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Which resource exactly is it that is being replaced?  

This sounds like it could be a bug in the library where `deleteBeforeReplace` should have been used. 

`deleteBeforeReplace` doesn't look right to me, because cluster will stay w/o nodes till new node group is created

code

```import * as eks from "@pulumi/eks";
...

commonName = '&lt;env name here&gt;'

const eksCluster = new eks.Cluster(commonName, {
  vpcId: vpc.id,
  fargate: false,
  skipDefaultNodeGroup: true,

...

const eksManagedNodeGroup = eks.createManagedNodeGroup(
  commonName,
  {
    cluster: eksCluster,
    nodeGroupName: commonName,
    nodeRoleArn: eksWorkerNodeGroupRole.arn,
...
  },
  eksCluster
);```

I'd prefer eks lib to make nodeGroupName arg optional and generate it from resource name + suffix, using new suffix everytime new resource is created. The same approach which is usually used in other resources

I think I know what the problem is here - I've opened <https://github.com/pulumi/pulumi-eks/issues/294> to track.