| // Copyright 2012 Citrix Systems, Inc. Licensed under the |
| // Apache License, Version 2.0 (the "License"); you may not use this |
| // file except in compliance with the License. Citrix Systems, Inc. |
| // reserves all rights not expressly granted by the License. |
| // You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| // Automatically generated by addcopyright.py at 04/03/2012 |
| package com.cloud.agent.manager;
|
|
|
| import java.io.IOException;
|
| import java.net.InetAddress;
|
| import java.net.InetSocketAddress;
|
| import java.net.UnknownHostException;
|
| import java.nio.ByteBuffer;
|
| import java.nio.channels.SocketChannel;
|
| import java.util.ArrayList;
|
| import java.util.Date;
|
| import java.util.HashMap;
|
| import java.util.HashSet;
|
| import java.util.Iterator;
|
| import java.util.List;
|
| import java.util.Map;
|
| import java.util.Set;
|
| import java.util.Timer;
|
| import java.util.TimerTask;
|
| import java.util.concurrent.Executors;
|
| import java.util.concurrent.RejectedExecutionException;
|
| import java.util.concurrent.ScheduledExecutorService;
|
| import java.util.concurrent.TimeUnit;
|
|
|
| import javax.ejb.Local;
|
| import javax.naming.ConfigurationException;
|
| import javax.net.ssl.SSLContext;
|
| import javax.net.ssl.SSLEngine;
|
|
|
| import org.apache.log4j.Logger;
|
|
|
| import com.cloud.agent.AgentManager;
|
| import com.cloud.agent.api.Answer;
|
| import com.cloud.agent.api.CancelCommand;
|
| import com.cloud.agent.api.ChangeAgentCommand;
|
| import com.cloud.agent.api.Command;
|
| import com.cloud.agent.api.TransferAgentCommand;
|
| import com.cloud.agent.transport.Request;
|
| import com.cloud.agent.transport.Request.Version;
|
| import com.cloud.agent.transport.Response;
|
| import com.cloud.cluster.ClusterManager;
|
| import com.cloud.cluster.ClusterManagerListener;
|
| import com.cloud.cluster.ClusteredAgentRebalanceService;
|
| import com.cloud.cluster.ManagementServerHost;
|
| import com.cloud.cluster.ManagementServerHostVO;
|
| import com.cloud.cluster.StackMaid;
|
| import com.cloud.cluster.agentlb.AgentLoadBalancerPlanner;
|
| import com.cloud.cluster.agentlb.HostTransferMapVO;
|
| import com.cloud.cluster.agentlb.HostTransferMapVO.HostTransferState;
|
| import com.cloud.cluster.agentlb.dao.HostTransferMapDao;
|
| import com.cloud.cluster.dao.ManagementServerHostDao;
|
| import com.cloud.configuration.Config;
|
| import com.cloud.configuration.dao.ConfigurationDao;
|
| import com.cloud.exception.AgentUnavailableException;
|
| import com.cloud.exception.OperationTimedoutException;
|
| import com.cloud.host.Host;
|
| import com.cloud.host.HostVO;
|
| import com.cloud.host.Status;
|
| import com.cloud.host.Status.Event;
|
| import com.cloud.resource.ServerResource;
|
| import com.cloud.storage.resource.DummySecondaryStorageResource;
|
| import com.cloud.utils.DateUtil;
|
| import com.cloud.utils.NumbersUtil;
|
| import com.cloud.utils.component.Adapters;
|
| import com.cloud.utils.component.ComponentLocator;
|
| import com.cloud.utils.component.Inject;
|
| import com.cloud.utils.concurrency.NamedThreadFactory;
|
| import com.cloud.utils.db.SearchCriteria.Op;
|
| import com.cloud.utils.db.SearchCriteria2;
|
| import com.cloud.utils.db.SearchCriteriaService;
|
| import com.cloud.utils.db.Transaction;
|
| import com.cloud.utils.exception.CloudRuntimeException;
|
| import com.cloud.utils.nio.Link;
|
| import com.cloud.utils.nio.Task;
|
|
|
| @Local(value = { AgentManager.class, ClusteredAgentRebalanceService.class })
|
| public class ClusteredAgentManagerImpl extends AgentManagerImpl implements ClusterManagerListener, ClusteredAgentRebalanceService {
|
| final static Logger s_logger = Logger.getLogger(ClusteredAgentManagerImpl.class);
|
| private static final ScheduledExecutorService s_transferExecutor = Executors.newScheduledThreadPool(1, new NamedThreadFactory("Cluster-AgentTransferExecutor"));
|
| private final long rebalanceTimeOut = 300000; // 5 mins - after this time remove the agent from the transfer list
|
|
|
| public final static long STARTUP_DELAY = 5000;
|
| public final static long SCAN_INTERVAL = 90000; // 90 seconds, it takes 60 sec for xenserver to fail login
