dws: add negative requires hostlist for down rabbits #252
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Problem: Fluxion continues to have problems with rabbits on production systems. However, users need a way for Flux to automatically schedule around down rabbits. As a workaround, maintain a hostlist of all nodes that are attached to down rabbits. Eventually this hostlist should be added to jobs' constraints, as a negative hostlist constraint (like --requires=-hosts:foobar[1-20])
cmoussa1
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Problem: while Fluxion scheduling of rabbits continues to have problems in production, a stopgap is needed to prevent rabbit jobs from running on nodes attached to down rabbits. Make the dws-jobtap plugin add a hostlist constraint for rabbit jobs based on the hostlist of nodes with down rabbits that coral2_dws sends.
Problem: there are no tests to ensure that the dynamic rabbit constraints imposed by coral2-dws actually work as intended. Add tests.
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Problem: Fluxion continues to have problems with rabbits on
production systems. However, users need a way for Flux to
automatically schedule around down rabbits.
As a workaround, maintain a hostlist of all nodes that are attached
to down rabbits. Add this hostlist to jobs' constraints, as a negative hostlist constraint (like
--requires=-hosts:foobar[1-20])