Examples with NotificationContext org.apache.helix.NotificationContext used on opensource projects

Example 26 with NotificationContext

use of org.apache.helix.NotificationContext in project helix by apache.

the class CallbackHandler method init.

/**
 * Invoke the listener so that it sets up the initial values from the zookeeper if any
 * exists
 */
public void init() {
    if (_batchModeEnabled) {
        _batchProcessThread = new CallbackProcessor(this);
        _batchProcessThread.start();
    }
    updateNotificationTime(System.nanoTime());
    try {
        NotificationContext changeContext = new NotificationContext(_manager);
        changeContext.setType(NotificationContext.Type.INIT);
        changeContext.setChangeType(_changeType);
        enqueueTask(changeContext);
    } catch (Exception e) {
        String msg = "Exception while invoking init callback for listener:" + _listener;
        ZKExceptionHandler.getInstance().handle(msg, e);
    }
}

Example 27 with NotificationContext

use of org.apache.helix.NotificationContext in project helix by apache.

the class CallbackHandler method handleChildChange.

@Override
public void handleChildChange(String parentPath, List<String> currentChilds) {
    if (logger.isDebugEnabled()) {
        logger.debug("Data change callback: child changed, path: " + parentPath + ", current child count: " + currentChilds.size());
    }
    try {
        updateNotificationTime(System.nanoTime());
        if (parentPath != null && parentPath.startsWith(_path)) {
            if (currentChilds == null && parentPath.equals(_path)) {
                // _path has been removed, remove this listener
                // removeListener will call handler.reset(), which in turn call invoke() on FINALIZE type
                _manager.removeListener(_propertyKey, _listener);
            } else {
                NotificationContext changeContext = new NotificationContext(_manager);
                changeContext.setType(NotificationContext.Type.CALLBACK);
                changeContext.setPathChanged(parentPath);
                changeContext.setChangeType(_changeType);
                subscribeForChanges(changeContext.getType(), _path, _watchChild);
                enqueueTask(changeContext);
            }
        }
    } catch (Exception e) {
        String msg = "exception in handling child-change. instance: " + _manager.getInstanceName() + ", parentPath: " + parentPath + ", listener: " + _listener;
        ZKExceptionHandler.getInstance().handle(msg, e);
    }
}

Example 28 with NotificationContext

use of org.apache.helix.NotificationContext in project helix by apache.

the class GenericHelixController method forceRebalance.

/* Trigger a rebalance pipeline */
private void forceRebalance(HelixManager manager, ClusterEventType eventType) {
    NotificationContext changeContext = new NotificationContext(manager);
    changeContext.setType(NotificationContext.Type.CALLBACK);
    ClusterEvent event = new ClusterEvent(_clusterName, eventType);
    event.addAttribute(AttributeName.helixmanager.name(), changeContext.getManager());
    event.addAttribute(AttributeName.changeContext.name(), changeContext);
    event.addAttribute(AttributeName.eventData.name(), new ArrayList<>());
    _taskEventQueue.put(event);
    _eventQueue.put(event);
    logger.info("Controller rebalance event triggered with event type: " + eventType);
}

Example 29 with NotificationContext

use of org.apache.helix.NotificationContext in project helix by apache.

the class GenericHelixController method handleEvent.