|
| public final static int ACQUIRE_GLOBAL_LOCK_TIMEOUT_FOR_COOPERATION = 5; // 5 seconds
|
| public long _loadSize = 100;
|
| protected Set<Long> _agentToTransferIds = new HashSet<Long>();
|
|
|
| @Inject
|
| protected ClusterManager _clusterMgr = null;
|
|
|
| protected HashMap<String, SocketChannel> _peers;
|
| protected HashMap<String, SSLEngine> _sslEngines;
|
| private final Timer _timer = new Timer("ClusteredAgentManager Timer");
|
|
|
| @Inject
|
| protected ManagementServerHostDao _mshostDao;
|
| @Inject
|
| protected HostTransferMapDao _hostTransferDao;
|
|
|
| @Inject(adapter = AgentLoadBalancerPlanner.class)
|
| protected Adapters<AgentLoadBalancerPlanner> _lbPlanners;
|
|
|
| @Inject
|
| protected AgentManager _agentMgr;
|
|
|
| protected ClusteredAgentManagerImpl() {
|
| super();
|
| }
|
|
|
| @Override
|
| public boolean configure(String name, Map<String, Object> xmlParams) throws ConfigurationException {
|
| _peers = new HashMap<String, SocketChannel>(7);
|
| _sslEngines = new HashMap<String, SSLEngine>(7);
|
| _nodeId = _clusterMgr.getManagementNodeId();
|
|
|
| s_logger.info("Configuring ClusterAgentManagerImpl. management server node id(msid): " + _nodeId);
|
|
|
| ConfigurationDao configDao = ComponentLocator.getCurrentLocator().getDao(ConfigurationDao.class);
|
| Map<String, String> params = configDao.getConfiguration(xmlParams);
|
| String value = params.get(Config.DirectAgentLoadSize.key());
|
| _loadSize = NumbersUtil.parseInt(value, 16);
|
|
|
| ClusteredAgentAttache.initialize(this);
|
|
|
| _clusterMgr.registerListener(this);
|
|
|
| return super.configure(name, xmlParams);
|
| }
|
|
|
| @Override
|
| public boolean start() {
|
| if (!super.start()) {
|
| return false;
|
| }
|
| _timer.schedule(new DirectAgentScanTimerTask(), STARTUP_DELAY, SCAN_INTERVAL);
|
|
|
| // schedule transfer scan executor - if agent LB is enabled
|
| if (_clusterMgr.isAgentRebalanceEnabled()) {
|
| s_transferExecutor.scheduleAtFixedRate(getTransferScanTask(), 60000, ClusteredAgentRebalanceService.DEFAULT_TRANSFER_CHECK_INTERVAL,
|
| TimeUnit.MILLISECONDS);
|
| }
|
|
|
| return true;
|
| }
|
|
|
| private void runDirectAgentScanTimerTask() {
|
| scanDirectAgentToLoad();
|
| }
|
|
|
| private void scanDirectAgentToLoad() {
|
| if (s_logger.isTraceEnabled()) {
|
| s_logger.trace("Begin scanning directly connected hosts");
|
| }
|
|
|
| // for agents that are self-managed, threshold to be considered as disconnected is 3 ping intervals
|
| long cutSeconds = (System.currentTimeMillis() >> 10) - (_pingInterval * 3);
|
| List<HostVO> hosts = _hostDao.findAndUpdateDirectAgentToLoad(cutSeconds, _loadSize, _nodeId);
|
| List<HostVO> appliances = _hostDao.findAndUpdateApplianceToLoad(cutSeconds, _nodeId);
|
| hosts.addAll(appliances);
|
|
|
| if (hosts != null && hosts.size() > 0) {
|
| s_logger.debug("Found " + hosts.size() + " unmanaged direct hosts, processing connect for them...");
|
| for (HostVO host : hosts) {
|
| try {
|
| AgentAttache agentattache = findAttache(host.getId());
|
| if (agentattache != null) {
|
| // already loaded, skip
|
| if (agentattache.forForward()) {
|
| if (s_logger.isInfoEnabled()) {
|
| s_logger.info(host + " is detected down, but we have a forward attache running, disconnect this one before launching the host");
|
| }
|
| removeAgent(agentattache, Status.Disconnected);
|
| } else {
|
| continue;
|
| }
|
| }
|
|
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("Loading directly connected host " + host.getId() + "(" + host.getName() + ")");
|
| }
|
| loadDirectlyConnectedHost(host, false);
|
| } catch (Throwable e) {
|
| s_logger.warn(" can not load directly connected host " + host.getId() + "(" + host.getName() + ") due to ",e);
|
| }
|
| }
|
| }
|
|
|
| if (s_logger.isTraceEnabled()) {
|
| s_logger.trace("End scanning directly connected hosts");
|
| }
|
| }
|
|
|
| private class DirectAgentScanTimerTask extends TimerTask {
|
| @Override
|
| public void run() {
|
| try {
|
| runDirectAgentScanTimerTask();
|
| } catch (Throwable e) {
|
| s_logger.error("Unexpected exception " + e.getMessage(), e);
|
| }
|
| }
|
| }
|
|
|
| @Override
|
| public Task create(Task.Type type, Link link, byte[] data) {
