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Update api-conventions.md 

Clarify validation change rules.
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Brian Grant 2017-03-23 14:52:00 -07:00 committed by GitHub
parent 6c7eed7798
commit 182aeb686f
1 changed files with 7 additions and 4 deletions
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contributors/devel/api-conventions.md
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@ -1471,10 +1471,13 @@ like "larger than", "bigger than", "more than", "higher than", etc.
on both mutation and read. Old clients must continue to function properly while only manipulating on both mutation and read. Old clients must continue to function properly while only manipulating
the old field. New clients must be able to function properly while only manipulating the new the old field. New clients must be able to function properly while only manipulating the new
field. field.
* Validation rules on spec fields can be relaxed but not strengthened -- any requests that * Changing any validation rules always has the potential of breaking some client, since it changes the
previously worked must continue to work. The opposite is true for status fields. Note that changing assumptions about part of the API, similar to adding new enum values. Validation rules on spec fields can
any validation rules always has the potential of breaking some client, since it changes the neither be relaxed nor strengthened. Strengthening cannot be permitted because any requests that previously
assumptions about part of the API, similar to adding new enum values. worked must continue to work. Weakening validation has the potential to break other consumers and generators
of the API resource. Status fields whose writers are under our control (e.g., written by non-pluggable
controllers), may potentially tighten validation, since that would cause a subset of previously valid
values to be observable by clients.
<!-- BEGIN MUNGE: GENERATED_ANALYTICS --> <!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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