/**
 * lock-always: caller always needs to obtain an external lock before call, calls to handleEvent()
 * should be serialized
 * @param event
 */
protected void handleEvent(ClusterEvent event, ClusterDataCache cache) {
    HelixManager manager = event.getAttribute(AttributeName.helixmanager.name());
    if (manager == null) {
        logger.error("No cluster manager in event:" + event.getEventType());
        return;
    }
    if (!manager.isLeader()) {
        logger.error("Cluster manager: " + manager.getInstanceName() + " is not leader for " + manager.getClusterName() + ". Pipeline will not be invoked");
        return;
    }
    // will be excuting in un-paused mode. Which might not be the config in ZK.
    if (_paused) {
        logger.info("Cluster " + manager.getClusterName() + " is paused. Ignoring the event:" + event.getEventType());
        return;
    }
    NotificationContext context = null;
    if (event.getAttribute(AttributeName.changeContext.name()) != null) {
        context = event.getAttribute(AttributeName.changeContext.name());
    }
    if (context != null) {
        if (context.getType() == Type.FINALIZE) {
            stopRebalancingTimers();
            logger.info("Get FINALIZE notification, skip the pipeline. Event :" + event.getEventType());
            return;
        } else {
            // TODO: should be in the initialization of controller.
            if (_cache != null) {
                checkRebalancingTimer(manager, Collections.EMPTY_LIST, _cache.getClusterConfig());
            }
            if (_isMonitoring) {
                event.addAttribute(AttributeName.clusterStatusMonitor.name(), _clusterStatusMonitor);
            }
        }
    }
    // add the cache
    event.addAttribute(AttributeName.ClusterDataCache.name(), cache);
    List<Pipeline> pipelines = cache.isTaskCache() ? _taskRegistry.getPipelinesForEvent(event.getEventType()) : _registry.getPipelinesForEvent(event.getEventType());
    if (pipelines == null || pipelines.size() == 0) {
        logger.info("No " + getPipelineType(cache.isTaskCache()) + " pipeline to run for event:" + event.getEventType());
        return;
    }
    logger.info(String.format("START: Invoking %s controller pipeline for cluster %s event: %s", manager.getClusterName(), getPipelineType(cache.isTaskCache()), event.getEventType()));
    long startTime = System.currentTimeMillis();
    boolean rebalanceFail = false;
    for (Pipeline pipeline : pipelines) {
        try {
            pipeline.handle(event);
            pipeline.finish();
        } catch (Exception e) {
            logger.error("Exception while executing " + getPipelineType(cache.isTaskCache()) + "pipeline: " + pipeline + "for cluster ." + _clusterName + ". Will not continue to next pipeline", e);
            if (e instanceof HelixMetaDataAccessException) {
                rebalanceFail = true;
                // If pipeline failed due to read/write fails to zookeeper, retry the pipeline.
                cache.requireFullRefresh();
                logger.warn("Rebalance pipeline failed due to read failure from zookeeper, cluster: " + _clusterName);
                // only push a retry event when there is no pending event in the corresponding event queue.
                if (isEventQueueEmpty(cache.isTaskCache())) {
                    _continousRebalanceFailureCount++;
                    long delay = getRetryDelay(_continousRebalanceFailureCount);
                    if (delay == 0) {
                        forceRebalance(manager, ClusterEventType.RetryRebalance);
                    } else {
                        _asyncTasksThreadPool.schedule(new RebalanceTask(manager, ClusterEventType.RetryRebalance), delay, TimeUnit.MILLISECONDS);
                    }
                    logger.info("Retry rebalance pipeline with delay " + delay + "ms for cluster: " + _clusterName);
                }
            }
            _clusterStatusMonitor.reportRebalanceFailure();
            break;
        }
    }
    if (!rebalanceFail) {
        _continousRebalanceFailureCount = 0;
    }
    long endTime = System.currentTimeMillis();
    logger.info(String.format("END: Invoking %s controller pipeline for event: %s for cluster %s, took %d ms", getPipelineType(cache.isTaskCache()), event.getEventType(), manager.getClusterName(), (endTime - startTime)));
    if (!cache.isTaskCache()) {
        // report event process durations
        NotificationContext notificationContext = event.getAttribute(AttributeName.changeContext.name());
        long enqueueTime = event.getCreationTime();
        long zkCallbackTime;
        StringBuilder sb = new StringBuilder();
        if (notificationContext != null) {
            zkCallbackTime = notificationContext.getCreationTime();
            if (_isMonitoring) {
                _clusterStatusMonitor.updateClusterEventDuration(ClusterEventMonitor.PhaseName.Callback.name(), enqueueTime - zkCallbackTime);
            }
            sb.append(String.format("Callback time for event: " + event.getEventType() + " took: " + (enqueueTime - zkCallbackTime) + " ms\n"));
        }
        if (_isMonitoring) {
            _clusterStatusMonitor.updateClusterEventDuration(ClusterEventMonitor.PhaseName.InQueue.name(), startTime - enqueueTime);
            _clusterStatusMonitor.updateClusterEventDuration(ClusterEventMonitor.PhaseName.TotalProcessed.name(), endTime - startTime);
        }
        sb.append(String.format("InQueue time for event: " + event.getEventType() + " took: " + (startTime - enqueueTime) + " ms\n"));
        sb.append(String.format("TotalProcessed time for event: " + event.getEventType() + " took: " + (endTime - startTime) + " ms"));
        logger.info(sb.toString());
    } else if (_isMonitoring) {
        // report workflow status
        TaskDriver driver = new TaskDriver(manager);
        _clusterStatusMonitor.refreshWorkflowsStatus(driver);
        _clusterStatusMonitor.refreshJobsStatus(driver);
    }
    // If event handling happens before controller deactivate, the process may write unnecessary
    // MBeans to monitoring after the monitor is disabled.
    // So reset ClusterStatusMonitor according to it's status after all event handling.
    // TODO remove this once clusterStatusMonitor blocks any MBean register on isMonitoring = false.
    resetClusterStatusMonitor();
}

