Examples with StageException org.apache.helix.controller.pipeline.StageException used on opensource projects

Example 11 with StageException

use of org.apache.helix.controller.pipeline.StageException in project helix by apache.

the class TaskAssignmentStage method process.

@Override
public void process(ClusterEvent event) throws Exception {
    HelixManager manager = event.getAttribute(AttributeName.helixmanager.name());
    Map<String, Resource> resourceMap = event.getAttribute(AttributeName.RESOURCES_TO_REBALANCE.name());
    MessageThrottleStageOutput messageOutput = event.getAttribute(AttributeName.MESSAGES_THROTTLE.name());
    ClusterDataCache cache = event.getAttribute(AttributeName.ClusterDataCache.name());
    Map<String, LiveInstance> liveInstanceMap = cache.getLiveInstances();
    if (manager == null || resourceMap == null || messageOutput == null || cache == null || liveInstanceMap == null) {
        throw new StageException("Missing attributes in event:" + event + ". Requires HelixManager|RESOURCES|MESSAGES_THROTTLE|DataCache|liveInstanceMap");
    }
    HelixDataAccessor dataAccessor = manager.getHelixDataAccessor();
    List<Message> messagesToSend = new ArrayList<Message>();
    for (String resourceName : resourceMap.keySet()) {
        Resource resource = resourceMap.get(resourceName);
        for (Partition partition : resource.getPartitions()) {
            List<Message> messages = messageOutput.getMessages(resourceName, partition);
            messagesToSend.addAll(messages);
        }
    }
    List<Message> outputMessages = batchMessage(dataAccessor.keyBuilder(), messagesToSend, resourceMap, liveInstanceMap, manager.getProperties());
    sendMessages(dataAccessor, outputMessages);
    // TODO: Need also count messages from task rebalancer
    if (!cache.isTaskCache()) {
        ClusterStatusMonitor clusterStatusMonitor = event.getAttribute(AttributeName.clusterStatusMonitor.name());
        if (clusterStatusMonitor != null) {
            clusterStatusMonitor.increaseMessageReceived(outputMessages);
        }
    }
    long cacheStart = System.currentTimeMillis();
    cache.cacheMessages(outputMessages);
    long cacheEnd = System.currentTimeMillis();
    logger.debug("Caching messages took " + (cacheEnd - cacheStart) + " ms");
}