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// root_coord.proto
service RootCoord {
  // NEW
  // CreateAlias creates 1 to 1 mapping between `alias` and `collection_name`
  // 1. If there no `alias` in the metaTable:
  // 	1.1 new `alias` will be added to the metaTable
  // 	1.2 `alias` will be persisted in the `etcd`
  //	1.3 `dd_op` will sent to log broker.
  // 2. If there is `alias/collection` in the metaTable:
  // 	2.1 An `alias/collection already exists` error will be returned.
 rpc CreateAlias(milvus.CreateAliasRequest) returns (common.Status) {}

  // NEW
  // 1. DropAlias
  // 	1.1 Removes existing mapping from the metaTable
  //	1.2 Removes existing mapping from the `etcd`
  //	1.3 `dd_op` will be sent to the log broker.
	//  1.4 Invalidates proxy caches
 rpc DropAlias(milvus.DropAliasRequest) returns (common.Status) {}

 // NEW
 // 1. AlterAlias
 //  1.1 Existing mapping will be updated in metaTable.
 //  1.2 Existing mapping will be updated in `etcd`
 //  1.3 `dd_op` will be sent to log broker.
 //  1.4 Invalidates proxy caches.
 rpc AlterAlias(milvus.AlterAliasRequest) returns (common.Status) {}

 // UPDATED REQUIRED
 // Collection can't be dropped if it is referenced by an `alias`.
 rpc DropCollection(DropCollectionRequest) returns (common.Status) {}
 // UPDATED REQUIRED
 // DescribeCollection now returns `aliases`
 rpc DescribeCollection(DescribeCollectionRequest) returns (DescribeCollectionResponse) {}
}