nacos 重启服务

服务的临时实例保存在内存中，一旦重启，服务元数据全部丢失。

server 正常运行

naming 客户端发送心跳给 server

    // com.alibaba.nacos.client.naming.beat.BeatReactor#addBeatInfo
    public void addBeatInfo(String serviceName, BeatInfo beatInfo) {
        NAMING_LOGGER.info("[BEAT] adding beat: {} to beat map.", beatInfo);
        String key = buildKey(serviceName, beatInfo.getIp(), beatInfo.getPort());
        BeatInfo existBeat = null;
        //fix #1733
        if ((existBeat = dom2Beat.remove(key)) != null) {
            existBeat.setStopped(true);
        }
        dom2Beat.put(key, beatInfo);
        executorService.schedule(new BeatTask(beatInfo), beatInfo.getPeriod(), TimeUnit.MILLISECONDS);
        MetricsMonitor.getDom2BeatSizeMonitor().set(dom2Beat.size());
    }

server 重启，数据全部丢失，集群模式下，当前 server 启动时从其他 server 同步数据

    // DistroConsistencyServiceImpl#init
    @PostConstruct
    public void init() {
        GlobalExecutor.submit(new Runnable() {
            @Override
            public void run() {
                try {
                    load();
                } catch (Exception e) {
                    Loggers.DISTRO.error("load data failed.", e);
                }
            }
        });

        executor.submit(notifier);
    }
    
    public boolean syncAllDataFromRemote(Server server) {

        try {
            byte[] data = NamingProxy.getAllData(server.getKey());
            processData(data);
            return true;
        } catch (Exception e) {
            Loggers.DISTRO.error("sync full data from " + server + " failed!", e);
            return false;
        }
    }

naming 客户端发送心跳给 server，发现实例不存在，重新注册实例，server 增加服务数据

    public void run() {
        if (beatInfo.isStopped()) {
            return;
        }
        long nextTime = beatInfo.getPeriod();
        try {
            JSONObject result = serverProxy.sendBeat(beatInfo, BeatReactor.this.lightBeatEnabled);
            long interval = result.getIntValue("clientBeatInterval");
            boolean lightBeatEnabled = false;
            if (result.containsKey(CommonParams.LIGHT_BEAT_ENABLED)) {
                lightBeatEnabled = result.getBooleanValue(CommonParams.LIGHT_BEAT_ENABLED);
            }
            BeatReactor.this.lightBeatEnabled = lightBeatEnabled;
            if (interval > 0) {
                nextTime = interval;
            }
            int code = NamingResponseCode.OK;
            if (result.containsKey(CommonParams.CODE)) {
                code = result.getIntValue(CommonParams.CODE);
            }
            if (code == NamingResponseCode.RESOURCE_NOT_FOUND) {
                Instance instance = new Instance();
                instance.setPort(beatInfo.getPort());
                instance.setIp(beatInfo.getIp());
                instance.setWeight(beatInfo.getWeight());
                instance.setMetadata(beatInfo.getMetadata());
                instance.setClusterName(beatInfo.getCluster());
                instance.setServiceName(beatInfo.getServiceName());
                instance.setInstanceId(instance.getInstanceId());
                instance.setEphemeral(true);
                try {
                    serverProxy.registerService(beatInfo.getServiceName(),
                        NamingUtils.getGroupName(beatInfo.getServiceName()), instance);
                } catch (Exception ignore) {
                }
            }
        } catch (NacosException ne) {
            NAMING_LOGGER.error("[CLIENT-BEAT] failed to send beat: {}, code: {}, msg: {}",
                JSON.toJSONString(beatInfo), ne.getErrCode(), ne.getErrMsg());

        }
        executorService.schedule(new BeatTask(beatInfo), nextTime, TimeUnit.MILLISECONDS);
    }

nacos server 为什么不在本地持久化一份数据呢？

nacos 重启服务

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