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core: do not internalize constraint strings #10896

Merged
merged 4 commits into from
Jul 14, 2021
Merged

core: do not internalize constraint strings #10896

merged 4 commits into from
Jul 14, 2021

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shoenig
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@shoenig shoenig commented Jul 14, 2021

This PR causes Nomad to no longer memoize the String value of
a Constraint. The private memoized variable may or may not be
initialized at any given time, which means a reflect.DeepEqual
comparison between two jobs (e.g. during Plan) may return incorrect
results.

Fixes #10836

@shoenig
core: do not memoize constraint strings
07c57ff 
This PR causes Nomad to no longer memoize the String value of
a Constraint. The private memoized variable may or may not be
initialized at any given time, which means a reflect.DeepEqual
comparison between two jobs (e.g. during Plan) may return incorrect
results.

Fixes #10836
notnoop
notnoop approved these changes Jul 14, 2021
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Wow - that's quite a gotcha! I'd suggest adding a warning about memoized/private fields and also adding a test that triggers #10836 .

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@shoenig shoenig mentioned this pull request Jul 14, 2021
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@shoenig shoenig merged commit 8d0e319 into main Jul 14, 2021
@shoenig shoenig deleted the b-rm-constraint-memoization branch July 14, 2021 16:22
shoenig added a commit that referenced this pull request Jul 15, 2021
@shoenig
core: remove internalization of affinity strings
aa86392 
Basically the same as #10896 but with the Affinity struct.
Since we use reflect.DeepEquals for job comparison, there is
risk of false positives for changes due to a job struct with
memoized vs non-memoized strings.

Closes #10897
@shoenig shoenig mentioned this pull request Jul 15, 2021
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@notnoop notnoop added this to the 1.1.3 milestone Jul 28, 2021
@notnoop notnoop mentioned this pull request Jul 28, 2021
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notnoop pushed a commit that referenced this pull request Jul 29, 2021
@shoenig
Merge pull request #10896 from hashicorp/b-rm-constraint-memoization
c13b770 
core: do not internalize constraint strings
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Plan returns an erroneous in-place update in diff when task group has a constraint
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@shoenig @notnoop @schmichael @lgfa29