|
| return new ClusteredAgentHandler(type, link, data);
|
| }
|
|
|
| protected AgentAttache createAttache(long id) {
|
| s_logger.debug("create forwarding ClusteredAgentAttache for " + id);
|
| final AgentAttache attache = new ClusteredAgentAttache(this, id);
|
| AgentAttache old = null;
|
| synchronized (_agents) {
|
| old = _agents.get(id);
|
| _agents.put(id, attache);
|
| }
|
| if (old != null) {
|
| old.disconnect(Status.Removed);
|
| }
|
| return attache;
|
| }
|
|
|
| @Override
|
| protected AgentAttache createAttacheForConnect(HostVO host, Link link) {
|
| s_logger.debug("create ClusteredAgentAttache for " + host.getId());
|
| final AgentAttache attache = new ClusteredAgentAttache(this, host.getId(), link, host.isInMaintenanceStates());
|
| link.attach(attache);
|
| AgentAttache old = null;
|
| synchronized (_agents) {
|
| old = _agents.get(host.getId());
|
| _agents.put(host.getId(), attache);
|
| }
|
| if (old != null) {
|
| old.disconnect(Status.Removed);
|
| }
|
| return attache;
|
| }
|
|
|
| @Override
|
| protected AgentAttache createAttacheForDirectConnect(HostVO host, ServerResource resource) {
|
| if (resource instanceof DummySecondaryStorageResource) {
|
| return new DummyAttache(this, host.getId(), false);
|
| }
|
| s_logger.debug("create ClusteredDirectAgentAttache for " + host.getId());
|
| final DirectAgentAttache attache = new ClusteredDirectAgentAttache(this, host.getId(), _nodeId, resource, host.isInMaintenanceStates(), this);
|
| AgentAttache old = null;
|
| synchronized (_agents) {
|
| old = _agents.get(host.getId());
|
| _agents.put(host.getId(), attache);
|
| }
|
| if (old != null) {
|
| old.disconnect(Status.Removed);
|
| }
|
| return attache;
|
| }
|
|
|
| @Override
|
| protected boolean handleDisconnectWithoutInvestigation(AgentAttache attache, Status.Event event) {
|
| return handleDisconnect(attache, event, false, true);
|
| }
|
|
|
| @Override
|
| protected boolean handleDisconnectWithInvestigation(AgentAttache attache, Status.Event event) {
|
| return handleDisconnect(attache, event, true, true);
|
| }
|
|
|
| protected boolean handleDisconnect(AgentAttache agent, Status.Event event, boolean investigate, boolean broadcast) {
|
| boolean res;
|
| if (!investigate) {
|
| res = super.handleDisconnectWithoutInvestigation(agent, event);
|
| } else {
|
| res = super.handleDisconnectWithInvestigation(agent, event);
|
| }
|
|
|
| if (res) {
|
| if (broadcast) {
|
| notifyNodesInCluster(agent);
|
| }
|
| return true;
|
| } else {
|
| return false;
|
| }
|
| }
|
|
|
| @Override
|
| public boolean executeUserRequest(long hostId, Event event) throws AgentUnavailableException {
|
| if (event == Event.AgentDisconnected) {
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("Received agent disconnect event for host " + hostId);
|
| }
|
| AgentAttache attache = findAttache(hostId);
|
| if (attache != null) {
|
| handleDisconnect(attache, Event.AgentDisconnected, false, false);
|
| }
|
|
|
| return true;
|
| } else {
|
| return super.executeUserRequest(hostId, event);
|
| }
|
| }
|
|
|
| @Override
|
| public boolean reconnect(final long hostId) {
|
| Boolean result;
|
| try {
|
| result = _clusterMgr.propagateAgentEvent(hostId, Event.ShutdownRequested);
|
| if (result != null) {
|
| return result;
|
| }
|
| } catch (AgentUnavailableException e) {
|
| s_logger.debug("cannot propagate agent reconnect because agent is not available", e);
|
| return false;
|
| }
|
|
|
| return super.reconnect(hostId);
|
| }
|
|
|
| public void notifyNodesInCluster(AgentAttache attache) {
|
| s_logger.debug("Notifying other nodes of to disconnect");
|
| Command[] cmds = new Command[] { new ChangeAgentCommand(attache.getId(), Event.AgentDisconnected) };
|
| _clusterMgr.broadcast(attache.getId(), cmds);
|
| }
|
|
|
| protected static void logT(byte[] bytes, final String msg) {
|
| s_logger.trace("Seq " + Request.getAgentId(bytes) + "-" + Request.getSequence(bytes) + ": MgmtId " + Request.getManagementServerId(bytes) + ": "
|
| + (Request.isRequest(bytes) ? "Req: " : "Resp: ") + msg);
|
| }
|
|
|
| protected static void logD(byte[] bytes, final String msg) {
|