Example 30 with NotificationContext

use of org.apache.helix.NotificationContext in project helix by apache.

the class TestAsyncCallbackSvc method testAsyncCallbackSvc.

@Test(groups = { "unitTest" })
public void testAsyncCallbackSvc() throws Exception {
    AsyncCallbackService svc = new AsyncCallbackService();
    HelixManager manager = new MockHelixManager();
    NotificationContext changeContext = new NotificationContext(manager);
    Message msg = new Message(svc.getMessageType(), UUID.randomUUID().toString());
    msg.setTgtSessionId(manager.getSessionId());
    try {
        MessageHandler aHandler = svc.createHandler(msg, changeContext);
    } catch (HelixException e) {
        AssertJUnit.assertTrue(e.getMessage().indexOf(msg.getMsgId()) != -1);
    }
    Message msg2 = new Message("RandomType", UUID.randomUUID().toString());
    msg2.setTgtSessionId(manager.getSessionId());
    try {
        MessageHandler aHandler = svc.createHandler(msg2, changeContext);
    } catch (HelixException e) {
        AssertJUnit.assertTrue(e.getMessage().indexOf(msg2.getMsgId()) != -1);
    }
    Message msg3 = new Message(svc.getMessageType(), UUID.randomUUID().toString());
    msg3.setTgtSessionId(manager.getSessionId());
    msg3.setCorrelationId("wfwegw");
    try {
        MessageHandler aHandler = svc.createHandler(msg3, changeContext);
    } catch (HelixException e) {
        AssertJUnit.assertTrue(e.getMessage().indexOf(msg3.getMsgId()) != -1);
    }
    TestAsyncCallback callback = new TestAsyncCallback();
    String corrId = UUID.randomUUID().toString();
    svc.registerAsyncCallback(corrId, new TestAsyncCallback());
    svc.registerAsyncCallback(corrId, callback);
    List<Message> msgSent = new ArrayList<Message>();
    msgSent.add(new Message("Test", UUID.randomUUID().toString()));
    callback.setMessagesSent(msgSent);
    msg = new Message(svc.getMessageType(), UUID.randomUUID().toString());
    msg.setTgtSessionId("*");
    msg.setCorrelationId(corrId);
    MessageHandler aHandler = svc.createHandler(msg, changeContext);
    Map<String, String> resultMap = new HashMap<String, String>();
    aHandler.handleMessage();
    AssertJUnit.assertTrue(callback.isDone());
    AssertJUnit.assertTrue(callback._repliedMessageId.contains(msg.getMsgId()));
}