Package org.apache.hadoop.yarn.server.resourcemanager

Examples of org.apache.hadoop.yarn.server.resourcemanager.Task

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB, 1);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", "b2", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB, 1);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(2 * GB, 1);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    application_0.schedule();
    application_1.schedule();

    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Kick!");
   
    // task_0_0 and task_1_0 allocated, used=4G
    nodeUpdate(nm_0);
   
    // nothing allocated
    nodeUpdate(nm_1);
   
    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(1 * GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available

    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_0,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_1);

    application_1.schedule();

    Task task_0_1 = new Task(application_0, priority_0,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(4 * GB);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    LOG.info("Send resource requests to the scheduler");
    application_0.schedule();
    application_1.schedule();
   
    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Send a heartbeat to kick the tires on the Scheduler... " +
        "nm0 -> task_0_0 and task_1_0 allocated, used=4G " +
        "nm1 -> nothing allocated");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated
   
    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available
   
    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_1,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_1);

    Task task_1_2 = new Task(application_1, priority_1,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_2);

    Task task_1_3 = new Task(application_1, priority_0,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_3);
   
    application_1.schedule();
   
    Task task_0_1 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    Task task_0_2 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_2);
   
    Task task_0_3 = new Task(application_0, priority_0,
        new String[] {ResourceRequest.ANY});
    application_0.addTask(task_0_3);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB, 1);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", "b2", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB, 1);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(2 * GB, 1);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    application_0.schedule();
    application_1.schedule();

    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Kick!");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated

    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(1 * GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available

    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_0,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_1);

    application_1.schedule();

    Task task_0_1 = new Task(application_0, priority_0,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(4 * GB);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    LOG.info("Send resource requests to the scheduler");
    application_0.schedule();
    application_1.schedule();
   
    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Send a heartbeat to kick the tires on the Scheduler... " +
        "nm0 -> task_0_0 and task_1_0 allocated, used=4G " +
        "nm1 -> nothing allocated");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated
   
    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available
   
    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_1,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_1);

    Task task_1_2 = new Task(application_1, priority_1,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_2);

    Task task_1_3 = new Task(application_1, priority_0,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_3);
   
    application_1.schedule();
   
    Task task_0_1 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    Task task_0_2 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_2);
   
    Task task_0_3 = new Task(application_0, priority_0,
        new String[] {ResourceRequest.ANY});
    application_0.addTask(task_0_3);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(4 * GB);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    LOG.info("Send resource requests to the scheduler");
    application_0.schedule();
    application_1.schedule();
   
    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Send a heartbeat to kick the tires on the Scheduler... " +
        "nm0 -> task_0_0 and task_1_0 allocated, used=4G " +
        "nm1 -> nothing allocated");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated
   
    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available
   
    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_1,
        new String[] {RMNode.ANY});
    application_1.addTask(task_1_1);

    Task task_1_2 = new Task(application_1, priority_1,
        new String[] {RMNode.ANY});
    application_1.addTask(task_1_2);

    Task task_1_3 = new Task(application_1, priority_0,
        new String[] {RMNode.ANY});
    application_1.addTask(task_1_3);
   
    application_1.schedule();
   
    Task task_0_1 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    Task task_0_2 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_2);
   
    Task task_0_3 = new Task(application_0, priority_0,
        new String[] {RMNode.ANY});
    application_0.addTask(task_0_3);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", "b2", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(2 * GB);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    application_0.schedule();
    application_1.schedule();

    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Kick!");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated

    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(1 * GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available

    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_0,
        new String[] {RMNode.ANY});
    application_1.addTask(task_1_1);

    application_1.schedule();

    Task task_0_1 = new Task(application_0, priority_0,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(4 * GB);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    LOG.info("Send resource requests to the scheduler");
    application_0.schedule();
    application_1.schedule();
   
    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Send a heartbeat to kick the tires on the Scheduler... " +
        "nm0 -> task_0_0 and task_1_0 allocated, used=4G " +
        "nm1 -> nothing allocated");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated
   
