Show only supported VM sizes when we create a HDInsight cluster on Azure portal
When we create a HDInsight cluster on Azure portal, we can choose any VM sizes even if it isn't supported at the specified region. For example, Japan West doesn't support v2 size but we can choose it for worker nodes. Then, the deployment failed with the error "DeploymentDocument 'CsmDocuemtn20' failed the validation. Error: 'VM size xxxxx_V2' provided in the CSM document is invalid or not supported for role 'workdernode''". Moreover, we can see HDInsight resource on Azure portal although the deployment failed. So, users have to delete it manually.
It would be better if unsuppoted VM sizes wouldn't be shown on the portal. Or, the validation should be run before sending a create request