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Update outdated work stealing docs regarding worker restrictions #9214

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Update outdated work stealing docs regarding worker restrictions #9214

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10 changes: 8 additions & 2 deletions docs/source/work-stealing.rst
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Expand Up @@ -79,8 +79,14 @@ than workers with just a few excess tasks.
Restrictions
~~~~~~~~~~~~

If a task has been specifically restricted to run on particular workers (such
as is the case when special hardware is required) then we do not steal.
If a task has been specifically restricted to run on a subset of workers
(for example, using ``workers=...`` and ``allow_other_workers=False``, or by
requiring specific ``resources``, such as for specific hardware requirements
or constrained environments), the scheduler will still actively attempt to
steal the task to balance the load.
However, the scheduler will strictly enforce those restrictions during the steal.
The task will only ever be stolen by an idle worker that is explicitly part of
the allowed worker subset and possesses the necessary available resources.

Choosing tasks to steal
-----------------------
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