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[scheduler] Honor false
for distinct hosts constraint
#16907
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schmichael
approved these changes
Apr 17, 2023
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Nice find!
Co-authored-by: Michael Schurter <mschurter@hashicorp.com>
This was referenced Apr 17, 2023
tgross
reviewed
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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Labels
backport/1.3.x
backport to 1.3.x release line
backport/1.4.x
backport to 1.4.x release line
backport/1.5.x
backport to 1.5.x release line
theme/scheduling
type/bug
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Currently, when checking a nodes feasibility against the
distinct_hosts
constraint, 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
jobspec
HCL1 parser would look for cases where the value was set to false and strip it from the generated job specification before submission. Thejobspec2
HCL2 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