nacos中DataSyncer的作用是什么
本篇文章为大家展示了nacos中DataSyncer的作用是什么，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
DataSyncer
nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/consistency/ephemeral/distro/DataSyncer.java
@Component@DependsOn("serverListManager")public class DataSyncer { @Autowired private DataStore dataStore; @Autowired private GlobalConfig partitionConfig; @Autowired private Serializer serializer; @Autowired private DistroMapper distroMapper; @Autowired private ServerListManager serverListManager; private Map taskMap = new ConcurrentHashMap<>(); @PostConstruct public void init() { startTimedSync(); } public void submit(SyncTask task, long delay) { // If it's a new task: if (task.getRetryCount() == 0) { Iterator iterator = task.getKeys().iterator(); while (iterator.hasNext()) { String key = iterator.next(); if (StringUtils.isNotBlank(taskMap.putIfAbsent(buildKey(key, task.getTargetServer()), key))) { // associated key already exist: if (Loggers.DISTRO.isDebugEnabled()) { Loggers.DISTRO.debug("sync already in process, key: {}", key); } iterator.remove(); } } } if (task.getKeys().isEmpty()) { // all keys are removed: return; } GlobalExecutor.submitDataSync(new Runnable() { @Override public void run() { try { if (getServers() == null || getServers().isEmpty()) { Loggers.SRV_LOG.warn("try to sync data but server list is empty."); return; } List keys = task.getKeys(); if (Loggers.DISTRO.isDebugEnabled()) { Loggers.DISTRO.debug("sync keys: {}", keys); } Map datumMap = dataStore.batchGet(keys); if (datumMap == null || datumMap.isEmpty()) { // clear all flags of this task: for (String key : task.getKeys()) { taskMap.remove(buildKey(key, task.getTargetServer())); } return; } byte[] data = serializer.serialize(datumMap); long timestamp = System.currentTimeMillis(); boolean success = NamingProxy.syncData(data, task.getTargetServer()); if (!success) { SyncTask syncTask = new SyncTask(); syncTask.setKeys(task.getKeys()); syncTask.setRetryCount(task.getRetryCount() + 1); syncTask.setLastExecuteTime(timestamp); syncTask.setTargetServer(task.getTargetServer()); retrySync(syncTask); } else { // clear all flags of this task: for (String key : task.getKeys()) { taskMap.remove(buildKey(key, task.getTargetServer())); } } } catch (Exception e) { Loggers.DISTRO.error("sync data failed.", e); } } }, delay); } public void retrySync(SyncTask syncTask) { Server server = new Server(); server.setIp(syncTask.getTargetServer().split(":")[0]); server.setServePort(Integer.parseInt(syncTask.getTargetServer().split(":")[1])); if (!getServers().contains(server)) { // if server is no longer in healthy server list, ignore this task: return; } // TODO may choose other retry policy. submit(syncTask, partitionConfig.getSyncRetryDelay()); } public void startTimedSync() { GlobalExecutor.schedulePartitionDataTimedSync(new TimedSync()); } //...... public List getServers() { return serverListManager.getHealthyServers(); } public String buildKey(String key, String targetServer) { return key + UtilsAndCommons.CACHE_KEY_SPLITER + targetServer; }} DataSyncer定义了submit、retrySync、startTimedSync、getServers等方法，其init方法会执行startTimedSync
submit方法对于retryCount为0的任务会判断taskMap是否存在该任务如果存在则移除其taskKey，之后使用GlobalExecutor.submitDataSync提交一个sync任务，它主要是通过NamingProxy.syncData来同步，成功则移除，不成功则使用retrySync重试
retrySync则重新构建server调用submit执行；startTimedSync方法则是使用GlobalExecutor.schedulePartitionDataTimedSync提交TimedSync任务；getServers则通过serverListManager.getHealthyServers()返回健康的实例
TimedSync
nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/consistency/ephemeral/distro/DataSyncer.java
public class TimedSync implements Runnable { @Override public void run() { try { if (Loggers.DISTRO.isDebugEnabled()) { Loggers.DISTRO.debug("server list is: {}", getServers()); } // send local timestamps to other servers: Map keyChecksums = new HashMap<>(64); for (String key : dataStore.keys()) { if (!distroMapper.responsible(KeyBuilder.getServiceName(key))) { continue; } keyChecksums.put(key, dataStore.get(key).value.getChecksum()); } if (keyChecksums.isEmpty()) { return; } if (Loggers.DISTRO.isDebugEnabled()) { Loggers.DISTRO.debug("sync checksums: {}", keyChecksums); } for (Server member : getServers()) { if (NetUtils.localServer().equals(member.getKey())) { continue; } NamingProxy.syncCheckSums(keyChecksums, member.getKey()); } } catch (Exception e) { Loggers.DISTRO.error("timed sync task failed.", e); } } } TimedSync会使用NamingProxy.syncCheckSums同步keyChecksums进行校验
小结
DataSyncer定义了submit、retrySync、startTimedSync、getServers等方法，其init方法会执行startTimedSync
submit方法对于retryCount为0的任务会判断taskMap是否存在该任务如果存在则移除其taskKey，之后使用GlobalExecutor.submitDataSync提交一个sync任务，它主要是通过NamingProxy.syncData来同步，成功则移除，不成功则使用retrySync重试
retrySync则重新构建server调用submit执行；startTimedSync方法则是使用GlobalExecutor.schedulePartitionDataTimedSync提交TimedSync任务；getServers则通过serverListManager.getHealthyServers()返回健康的实例
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