Support adding/removing Bigtable clusters

[garye]

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Description

In addition to resizing existing clusters, some customers would like the ability to add or remove clusters in an instance.

[garye]

@rileykarson I have a version of this in the Bigtable client coded up, but what do you think about pushing it to the terraform layer instead?

[rileykarson]

Yeah, we could implement it Terraform-side. Holistically I'm slightly in preference of having it live in the client lib, since then other clients can use the same functionality, but if you're hesitant to expose it there it can live here.

[garye]

I don't really have a problem exposing it in the library, I'll add you to the CL and see what the Go client reviewers have to say.

[garye]

There's some mild pushback against putting this new method in the library, so I'd like to try and find a home for it in this project if possible.

Is the right approach to put a utility method for syncing clusters in https://github.com/terraform-providers/terraform-provider-google/blob/master/google/resource_bigtable_instance.go?

[rileykarson]

Sure!

[rileykarson]

@stankiewicz, let me know if you made any more progress on this that didn't end up on GH. I'll pick this up in a couple weeks if not, and get it in for whatever release happens next after that, somewhere between 3.3.0 and 3.5.0.

[rileykarson]

This will be supported in 3.5.0+.

[ghost]

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