it's a problem, but why business use gray release, but we reject to the solution?
2018年5月14日星期一，bismy <bi...@qq.com> 写道： > When service center all instances stoped and then started. This is normal > when we are doing maintenance. e.g. upgrading > > > > > ------------------ 原始邮件 ------------------ > 发件人: "wjm wjm"<zzz...@gmail.com>; > 发送时间: 2018年5月14日(星期一) 中午12:36 > 收件人: "dev"<dev@servicecomb.apache.org>; > > 主题: Re: [Discussion]About service instances discovery reliable problems > > > > " When service center restarted" > > that means one instance of SC cluster, or whole SC cluster? > even one instance restart will clear all information? > > 2018-05-14 12:03 GMT+08:00 bismy <bi...@qq.com>: > > > Hi All, > > > > > > Now we meet a reliable problem. When service center restarted, It will > > clear all service instances information. > > And when SDK(java-chassis) queries instance list periodically, it will > get > > an empty list and invocation will fail. > > > > > > In order to resolve this problem, two solutions is suggested: > > 1. service center provide instances persistence mechanism. When service > > center restarted, it will restore instance information, > > and re-calculate the timeout information(e.g. reset instance last active > > time to startup time). If he gets the heartbeat from instance, the > instance > > will not be removed, and after timeout, > > it can removed instances, like the normal way. > > 2. SDK need to take special care with instances remove. SDK don't > > actually remove instances when he gets empty list from service center and > > it will ping the instances. If ping return > > OK, the instance will not removed. > > > > > > Known consequencies: > > Solution 2: > > a. Conflicts with service center white/black rule. > > b. In docker or some instances changed frequently scenario, the ip/port > > is reused by many services when service start/stop, and service health > URL > > may also be the same. So it will give a lot of 400 like error when > > instances is not updated. > > > > > > Any suggestions?