| s_logger.debug("Seq " + Request.getAgentId(bytes) + "-" + Request.getSequence(bytes) + ": MgmtId " + Request.getManagementServerId(bytes) + ": "
|
| + (Request.isRequest(bytes) ? "Req: " : "Resp: ") + msg);
|
| }
|
|
|
| protected static void logI(byte[] bytes, final String msg) {
|
| s_logger.info("Seq " + Request.getAgentId(bytes) + "-" + Request.getSequence(bytes) + ": MgmtId " + Request.getManagementServerId(bytes) + ": "
|
| + (Request.isRequest(bytes) ? "Req: " : "Resp: ") + msg);
|
| }
|
|
|
| public boolean routeToPeer(String peer, byte[] bytes) {
|
| int i = 0;
|
| SocketChannel ch = null;
|
| SSLEngine sslEngine = null;
|
| while (i++ < 5) {
|
| ch = connectToPeer(peer, ch);
|
| if (ch == null) {
|
| try {
|
| logD(bytes, "Unable to route to peer: " + Request.parse(bytes).toString());
|
| } catch (Exception e) {
|
| }
|
| return false;
|
| }
|
| sslEngine = getSSLEngine(peer);
|
| if (sslEngine == null) {
|
| logD(bytes, "Unable to get SSLEngine of peer: " + peer);
|
| return false;
|
| }
|
| try {
|
| if (s_logger.isDebugEnabled()) {
|
| logD(bytes, "Routing to peer");
|
| }
|
| Link.write(ch, new ByteBuffer[] { ByteBuffer.wrap(bytes) }, sslEngine);
|
| return true;
|
| } catch (IOException e) {
|
| try {
|
| logI(bytes, "Unable to route to peer: " + Request.parse(bytes).toString() + " due to " + e.getMessage());
|
| } catch (Exception ex) {
|
| }
|
| }
|
| }
|
| return false;
|
| }
|
|
|
| public String findPeer(long hostId) {
|
| return _clusterMgr.getPeerName(hostId);
|
| }
|
|
|
| public SSLEngine getSSLEngine(String peerName) {
|
| return _sslEngines.get(peerName);
|
| }
|
|
|
| public void cancel(String peerName, long hostId, long sequence, String reason) {
|
| CancelCommand cancel = new CancelCommand(sequence, reason);
|
| Request req = new Request(hostId, _nodeId, cancel, true);
|
| req.setControl(true);
|
| routeToPeer(peerName, req.getBytes());
|
| }
|
|
|
| public void closePeer(String peerName) {
|
| synchronized (_peers) {
|
| SocketChannel ch = _peers.get(peerName);
|
| if (ch != null) {
|
| try {
|
| ch.close();
|
| } catch (IOException e) {
|
| s_logger.warn("Unable to close peer socket connection to " + peerName);
|
| }
|
| }
|
| _peers.remove(peerName);
|
| _sslEngines.remove(peerName);
|
| }
|
| }
|
|
|
| public SocketChannel connectToPeer(String peerName, SocketChannel prevCh) {
|
| synchronized (_peers) {
|
| SocketChannel ch = _peers.get(peerName);
|
| SSLEngine sslEngine = null;
|
| if (prevCh != null) {
|
| try {
|
| prevCh.close();
|
| } catch (Exception e) {
|
| }
|
| }
|
| if (ch == null || ch == prevCh) {
|
| ManagementServerHostVO ms = _clusterMgr.getPeer(peerName);
|
| if (ms == null) {
|
| s_logger.info("Unable to find peer: " + peerName);
|
| return null;
|
| }
|
| String ip = ms.getServiceIP();
|
| InetAddress addr;
|
| try {
|
| addr = InetAddress.getByName(ip);
|
| } catch (UnknownHostException e) {
|
| throw new CloudRuntimeException("Unable to resolve " + ip);
|
| }
|
| try {
|
| ch = SocketChannel.open(new InetSocketAddress(addr, _port));
|
| ch.configureBlocking(true); // make sure we are working at blocking mode
|
| ch.socket().setKeepAlive(true);
|
| ch.socket().setSoTimeout(60 * 1000);
|
| try { |
| SSLContext sslContext = Link.initSSLContext(true); |
| sslEngine = sslContext.createSSLEngine(ip, _port); |
| sslEngine.setUseClientMode(true); |
| |
| Link.doHandshake(ch, sslEngine, true); |
| s_logger.info("SSL: Handshake done"); |
| } catch (Exception e) { |
| throw new IOException("SSL: Fail to init SSL! " + e); |
| } |
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("Connection to peer opened: " + peerName + ", ip: " + ip);
|
| }
|
| _peers.put(peerName, ch);
|
| _sslEngines.put(peerName, sslEngine);
|
| } catch (IOException e) {
|
| s_logger.warn("Unable to connect to peer management server: " + peerName + ", ip: " + ip + " due to " + e.getMessage(), e);
|
| return null;
|
| }
|
| }
|
|
|
| if (s_logger.isTraceEnabled()) {
|
| s_logger.trace("Found open channel for peer: " + peerName);
|
| }
|
| return ch;
|
| }
|
| }
|
|
|
| public SocketChannel connectToPeer(long hostId, SocketChannel prevCh) {
|
| String peerName = _clusterMgr.getPeerName(hostId);
|
| if (peerName == null) {
|
| return null;
|
| }
|
|
|
