Examples with LauncherUtils org.apache.heron.scheduler.utils.LauncherUtils used on opensource projects

Example 11 with LauncherUtils

use of org.apache.heron.scheduler.utils.LauncherUtils in project heron by twitter.

the class SchedulerMain method runScheduler.

/**
 * Run the scheduler.
 * It is a blocking call, and it will return in 2 cases:
 * 1. The topology is requested to kill
 * 2. Unexpected exceptions happen
 *
 * @return true if scheduled successfully
 */
public boolean runScheduler() {
    IScheduler scheduler = null;
    String statemgrClass = Context.stateManagerClass(config);
    IStateManager statemgr;
    try {
        // create an instance of state manager
        statemgr = ReflectionUtils.newInstance(statemgrClass);
    } catch (IllegalAccessException | InstantiationException | ClassNotFoundException e) {
        LOG.log(Level.SEVERE, "Failed to instantiate instances using config: " + config, e);
        return false;
    }
    SchedulerServer server = null;
    boolean isSuccessful = false;
    // Put it in a try block so that we can always clean resources
    try {
        // initialize the state manager
        statemgr.initialize(config);
        // TODO(mfu): timeout should read from config
        SchedulerStateManagerAdaptor adaptor = new SchedulerStateManagerAdaptor(statemgr, 5000);
        // get a packed plan and schedule it
        PackingPlans.PackingPlan serializedPackingPlan = adaptor.getPackingPlan(topology.getName());
        if (serializedPackingPlan == null) {
            LOG.log(Level.SEVERE, "Failed to fetch PackingPlan for topology:{0} from the state manager", topology.getName());
            return false;
        }
        LOG.log(Level.INFO, "Packing plan fetched from state: {0}", serializedPackingPlan);
        PackingPlan packedPlan = new PackingPlanProtoDeserializer().fromProto(serializedPackingPlan);
        // build the runtime config
        LauncherUtils launcherUtils = LauncherUtils.getInstance();
        Config runtime = Config.newBuilder().putAll(launcherUtils.createPrimaryRuntime(topology)).putAll(launcherUtils.createAdaptorRuntime(adaptor)).put(Key.SCHEDULER_SHUTDOWN, getShutdown()).put(Key.SCHEDULER_PROPERTIES, properties).build();
        Config ytruntime = launcherUtils.createConfigWithPackingDetails(runtime, packedPlan);
        // invoke scheduler
        scheduler = launcherUtils.getSchedulerInstance(config, ytruntime);
        if (scheduler == null) {
            return false;
        }
        isSuccessful = scheduler.onSchedule(packedPlan);
        if (!isSuccessful) {
            LOG.severe("Failed to schedule topology");
            return false;
        }
        // Failures in server initialization throw exceptions
        // get the scheduler server endpoint for receiving requests
        server = getServer(ytruntime, scheduler, schedulerServerPort);
        // start the server to manage runtime requests
        server.start();
        // write the scheduler location to state manager
        // Make sure it happens after IScheduler.onScheduler
        isSuccessful = SchedulerUtils.setSchedulerLocation(runtime, String.format("%s:%d", server.getHost(), server.getPort()), scheduler);
        if (isSuccessful) {
            // wait until kill request or some interrupt occurs if the scheduler starts successfully
            LOG.info("Waiting for termination... ");
            Runtime.schedulerShutdown(ytruntime).await();
        }
    } catch (IOException e) {
        LOG.log(Level.SEVERE, "Failed to start server", e);
        return false;
    } finally {
        // Clean the resources
        if (server != null) {
            server.stop();
        }
        // 4. Close the resources
        SysUtils.closeIgnoringExceptions(scheduler);
        SysUtils.closeIgnoringExceptions(statemgr);
    }
    return isSuccessful;
}