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7 changes: 4 additions & 3 deletions src/specify_cli/workflows/steps/fan_out/__init__.py
Original file line number Diff line number Diff line change
Expand Up @@ -12,9 +12,10 @@ class FanOutStep(StepBase):
"""Dispatch a step template for each item in a collection.

The engine executes the nested ``step:`` template once per item,
setting ``context.item`` for each iteration. Execution is
currently sequential; ``max_concurrency`` is accepted but not
enforced.
setting ``context.item`` for each iteration. ``max_concurrency``
controls parallelism: ``<= 1`` (the default) runs items
sequentially, while ``> 1`` runs up to that many items concurrently
on a bounded thread pool (see ``WorkflowEngine._run_fan_out``).
"""

type_key = "fan-out"
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