[Swift-devel] Interesting observation when running Swift

[Tiberiu Stef-Praun]

I have a workflow along these lines:

// this one generates outputsStage1[]
stage1()
// this one merges the stage1 outputs
stage2(outputsStage1[])

note that it is not outputsStage1=stage1()

Since the outputsStage1 files were not generated yet, I expected that
Karajan waited for them to be created before running stage2, but that
was not the case: stage2 was executed when the workflow started (and
it failed) and caused the workflow to fail.

I know how to fix the workflow, that is not the issue. The issue is
that I expected the workflow to be data-driven, but it seems to be
code driven. Explanation: it attempted to execute a section even if
its input files were not available.

Correct me if I am wrong.
Tibi

-- 
Tiberiu (Tibi) Stef-Praun, PhD
Research Staff, Computation Institute
5640 S. Ellis Ave, #405
University of Chicago
http://www-unix.mcs.anl.gov/~tiberius/