    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available
   
    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_1,
        new String[] {RMNode.ANY});
    application_1.addTask(task_1_1);

    Task task_1_2 = new Task(application_1, priority_1,
        new String[] {RMNode.ANY});
    application_1.addTask(task_1_2);

    Task task_1_3 = new Task(application_1, priority_0,
        new String[] {RMNode.ANY});
    application_1.addTask(task_1_3);
   
    application_1.schedule();
   
    Task task_0_1 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    Task task_0_2 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_2);
   
    Task task_0_3 = new Task(application_0, priority_0,
        new String[] {RMNode.ANY});
    application_0.addTask(task_0_3);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", "b2", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(2 * GB);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    application_0.schedule();
    application_1.schedule();

    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Kick!");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated

    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(1 * GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available

    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_0,
        new String[] {RMNode.ANY});
    application_1.addTask(task_1_1);

    application_1.schedule();

    Task task_0_1 = new Task(application_0, priority_0,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(4 * GB);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    LOG.info("Send resource requests to the scheduler");
    application_0.schedule();
    application_1.schedule();
   
    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Send a heartbeat to kick the tires on the Scheduler... " +
        "nm0 -> task_0_0 and task_1_0 allocated, used=4G " +
        "nm1 -> nothing allocated");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated
   
    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available
   
    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_1,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_1);

    Task task_1_2 = new Task(application_1, priority_1,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_2);

    Task task_1_3 = new Task(application_1, priority_0,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_3);
   
    application_1.schedule();
   
    Task task_0_1 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    Task task_0_2 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_2);
   
    Task task_0_3 = new Task(application_0, priority_0,
        new String[] {ResourceRequest.ANY});
    application_0.addTask(task_0_3);

    application_0.schedule();

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    application_0.addResourceRequestSpec(priority_1, capability_0_0);
   
    Resource capability_0_1 = Resources.createResource(2 * GB, 1);
    application_0.addResourceRequestSpec(priority_0, capability_0_1);

    Task task_0_0 = new Task(application_0, priority_1,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_0);
      
    // Submit another application
    Application application_1 = new Application("user_1", "b2", resourceManager);
    application_1.submit();
   
    application_1.addNodeManager(host_0, 1234, nm_0);
    application_1.addNodeManager(host_1, 1234, nm_1);
   
    Resource capability_1_0 = Resources.createResource(3 * GB, 1);
    application_1.addResourceRequestSpec(priority_1, capability_1_0);
   
    Resource capability_1_1 = Resources.createResource(2 * GB, 1);
    application_1.addResourceRequestSpec(priority_0, capability_1_1);

    Task task_1_0 = new Task(application_1, priority_1,
        new String[] {host_0, host_1});
    application_1.addTask(task_1_0);
       
    // Send resource requests to the scheduler
    application_0.schedule();
    application_1.schedule();

    // Send a heartbeat to kick the tires on the Scheduler
    LOG.info("Kick!");
    nm_0.heartbeat();             // task_0_0 and task_1_0 allocated, used=4G
    nm_1.heartbeat();             // nothing allocated

    // Get allocations from the scheduler
    application_0.schedule();     // task_0_0
    checkApplicationResourceUsage(1 * GB, application_0);

    application_1.schedule();     // task_1_0
    checkApplicationResourceUsage(3 * GB, application_1);
   
    nm_0.heartbeat();
    nm_1.heartbeat();
   
    checkNodeResourceUsage(4*GB, nm_0);  // task_0_0 (1G) and task_1_0 (3G)
    checkNodeResourceUsage(0*GB, nm_1);  // no tasks, 2G available

    LOG.info("Adding new tasks...");
   
    Task task_1_1 = new Task(application_1, priority_0,
        new String[] {ResourceRequest.ANY});
    application_1.addTask(task_1_1);

    application_1.schedule();

    Task task_0_1 = new Task(application_0, priority_0,
        new String[] {host_0, host_1});
    application_0.addTask(task_0_1);

    application_0.schedule();

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