[scheduler] Honor false for distinct hosts constraint
#16907
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Co-authored-by: Michael Schurter <mschurter@hashicorp.com>
angrycub
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backport/1.3.x
This was referenced Apr 17, 2023
tgross
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Apr 18, 2023
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Looks like @schmichael beat me to the punch on reviewing this, but just wanted to say LGTM and the PR description here was top notch!
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Currently, when checking a nodes feasibility against the
distinct_hostsconstraint, the mere presence of the constraint is sufficient to activate it; however, the documentation indicates that setting the value to false is a legitimate answer.The
jobspecHCL1 parser would look for cases where the value was set to false and strip it from the generated job specification before submission. Thejobspec2HCL2 parser writes it into the specification with the provided value whether true or false.This has the consequence of causing jobs or tasks with a distinct_hosts constraint to always act as though the value is set to true.
Fixes #13861
false