先上總結：

可以disable job或者server，或者某個server上的job實例

還是會定時調度，但調度過程發現為disable后不運行job

disable 入口代碼：

private void disableOrEnableJobs(final Optional<String> jobName, final Optional<String> serverIp, final boolean disabled) {Preconditions.checkArgument(jobName.isPresent() || serverIp.isPresent(), "At least indicate jobName or serverIp.");if (jobName.isPresent() && serverIp.isPresent()) {persistDisabledOrEnabledJob(jobName.get(), serverIp.get(), disabled);} else if (jobName.isPresent()) {JobNodePath jobNodePath = new JobNodePath(jobName.get());for (String each : regCenter.getChildrenKeys(jobNodePath.getServerNodePath())) {if (disabled) {regCenter.persist(jobNodePath.getServerNodePath(each), "DISABLED");} else {regCenter.persist(jobNodePath.getServerNodePath(each), "");}}} else if (serverIp.isPresent()) {List<String> jobNames = regCenter.getChildrenKeys("/");for (String each : jobNames) {if (regCenter.isExisted(new JobNodePath(each).getServerNodePath(serverIp.get()))) {persistDisabledOrEnabledJob(each, serverIp.get(), disabled);}}}}

disable的nodepath 為 /test-disablejobName/servers/192.168.157.1，即按server 進行disable

JOB調度執行函數為類AbstractElasticJobExecutor的如下代碼：

private void execute(final ShardingContexts shardingContexts, final JobExecutionEvent.ExecutionSource executionSource) {if (shardingContexts.getShardingItemParameters().isEmpty()) {if (shardingContexts.isAllowSendJobEvent()) {jobFacade.postJobStatusTraceEvent(shardingContexts.getTaskId(), State.TASK_FINISHED, String.format("Sharding item for job '%s' is empty.", jobName));}return;}

上面代碼的getShardingItemParameters 會返回empty，shardingContexts的獲取來自以下代碼：

@Overridepublic ShardingContexts getShardingContexts() {boolean isFailover = configService.load(true).isFailover();if (isFailover) {List<Integer> failoverShardingItems = failoverService.getLocalFailoverItems();if (!failoverShardingItems.isEmpty()) {return executionContextService.getJobShardingContext(failoverShardingItems);}}shardingService.shardingIfNecessary();List<Integer> shardingItems = shardingService.getLocalShardingItems();if (isFailover) {shardingItems.removeAll(failoverService.getLocalTakeOffItems());}shardingItems.removeAll(executionService.getDisabledItems(shardingItems));return executionContextService.getJobShardingContext(shardingItems);}

而關鍵的獲取getLocalShardingItems，本地sharding item的相關代碼如下：

/*** 獲取運行在本作業實例的分片項集合.* * @return 運行在本作業實例的分片項集合*/public List<Integer> getLocalShardingItems() {if (JobRegistry.getInstance().isShutdown(jobName) || !serverService.isAvailableServer(JobRegistry.getInstance().getJobInstance(jobName).getIp())) {return Collections.emptyList();}return getShardingItems(JobRegistry.getInstance().getJobInstance(jobName).getJobInstanceId());}/*** 判斷作業服務器是否可用.* * @param ip 作業服務器IP地址* @return 作業服務器是否可用*/public boolean isAvailableServer(final String ip) {return isEnableServer(ip) && hasOnlineInstances(ip);}private boolean hasOnlineInstances(final String ip) {for (String each : jobNodeStorage.getJobNodeChildrenKeys(InstanceNode.ROOT)) {if (each.startsWith(ip)) {return true;}}return false;}/*** 判斷服務器是否啟用.** @param ip 作業服務器IP地址* @return 服務器是否啟用*/public boolean isEnableServer(final String ip) {return !ServerStatus.DISABLED.name().equals(jobNodeStorage.getJobNodeData(serverNode.getServerNode(ip)));}

注意以上的hasOnlineInstances函數及isEnableServer，去zookeeper獲取的相關path里面的狀態被disabled。

總結

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