management
  2. DM-16503

Investigate requirements for Butler 3 interoperability


    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: None
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    • Sprint:
      AP F18-6
    • Team:
      Alert Production


      DMTN-098 speculates that it may be possible to write an adapter that allows the same MetricTask to be used with both Butler 2 and Butler 3 workflows. However, the details depend substantially on how the new Butler works and how much custom information the adapter needs (in particular, it's not clear how to create a DatasetTypeDescriptor, one of the classes the PipelineTask API must return). While we can't implement such an adapter until Butler output of measurements is supported, knowing whether or not an adapter is possible affects the best way to implement MetricTask and its subclasses.

      This issue is to spend some time investigating how Butler 3 and PipelineTask interact, and what is "missing" from the Butler 2 equivalents.

      Note that the middleware development team is also working on something that will allow CmdLineTasks to be used as PipelineTasks. Their solution may or may not satisfy our requirements, for the following reasons:

      • it may only work on CmdLineTask, which the metrics support framework does not use
      • even in the Butler 2 context, MetricTask reports the dataset(s) it needs as input. An adapter that can translate this information to a Butler 3 representation may be simpler than one that needs to get the same information from an external source
      • it is not actually clear whether the middleware team's solution is an adapter in the OOD sense, or whether it only maps PipelineTask.run to Task.runDataRef while leaving other PipelineTask capabilities (i.e., dataset management) unsupported

      This potential conflict/redundancy can be addressed once we have a clearer picture of our own requirements.


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                • Assignee:
                  krzys Krzysztof Findeisen
                  krzys Krzysztof Findeisen
                  John Swinbank, Krzysztof Findeisen
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                    Summary Panel