command)) {
if (jsonParameters.getParameter(JsonParameters.INSTANCE_NAME) != null) {
setupTool.addInstanceToCluster(clusterName,
jsonParameters.getParameter(JsonParameters.INSTANCE_NAME));
} else if (jsonParameters.getParameter(JsonParameters.INSTANCE_NAMES) != null) {
setupTool.addInstancesToCluster(clusterName,
jsonParameters.getParameter(JsonParameters.INSTANCE_NAMES).split(";"));
} else {
throw new HelixException("Missing Json paramaters: '" + JsonParameters.INSTANCE_NAME
+ "' or '" + JsonParameters.INSTANCE_NAMES + "' ");
}