elasticJob 容器化部署节点实例化问题

　　elastic-job会将作业的配置信息、服务器信息等等数据写到zk,其中有个servers节点，其子节点存储作业服务器的IP地址

　　容器化部署的时候，每次重启之后容器ip地址变更，而目前elastic-job写到zk上的是容器地址,不断重启应用之后会导致 servers子节点不断增多，且子节点都是永久节点，不会随着容器的停掉而删除。需要考虑优化自动删除

　　ElasticJob的zk每次都会把serverIp持久化到server节点，容器的ip是变化的，重新部署次数多了以后会导致server节点上持久化ip很多，控制台虽然可以手动删除，但是不便捷，所有考虑到代码优化

　　可以在重写CoordinatorRegistryCenter的时候，其中close方法可以实现我们的需求

直接上代码

 @Override
    public void close() {// servers节点上的ip实例化没有刷新问题
        List<String> jobNameList = getChildrenKeys("/");
        logger.info("refreshServerIp jobNameList = {}", jobNameList);

        if (CollectionUtils.isNotEmpty(jobNameList)) {
            Set<String> outIpList = new HashSet<>();
            for (String jobName : jobNameList) {
                JobNodePath jobNodePath = new JobNodePath(jobName);
                List<String> serverList = getChildrenKeys(jobNodePath.getServerNodePath());
                List<String> instanceList = getChildrenKeys(jobNodePath.getInstancesNodePath());
                Set<String> instanceIpList = new HashSet<>();
                instanceList.forEach(instance -> instanceIpList.add(instance.split("@-@")[0]));
                // 求差集
                for (String item : serverList) {
                    if (!instanceIpList.contains(item)) {
                        outIpList.add(item);
                    }
                }
            }

            logger.info("refreshServerIp outIpList = {}", outIpList);
            if (CollectionUtils.isNotEmpty(outIpList)) {
                for (String serverIp : outIpList) {
                    // shutdown
                    for (String jobName : jobNameList) {
                        JobNodePath jobNodePath = new JobNodePath(jobName);
                        List<String> instances = getChildrenKeys(jobNodePath.getInstancesNodePath());
                        for (String each : instances) {
                            if (serverIp.equals(each.split("@-@")[0])) {
                                remove(jobNodePath.getInstanceNodePath(each));
                            }
                        }
                    }
                    // remove
                    for (String jobName : jobNameList) {
                        remove(new JobNodePath(jobName).getServerNodePath(serverIp));
                    }

                }
            }
        }

        for (Entry<String, TreeCache> each : caches.entrySet()) {
            each.getValue().close();
        }
        waitForCacheClose();
        CloseableUtils.closeQuietly(client);
    }