apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/InstanceService.java/InstanceService/findInstancesByIds
class InstanceService:  public List<Instance> findInstancesByIds(Set<Long> instanceIds) {
    Iterable<Instance> instances = instanceRepository.findAllById(instanceIds);
    return Lists.newArrayList(instances);
  }