ResourceTrackerService extends AbstractService implements
    ResourceTracker { @SuppressWarnings("unchecked") @Override public NodeHeartbeatResponse nodeHeartbeat(NodeHeartbeatRequest request) throws YarnException, IOException { NodeStatus remoteNodeStatus = request.getNodeStatus(); NodeId nodeId = remoteNodeStatus.getNodeId(); if (!this.nodesListManager.isValidNode(nodeId.getHost())) { String message = "Disallowed NodeManager nodeId: " + nodeId + " hostname: " + nodeId.getHost(); LOG.info(message); shutDown.setDiagnosticsMessage(message); return shutDown; } RMNode rmNode = this.rmContext.getRMNodes().get(nodeId); if (rmNode == null) { String message = "Node not found resyncing " + remoteNodeStatus.getNodeId(); LOG.info(message); resync.setDiagnosticsMessage(message); return resync; } this.nmLivelinessMonitor.receivedPing(nodeId); NodeHeartbeatResponse lastNodeHeartbeatResponse = rmNode.getLastNodeHeartBeatResponse(); if (remoteNodeStatus.getResponseId() + 1 == lastNodeHeartbeatResponse .getResponseId()) { LOG.info("Received duplicate heartbeat from node " + rmNode.getNodeAddress()+ " responseId=" + remoteNodeStatus.getResponseId()); return lastNodeHeartbeatResponse; } else if (remoteNodeStatus.getResponseId() + 1 < lastNodeHeartbeatResponse .getResponseId()) { String message = "Too far behind rm response id:" + lastNodeHeartbeatResponse.getResponseId() + " nm response id:" + remoteNodeStatus.getResponseId(); LOG.info(message); resync.setDiagnosticsMessage(message); this.rmContext.getDispatcher().getEventHandler().handle( new RMNodeEvent(nodeId, RMNodeEventType.REBOOTING)); return resync; } NodeHeartbeatResponse nodeHeartBeatResponse = YarnServerBuilderUtils .newNodeHeartbeatResponse(lastNodeHeartbeatResponse. getResponseId() + 1, NodeAction.NORMAL, null, null, null, null, nextHeartBeatInterval); rmNode.updateNodeHeartbeatResponseForCleanup(nodeHeartBeatResponse); populateKeys(request, nodeHeartBeatResponse); ConcurrentMap<ApplicationId, ByteBuffer> systemCredentials = rmContext.getSystemCredentialsForApps(); if (!systemCredentials.isEmpty()) { nodeHeartBeatResponse.setSystemCredentialsForApps(systemCredentials); } this.rmContext.getDispatcher().getEventHandler().handle( new RMNodeStatusEvent(nodeId, remoteNodeStatus.getNodeHealthStatus(), remoteNodeStatus.getContainersStatuses(), remoteNodeStatus.getKeepAliveApplications(), nodeHeartBeatResponse)); return nodeHeartBeatResponse; } ResourceTrackerService(RMContext rmContext,
      NodesListManager nodesListManager,
      NMLivelinessMonitor nmLivelinessMonitor,
      RMContainerTokenSecretManager containerTokenSecretManager,
      NMTokenSecretManagerInRM nmTokenSecretManager); @SuppressWarnings("unchecked") @Override RegisterNodeManagerResponse registerNodeManager(
      RegisterNodeManagerRequest request); @SuppressWarnings("unchecked") @Override NodeHeartbeatResponse nodeHeartbeat(NodeHeartbeatRequest request); static Node resolve(String hostName); @VisibleForTesting Server getServer();  }
@Test public void testReconnectNode() throws Exception { final DrainDispatcher dispatcher = new DrainDispatcher(); rm = new MockRM() { @Override protected EventHandler<SchedulerEvent> createSchedulerEventDispatcher() { return new SchedulerEventDispatcher(this.scheduler) { @Override public void handle(SchedulerEvent event) { scheduler.handle(event); } }; } @Override protected Dispatcher createDispatcher() { return dispatcher; } }; rm.start(); MockNM nm1 = rm.registerNode("host1:1234", 5120); MockNM nm2 = rm.registerNode("host2:5678", 5120); nm1.nodeHeartbeat(true); nm2.nodeHeartbeat(false); dispatcher.await(); checkUnealthyNMCount(rm, nm2, true, 1); final int expectedNMs = ClusterMetrics.getMetrics().getNumActiveNMs(); QueueMetrics metrics = rm.getResourceScheduler().getRootQueueMetrics(); Assert.assertEquals(5120, metrics.getAvailableMB()); nm1 = rm.registerNode("host1:1234", 5120); NodeHeartbeatResponse response = nm1.nodeHeartbeat(true); Assert.assertTrue(NodeAction.NORMAL.equals(response.getNodeAction())); dispatcher.await(); Assert.assertEquals(expectedNMs, ClusterMetrics.getMetrics().getNumActiveNMs()); checkUnealthyNMCount(rm, nm2, true, 1); nm2 = rm.registerNode("host2:5678", 5120); response = nm2.nodeHeartbeat(false); Assert.assertTrue(NodeAction.NORMAL.equals(response.getNodeAction())); dispatcher.await(); Assert.assertEquals(expectedNMs, ClusterMetrics.getMetrics().getNumActiveNMs()); checkUnealthyNMCount(rm, nm2, true, 1); nm2 = rm.registerNode("host2:5678", 5120); dispatcher.await(); response = nm2.nodeHeartbeat(true); response = nm2.nodeHeartbeat(true); dispatcher.await(); Assert.assertEquals(5120 + 5120, metrics.getAvailableMB()); nm1 = rm.registerNode("host2:5678", 10240); dispatcher.await(); response = nm1.nodeHeartbeat(true); dispatcher.await(); Assert.assertTrue(NodeAction.NORMAL.equals(response.getNodeAction())); Assert.assertEquals(5120 + 10240, metrics.getAvailableMB()); List<ApplicationId> runningApps = new ArrayList<ApplicationId>(); runningApps.add(ApplicationId.newInstance(1, 0)); nm1 = rm.registerNode("host2:5678", 15360, 2, runningApps); dispatcher.await(); response = nm1.nodeHeartbeat(true); dispatcher.await(); Assert.assertTrue(NodeAction.NORMAL.equals(response.getNodeAction())); Assert.assertEquals(5120 + 15360, metrics.getAvailableMB()); nm1 = new MockNM("host1:1234", 5120, rm.getResourceTrackerService()); nm1.setHttpPort(3); nm1.registerNode(); dispatcher.await(); response = nm1.nodeHeartbeat(true); response = nm1.nodeHeartbeat(true); dispatcher.await(); RMNode rmNode = rm.getRMContext().getRMNodes().get(nm1.getNodeId()); Assert.assertEquals(3, rmNode.getHttpPort()); Assert.assertEquals(5120, rmNode.getTotalCapability().getMemory()); Assert.assertEquals(5120 + 15360, metrics.getAvailableMB()); }