Support Valkey upgrades on elasticache_global_replication_group #42636
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Once a replication group is added to a global datastore, all of it's engine upgrades need to be controlled on the global datastore. This resource did not support setting an explicit engine value on global datastores, preventing upgrades (hashicorp#41618). Further, if creating a Valkey global datastore by inheriting version from the primary (or manually upgrading the engine of the global datastore in AWS Console), then you could not continue manage the secondary replication groups in terraform. A Valkey engine would cause an incorrect destroy & re-create plan (if using defaults for engine) or a conflict (if trying to set the engine correctly). We remove the default engine value, mark it as computed and add DiffSuppressFunc to engine, engine_version and parmeter_group_name to ignore changes to these attributes in plans when the resource belongs to a global datastore (primary or secondary). Fixes hashicorp#40786 and hashicorp#41713. This also has the benefit of removing the need to add explicit ignore_changes lifecycle blocks to attempt to work around these plans. We update existing documentation on around this.
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May 15, 2025 18:04
This is redis6.x specific. It has nothing to do with my DiffSuppressFunc changes or removing the lifecycle { ignore_changes } blocks. Still needed to pass tests :)
```
Step 2/2 error running import: ImportStateVerify attributes not equivalent. Difference is shown below. The - symbol indicates attributes missing after import.
map[string]string{
- "engine_version": "6.x",
+ "engine_version": "6.2",
}
```
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Once a replication group is added to a global datastore, all of it's engine upgrades need to be controlled on the global datastore. This resource did not support setting an explicit engine value on global datastores, preventing upgrades (#41618).
Further, if creating a Valkey global datastore by inheriting version from the primary (or manually upgrading the engine of the global datastore in AWS Console), then you could not continue manage the secondary replication groups in terraform. A Valkey engine would cause an incorrect destroy & re-create plan (if using defaults for engine) or a conflict (if trying to set the engine correctly). We remove the default engine value, mark it as computed and add DiffSuppressFunc to engine, engine_version and parmeter_group_name to ignore changes to these attributes in plans when the resource belongs to a global datastore (primary or secondary). Fixes #40786 and #41713.
This also has the benefit of removing the need to add explicit ignore_changes lifecycle blocks to attempt to work around these plans. We update existing documentation on around this.
Rollback Plan
If a change needs to be reverted, we will publish an updated version of the library.
Revert the PR. Changes meant to be backwards compatible.
Changes to Security Controls
Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.
No.
Description
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Output from Acceptance Testing
I ran my new tests that cover each of the issues and I sampled through a subset of existing tests (these are long).