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add implied data depends_on caveat

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James Bardin 2020-12-11 13:40:10 -05:00
parent 9b0af78f24
commit cd4cb3f8d2
1 changed files with 6 additions and 0 deletions
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6
website/docs/configuration/data-sources.html.md
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@ -118,6 +118,12 @@ Data resources have the same dependency resolution behavior
Setting the `depends_on` meta-argument within `data` blocks defers reading of
the data source until after all changes to the dependencies have been applied.
In order to ensure that data sources are accessing the most up to date
information possible in a wide variety of use cases, arguments directly
referencing managed resources are treated the same as if the resource was
listed in `depends_on`. This behavior can be avoided when desired by indirectly
referencing the managed resource values through a `local` value.
~> **NOTE:** **In Terraform 0.12 and earlier**, due to the data resource behavior of deferring the read until the apply phase when depending on values that are not yet known, using `depends_on` with `data` resources will force the read to always be deferred to the apply phase, and therefore a configuration that uses `depends_on` with a `data` resource can never converge. Due to this behavior, we do not recommend using `depends_on` with data resources.