| return connectToPeer(peerName, prevCh);
|
| }
|
|
|
| @Override
|
| protected AgentAttache getAttache(final Long hostId) throws AgentUnavailableException {
|
| assert (hostId != null) : "Who didn't check their id value?";
|
| HostVO host = _hostDao.findById(hostId);
|
| if (host == null) {
|
| throw new AgentUnavailableException("Can't find the host ", hostId);
|
| }
|
|
|
| AgentAttache agent = findAttache(hostId);
|
| if (agent == null) {
|
| if (host.getStatus() == Status.Up && (host.getManagementServerId() != null && host.getManagementServerId() != _nodeId)) {
|
| agent = createAttache(hostId);
|
| }
|
| }
|
| if (agent == null) {
|
| throw new AgentUnavailableException("Host is not in the right state: " + host.getStatus() , hostId);
|
| }
|
|
|
| return agent;
|
| }
|
|
|
| @Override
|
| public boolean stop() {
|
| if (_peers != null) {
|
| for (SocketChannel ch : _peers.values()) {
|
| try {
|
| s_logger.info("Closing: " + ch.toString());
|
| ch.close();
|
| } catch (IOException e) {
|
| }
|
| }
|
| }
|
| _timer.cancel();
|
|
|
| //cancel all transfer tasks
|
| s_transferExecutor.shutdownNow();
|
| cleanupTransferMap(_nodeId);
|
|
|
| return super.stop();
|
| }
|
|
|
| @Override
|
| public void startDirectlyConnectedHosts() {
|
| // override and let it be dummy for purpose, we will scan and load direct agents periodically.
|
| // We may also pickup agents that have been left over from other crashed management server
|
| }
|
|
|
| public class ClusteredAgentHandler extends AgentHandler {
|
|
|
| public ClusteredAgentHandler(Task.Type type, Link link, byte[] data) {
|
| super(type, link, data);
|
| }
|
|
|
| @Override
|
| protected void doTask(final Task task) throws Exception {
|
| Transaction txn = Transaction.open(Transaction.CLOUD_DB);
|
| try {
|
| if (task.getType() != Task.Type.DATA) {
|
| super.doTask(task);
|
| return;
|
| }
|
|
|
| final byte[] data = task.getData();
|
| Version ver = Request.getVersion(data);
|
| if (ver.ordinal() != Version.v1.ordinal() && ver.ordinal() != Version.v3.ordinal()) {
|
| s_logger.warn("Wrong version for clustered agent request");
|
| super.doTask(task);
|
| return;
|
| }
|
|
|
| long hostId = Request.getAgentId(data);
|
| Link link = task.getLink();
|
|
|
| if (Request.fromServer(data)) {
|
|
|
| AgentAttache agent = findAttache(hostId);
|
|
|
| if (Request.isControl(data)) {
|
| if (agent == null) {
|
| logD(data, "No attache to process cancellation");
|
| return;
|
| }
|
| Request req = Request.parse(data);
|
| Command[] cmds = req.getCommands();
|
| CancelCommand cancel = (CancelCommand) cmds[0];
|
| if (s_logger.isDebugEnabled()) {
|
| logD(data, "Cancel request received");
|
| }
|
| agent.cancel(cancel.getSequence());
|
| return;
|
| }
|
|
|
| try {
|
| if (agent == null || agent.isClosed()) {
|
| throw new AgentUnavailableException("Unable to route to agent ", hostId);
|
| }
|
|
|
| if (Request.isRequest(data) && Request.requiresSequentialExecution(data)) {
|
| // route it to the agent.
|
| // But we have the serialize the control commands here so we have
|
| // to deserialize this and send it through the agent attache.
|
| Request req = Request.parse(data);
|
| agent.send(req, null);
|
| return;
|
| } else {
|
| if (agent instanceof Routable) {
|
| Routable cluster = (Routable) agent;
|
| cluster.routeToAgent(data);
|
| } else {
|
| agent.send(Request.parse(data));
|
| }
|
| return;
|
| }
|
| } catch (AgentUnavailableException e) {
|
| logD(data, e.getMessage());
|
| cancel(Long.toString(Request.getManagementServerId(data)), hostId, Request.getSequence(data), e.getMessage());
|
| }
|
| } else {
|
|
|
| long mgmtId = Request.getManagementServerId(data);
|
| if (mgmtId != -1 && mgmtId != _nodeId) {
|
| routeToPeer(Long.toString(mgmtId), data);
|
| if (Request.requiresSequentialExecution(data)) {
|
| AgentAttache attache = (AgentAttache) link.attachment();
|
| if (attache != null) {
|
| attache.sendNext(Request.getSequence(data));
|
| } else if (s_logger.isDebugEnabled()) {
|
| logD(data, "No attache to process " + Request.parse(data).toString());
|
| }
|
| }
|
| return;
|
| } else {
|
| if (Request.isRequest(data)) {
|
| super.doTask(task);
|
| } else {
|
| // received an answer.
