new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor<ZNRecord>(_zkClient));
Builder keyBuilder = accessor.keyBuilder();
InstanceConfig config = accessor.getProperty(keyBuilder.instanceConfig(instanceName));
config.addTag(tag);
accessor.setProperty(keyBuilder.instanceConfig(instanceName), config);
}
@Override
public void removeInstanceTag(String clusterName, String instanceName, String tag) {
if (!ZKUtil.isClusterSetup(clusterName, _zkClient)) {