public static MockClusterMap createOneNodeRecoveryClusterMap(MockDataNodeId recoveryNode, MockDataNodeId vcrNode,
      String dcName) {
    return new MockClusterMap(recoveryNode, vcrNode, dcName);
  }
Create a cluster map for recovery from the given {@code vcrNode} and {@code recoveryNode}.
The cluster is created such that {@code recoveryNode} has {@code vcrNode}'s replicas as peer replicas.
@param recoveryNode The data node.
@param vcrNode The vcr node.
@param dcName Name of the datacenter.
@return {@link MockClusterMap} object.
ambry-test-utils/src/main/java/com/github/ambry/clustermap/MockClusterMap.java