|
| final Response response = Response.parse(data);
|
| AgentAttache attache = findAttache(response.getAgentId());
|
| if (attache == null) {
|
| s_logger.info("SeqA " + response.getAgentId() + "-" + response.getSequence() + "Unable to find attache to forward " + response.toString());
|
| return;
|
| }
|
| if (!attache.processAnswers(response.getSequence(), response)) {
|
| s_logger.info("SeqA " + attache.getId() + "-" + response.getSequence() + ": Response is not processed: " + response.toString());
|
| }
|
| }
|
| return;
|
| }
|
| }
|
| } finally {
|
| txn.close();
|
| }
|
| }
|
| }
|
|
|
| @Override
|
| public void onManagementNodeJoined(List<ManagementServerHostVO> nodeList, long selfNodeId) {
|
| }
|
|
|
| @Override
|
| public void onManagementNodeLeft(List<ManagementServerHostVO> nodeList, long selfNodeId) {
|
| for (ManagementServerHostVO vo : nodeList) {
|
| s_logger.info("Marking hosts as disconnected on Management server" + vo.getMsid());
|
| long lastPing = (System.currentTimeMillis() >> 10) - _pingTimeout;
|
| _hostDao.markHostsAsDisconnected(vo.getMsid(), lastPing);
|
| s_logger.info("Deleting entries from op_host_transfer table for Management server " + vo.getMsid());
|
| cleanupTransferMap(vo.getMsid());
|
| }
|
| }
|
|
|
| @Override
|
| public void onManagementNodeIsolated() {
|
| }
|
|
|
| @Override
|
| public void removeAgent(AgentAttache attache, Status nextState) {
|
| if (attache == null) {
|
| return;
|
| }
|
|
|
| super.removeAgent(attache, nextState);
|
| }
|
|
|
| @Override
|
| public boolean executeRebalanceRequest(long agentId, long currentOwnerId, long futureOwnerId, Event event) throws AgentUnavailableException, OperationTimedoutException {
|
| boolean result = false;
|
| if (event == Event.RequestAgentRebalance) {
|
| return setToWaitForRebalance(agentId, currentOwnerId, futureOwnerId);
|
| } else if (event == Event.StartAgentRebalance) {
|
| try {
|
| result = rebalanceHost(agentId, currentOwnerId, futureOwnerId);
|
| } catch (Exception e) {
|
| s_logger.warn("Unable to rebalance host id=" + agentId, e);
|
| }
|
| }
|
| return result;
|
| }
|
|
|
| @Override
|
| public void scheduleRebalanceAgents() {
|
| _timer.schedule(new AgentLoadBalancerTask(), 30000);
|
| }
|
|
|
| public class AgentLoadBalancerTask extends TimerTask {
|
| protected volatile boolean cancelled = false;
|
|
|
| public AgentLoadBalancerTask() {
|
| s_logger.debug("Agent load balancer task created");
|
| }
|
|
|
| @Override
|
| public synchronized boolean cancel() {
|
| if (!cancelled) {
|
| cancelled = true;
|
| s_logger.debug("Agent load balancer task cancelled");
|
| return super.cancel();
|
| }
|
| return true;
|
| }
|
|
|
| @Override
|
| public synchronized void run() {
|
| try {
|
| if (!cancelled) {
|
| startRebalanceAgents();
|
| if (s_logger.isInfoEnabled()) {
|
| s_logger.info("The agent load balancer task is now being cancelled");
|
| }
|
| cancelled = true;
|
| }
|
| } catch(Throwable e) {
|
| s_logger.error("Unexpected exception " + e.toString(), e);
|
| }
|
| }
|
| }
|
|
|
| public void startRebalanceAgents() {
|
| s_logger.debug("Management server " + _nodeId + " is asking other peers to rebalance their agents");
|
| List<ManagementServerHostVO> allMS = _mshostDao.listBy(ManagementServerHost.State.Up);
|
| SearchCriteriaService<HostVO, HostVO> sc = SearchCriteria2.create(HostVO.class);
|
| sc.addAnd(sc.getEntity().getManagementServerId(), Op.NNULL);
|
| sc.addAnd(sc.getEntity().getType(), Op.EQ, Host.Type.Routing);
|
| List<HostVO> allManagedAgents = sc.list();
|
|
|
| int avLoad = 0;
|
|
|
| if (!allManagedAgents.isEmpty() && !allMS.isEmpty()) {
|
| avLoad = allManagedAgents.size() / allMS.size();
|
| } else {
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("There are no hosts to rebalance in the system. Current number of active management server nodes in the system is " + allMS.size() + "; number of managed agents is " + allManagedAgents.size());
|
| }
|
| return;
|
| }
|
|
|
| if (avLoad == 0L) {
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("As calculated average load is less than 1, rounding it to 1");
|
| }
|
| avLoad = 1;
|
| }
|
|
|
| for (ManagementServerHostVO node : allMS) {
|
| if (node.getMsid() != _nodeId) {
|
|
|
| List<HostVO> hostsToRebalance = new ArrayList<HostVO>();
|
| for (AgentLoadBalancerPlanner lbPlanner : _lbPlanners) {
