yes, my viewpoint is the same, hostname or IP has no difference for IoTDB. The core is, we need to use node identifiers to distinguish nodes.
Best, ----------------------------------- Xiangdong Huang School of Software, Tsinghua University 黄向东 清华大学 软件学院 Houliang Qi <neuyi...@163.com> 于2021年8月27日周五 下午1:23写道： > > Hi, Xiangdong > > > > I do not think we will abandon using IP. Either using IP or hostname > > depends on users. If they are sure they have a good DNS, they can use DNS; > > If they like IP or the nodes do not set the DNS, they can use IP. If they > > like, they can also mix-use the hostname and IP addresses. We do not need > > to care….. > > > As mentioned above, since users can use either IP or hostname, I don't > realize what the focus of this discussion is. I think the focus is on what > the user manual is exposed to the user? What are the functions provided? As > for the implementation of the code, I think it is OK to use hostname or IP. > > > In the k8s cluster, the hostname of some pods is also changed. If we only > replace IP with hostname, it will not make our iotdb run perfectly on k8s. > Therefore, I think it is not important to use hostname or IP. The important > thing is to realize the function of automatic service maintenance that can be > deployed on k8s. > > > Thanks, > --------------------------------------- > Houliang Qi > BONC, Ltd > On 08/26/2021 18:29，Xiangdong Huang<saint...@gmail.com> wrote： > Hi, > > DNS request is an additional cost in nodes communication. > > I do not think we will abandon using IP. Either using IP or hostname > depends on users. > If they are sure they have a good DNS, they can use DNS; > If they like IP or the nodes do not set the DNS, they can use IP. > If they like, they can also mix-use the hostname and IP addresses. We > do not need to care..... > > We should make the relationship between node IP, node hostname and node > identifier be clear. > > IMO, node identifier is the only option. > > Best, > ----------------------------------- > Xiangdong Huang > School of Software, Tsinghua University > > 黄向东 > 清华大学 软件学院 > > Eric Pai <ericpa...@hotmail.com> 于2021年8月26日周四 下午4:46写道： > > Hi, Xiangdong, > > Supporting hostname is really a good feature! However, we should consider > these cons carefully: > > 1. DNS request is an additional cost in nodes communication. In cloud > environment, the latency may be as large as hundreds of milliseconds(e.g. > across available regions), and local DNS cache is also an issue in some > extreme scenarios. > 2. We should make the relationship between node IP, node hostname and node > identifier be clear. A node should not be treated as a new one if it changes > its IP or hostname. Or allowing to change IP only. > > 在 2021/8/25 下午11:15，“Xiangdong Huang”<saint...@gmail.com> 写入: > > Hi, > > Today Julian and I discussed some logic of the cluster module. > Both of us feel it strange that we replace the hostname to IP before a > cluster node starts up. > I think it is not a very common way. > > hostname sometimes is very very helpful. For example, in K8S > environment, a node's hostname never changes, but its IP may change. > > Best, > ----------------------------------- > Xiangdong Huang > School of Software, Tsinghua University > > 黄向东 > 清华大学 软件学院 >
