[Bug]: modification of cache_usage_limits (ecpu_per_second or data_storage maximum) in aws_elasticache_serverless_cache results in InvalidParameterCombination: Serverless Cache modifications only support modifying one field per request.

[mshahmoradi87]

Terraform Core Version

1.3.7

AWS Provider Version

5.37.0

Affected Resource(s)

• aws_elasticache_serverless_cache

Expected Behavior

Modification of cache usage limits should be possible, in aws console modifing both limits of storage and ecpu at the same time works.

In the module no modification is possible.

Actual Behavior

plan:

          ~ ecpu_per_second {
              ~ maximum = 1000 -> 2000
            }

result:
InvalidParameterCombination: Serverless Cache modifications only support modifying one field per request.

plan:

          ~ data_storage {
              ~ maximum = 1 -> 2
                # (1 unchanged attribute hidden)
            }

result:
InvalidParameterCombination: Serverless Cache modifications only support modifying one field per request.

Relevant Error/Panic Output Snippet

No response

Terraform Configuration Files

resource "aws_elasticache_serverless_cache" "example" {
engine = "redis"
name = "example"
cache_usage_limits {
data_storage {
maximum = 1
unit = "GB"
}
ecpu_per_second {
maximum = 1000
}
}
daily_snapshot_time = "09:00"
description = "Test Server"
kms_key_id = aws_kms_key.test.arn
major_engine_version = "7"
snapshot_retention_limit = 1
security_group_ids = [aws_security_group.test.id]
subnet_ids = aws_subnet.test[*].id
}

Steps to Reproduce

• create a redis_serverless_module
• try to define or change cache_usage_limits

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

None

[github-actions]

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[mshahmoradi87]

@meetreks please have a look if you have time, thanks in advance.

[zenzedoon]

The ecpu must be 0 ( for unlimited) or between 1000 and 15000000.

[mshahmoradi87]

I see a related issue trigged by @justinretzolk

[rmmathik]

I will have a look and fix it if possible.

[meetreks]

Was able to recreate the issue, let me fix it later today..

[meetreks]

I fixed the issue highlighted for updating data_storage block - https://github.com/meetreks/terraform-provider-aws/pull/new/b-aws_elasticache_serverless_cache

[github-actions]

This functionality has been released in v5.40.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[mshahmoradi87]

@meetreks I have just tried the fix with v5.40.0, now plan works, but if I modify a limit, it results in module replacement,

so it destroyed the cache and recreated it.

[mshahmoradi87]

#36317

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.