|
| hostsToRebalance = lbPlanner.getHostsToRebalance(node.getMsid(), avLoad);
|
| if (hostsToRebalance != null && !hostsToRebalance.isEmpty()) {
|
| break;
|
| } else {
|
| s_logger.debug("Agent load balancer planner " + lbPlanner.getName() + " found no hosts to be rebalanced from management server " + node.getMsid());
|
| }
|
| }
|
|
|
|
|
| if (hostsToRebalance != null && !hostsToRebalance.isEmpty()) {
|
| s_logger.debug("Found " + hostsToRebalance.size() + " hosts to rebalance from management server " + node.getMsid());
|
| for (HostVO host : hostsToRebalance) {
|
| long hostId = host.getId();
|
| s_logger.debug("Asking management server " + node.getMsid() + " to give away host id=" + hostId);
|
| boolean result = true;
|
|
|
| if (_hostTransferDao.findById(hostId) != null) {
|
| s_logger.warn("Somebody else is already rebalancing host id: " + hostId);
|
| continue;
|
| }
|
|
|
| HostTransferMapVO transfer = null;
|
| try {
|
| transfer = _hostTransferDao.startAgentTransfering(hostId, node.getMsid(), _nodeId);
|
| Answer[] answer = sendRebalanceCommand(node.getMsid(), hostId, node.getMsid(), _nodeId, Event.RequestAgentRebalance);
|
| if (answer == null) {
|
| s_logger.warn("Failed to get host id=" + hostId + " from management server " + node.getMsid());
|
| result = false;
|
| }
|
| } catch (Exception ex) {
|
| s_logger.warn("Failed to get host id=" + hostId + " from management server " + node.getMsid(), ex);
|
| result = false;
|
| } finally {
|
| if (transfer != null) {
|
| HostTransferMapVO transferState = _hostTransferDao.findByIdAndFutureOwnerId(transfer.getId(), _nodeId);
|
| if (!result && transferState != null && transferState.getState() == HostTransferState.TransferRequested) {
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("Removing mapping from op_host_transfer as it failed to be set to transfer mode");
|
| }
|
| //just remove the mapping (if exists) as nothing was done on the peer management server yet
|
| _hostTransferDao.remove(transfer.getId());
|
| }
|
| }
|
| }
|
| }
|
| } else {
|
| s_logger.debug("Found no hosts to rebalance from the management server " + node.getMsid());
|
| }
|
| }
|
| }
|
| }
|
|
|
| private Answer[] sendRebalanceCommand(long peer, long agentId, long currentOwnerId, long futureOwnerId, Event event) {
|
| TransferAgentCommand transfer = new TransferAgentCommand(agentId, currentOwnerId, futureOwnerId, event);
|
| Commands commands = new Commands(OnError.Stop);
|
| commands.addCommand(transfer);
|
|
|
| Command[] cmds = commands.toCommands();
|
|
|
| try {
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("Forwarding " + cmds[0].toString() + " to " + peer);
|
| }
|
| String peerName = Long.toString(peer);
|
| Answer[] answers = _clusterMgr.execute(peerName, agentId, cmds, true);
|
| return answers;
|
| } catch (Exception e) {
|
| s_logger.warn("Caught exception while talking to " + currentOwnerId, e);
|
| return null;
|
| }
|
| }
|
|
|
| private Runnable getTransferScanTask() {
|
| return new Runnable() {
|
| @Override
|
| public void run() {
|
| try {
|
| if (s_logger.isTraceEnabled()) {
|
| s_logger.trace("Clustered agent transfer scan check, management server id:" + _nodeId);
|
| }
|
| synchronized (_agentToTransferIds) {
|
| if (_agentToTransferIds.size() > 0) {
|
| s_logger.debug("Found " + _agentToTransferIds.size() + " agents to transfer");
|
| //for (Long hostId : _agentToTransferIds) {
|
| for (Iterator<Long> iterator = _agentToTransferIds.iterator(); iterator.hasNext();) {
|
| Long hostId = iterator.next();
|
| AgentAttache attache = findAttache(hostId);
|
|
|
| // if the thread:
|
| // 1) timed out waiting for the host to reconnect
|
| // 2) recipient management server is not active any more
|
| // 3) if the management server doesn't own the host any more
|
| // remove the host from re-balance list and delete from op_host_transfer DB
|
| // no need to do anything with the real attache as we haven't modified it yet
|
| Date cutTime = DateUtil.currentGMTTime();
|
| HostTransferMapVO transferMap = _hostTransferDao.findActiveHostTransferMapByHostId(hostId, new Date(cutTime.getTime() - rebalanceTimeOut));
|
|
|
| if (transferMap == null) {
|
| s_logger.debug("Timed out waiting for the host id=" + hostId + " to be ready to transfer, skipping rebalance for the host");
|
| iterator.remove();
|
