zk服務(wù)器異常報(bào)警和線程服務(wù)關(guān)閉機(jī)制

這篇文章主要講解了“zk服務(wù)器異常報(bào)警和線程服務(wù)關(guān)閉機(jī)制”，文中的講解內(nèi)容簡(jiǎn)單清晰，易于學(xué)習(xí)與理解，下面請(qǐng)大家跟著小編的思路慢慢深入，一起來(lái)研究和學(xué)習(xí)“zk服務(wù)器異常報(bào)警和線程服務(wù)關(guān)閉機(jī)制”吧！

主要查看ZooKeeperServer

監(jiān)聽(tīng)與服務(wù)器關(guān)系類(lèi)圖

疑問(wèn)：重要線程關(guān)閉或中斷的時(shí)候？這個(gè)監(jiān)聽(tīng)器在什么時(shí)候被調(diào)用呢？

接口 ZooKeeperServerListener

void notifyStopping(String threadName, int errorCode);

實(shí)現(xiàn)類(lèi)ZooKeeperServerListenerImpl

@Override

public void notifyStopping(String threadName, int exitCode) {

LOG.info("Thread {} exits, error code {}", threadName, exitCode);

zkServer.setState(State.ERROR);

}

報(bào)警危機(jī)線程ZooKeeperCriticalThread繼承了ZooKeeperThread

重新實(shí)現(xiàn)了父類(lèi)方法，調(diào)用監(jiān)聽(tīng)通知方法，改變服務(wù)狀態(tài)

@Override protected void handleException(String threadName, Throwable e) { LOG.error("Severe unrecoverable error, from thread : {}", threadName, e); listener.notifyStopping(threadName, ExitCode.UNEXPECTED_ERROR.getValue()); ServerMetrics.getMetrics().UNRECOVERABLE_ERROR_COUNT.add(1); }

處理器實(shí)現(xiàn)ZooKeeperServerShutdownHandler

private final CountDownLatch shutdownLatch;

void handle(State state) { if (state == State.ERROR || state == State.SHUTDOWN) { shutdownLatch.countDown(); } }

把shutdownLatch減去1

1異常處理流程

SessionTrackerImpl 運(yùn)行中如果遇到異常

catch (InterruptedException e) {

handleException(this.getName(), e);

}

2調(diào)用繼承類(lèi)的方法handleException

3方法中調(diào)用監(jiān)聽(tīng)類(lèi)ZooKeeperServerListener的.notifyStopping通知方法

4通知接口實(shí)現(xiàn)ZooKeeperServerListenerImpl具體指定處理

設(shè)置服務(wù)狀態(tài)為zkServer.setState(State.ERROR);

5調(diào)用zkServer.setState方法，內(nèi)部調(diào)用ZooKeeperServerShutdownHandler處理器方法

6處理器中調(diào)用handle方法

void handle(State state) {

if (state == State.ERROR || state == State.SHUTDOWN) {

shutdownLatch.countDown();

}

}

6 計(jì)數(shù)器關(guān)閉ZooKeeperServerMain中注冊(cè)了關(guān)閉服務(wù)處理器

// Registers shutdown handler which will be used to know the

// server error or shutdown state changes.

final CountDownLatch shutdownLatch = new CountDownLatch(1);

zkServer.registerServerShutdownHandler(new ZooKeeperServerShutdownHandler(shutdownLatch));

...

containerManager.start();

// Watch status of ZooKeeper server. It will do a graceful shutdown

// if the server is not running or hits an internal error.

shutdownLatch.await();

感謝各位的閱讀，以上就是“zk服務(wù)器異常報(bào)警和線程服務(wù)關(guān)閉機(jī)制”的內(nèi)容了，經(jīng)過(guò)本文的學(xué)習(xí)后，相信大家對(duì)zk服務(wù)器異常報(bào)警和線程服務(wù)關(guān)閉機(jī)制這一問(wèn)題有了更深刻的體會(huì)，具體使用情況還需要大家實(shí)踐驗(yàn)證。這里是億速云，小編將為大家推送更多相關(guān)知識(shí)點(diǎn)的文章，歡迎關(guān)注！