| _hostTransferDao.completeAgentTransfer(hostId);
|
| continue;
|
| }
|
|
|
| if (transferMap.getInitialOwner() != _nodeId || attache.forForward()) {
|
| s_logger.debug("Management server " + _nodeId + " doesn't own host id=" + hostId + " any more, skipping rebalance for the host");
|
| iterator.remove();
|
| _hostTransferDao.completeAgentTransfer(hostId);
|
| continue;
|
| }
|
|
|
| ManagementServerHostVO ms = _mshostDao.findByMsid(transferMap.getFutureOwner());
|
| if (ms != null && ms.getState() != ManagementServerHost.State.Up) {
|
| s_logger.debug("Can't transfer host " + hostId + " as it's future owner is not in UP state: " + ms + ", skipping rebalance for the host");
|
| iterator.remove();
|
| _hostTransferDao.completeAgentTransfer(hostId);
|
| continue;
|
| }
|
|
|
| if (attache.getQueueSize() == 0 && attache.getNonRecurringListenersSize() == 0) {
|
| iterator.remove();
|
| try {
|
| _executor.execute(new RebalanceTask(hostId, transferMap.getInitialOwner(), transferMap.getFutureOwner()));
|
| } catch (RejectedExecutionException ex) {
|
| s_logger.warn("Failed to submit rebalance task for host id=" + hostId + "; postponing the execution");
|
| continue;
|
| }
|
|
|
| } else {
|
| s_logger.debug("Agent " + hostId + " can't be transfered yet as its request queue size is " + attache.getQueueSize() + " and listener queue size is " + attache.getNonRecurringListenersSize());
|
| }
|
| }
|
| } else {
|
| if (s_logger.isTraceEnabled()) {
|
| s_logger.trace("Found no agents to be transfered by the management server " + _nodeId);
|
| }
|
| }
|
| }
|
|
|
| } catch (Throwable e) {
|
| s_logger.error("Problem with the clustered agent transfer scan check!", e);
|
| }
|
| }
|
| };
|
| }
|
|
|
|
|
| private boolean setToWaitForRebalance(final long hostId, long currentOwnerId, long futureOwnerId) {
|
| s_logger.debug("Adding agent " + hostId + " to the list of agents to transfer");
|
| synchronized (_agentToTransferIds) {
|
| return _agentToTransferIds.add(hostId);
|
| }
|
| }
|
|
|
|
|
| protected boolean rebalanceHost(final long hostId, long currentOwnerId, long futureOwnerId) throws AgentUnavailableException{
|
|
|
| boolean result = true;
|
| if (currentOwnerId == _nodeId) {
|
| if (!startRebalance(hostId)) {
|
| s_logger.debug("Failed to start agent rebalancing");
|
| finishRebalance(hostId, futureOwnerId, Event.RebalanceFailed);
|
| return false;
|
| }
|
| try {
|
| Answer[] answer = sendRebalanceCommand(futureOwnerId, hostId, currentOwnerId, futureOwnerId, Event.StartAgentRebalance);
|
| if (answer == null || !answer[0].getResult()) {
|
| result = false;
|
| }
|
| |
| } catch (Exception ex) {
|
| s_logger.warn("Host " + hostId + " failed to connect to the management server " + futureOwnerId + " as a part of rebalance process", ex); |
| result = false;
|
| }
|
|
|
| if (result) {
|
| s_logger.debug("Successfully transfered host id=" + hostId + " to management server " + futureOwnerId);
|
| finishRebalance(hostId, futureOwnerId, Event.RebalanceCompleted);
|
| } else {
|
| s_logger.warn("Failed to transfer host id=" + hostId + " to management server " + futureOwnerId);
|
| finishRebalance(hostId, futureOwnerId, Event.RebalanceFailed);
|
| }
|
|
|
| } else if (futureOwnerId == _nodeId) {
|
| HostVO host = _hostDao.findById(hostId);
|
| try {
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("Loading directly connected host " + host.getId() + "(" + host.getName() + ") to the management server " + _nodeId + " as a part of rebalance process");
|
| }
|
| result = loadDirectlyConnectedHost(host, true);
|
| } catch (Exception ex) {
|
| s_logger.warn("Failed to load directly connected host " + host.getId() + "(" + host.getName() + ") to the management server " + _nodeId + " as a part of rebalance process due to:", ex);
|
| result = false;
|
| }
|
|
|
| if (result) {
|
| s_logger.debug("Successfully loaded directly connected host " + host.getId() + "(" + host.getName() + ") to the management server " + _nodeId + " as a part of rebalance process");
|
| } else {
|
| s_logger.warn("Failed to load directly connected host " + host.getId() + "(" + host.getName() + ") to the management server " + _nodeId + " as a part of rebalance process");
|
| }
|
| }
|
|
|
| return result;
|
| }
|
|
|
| |
| protected void finishRebalance(final long hostId, long futureOwnerId, Event event){
|
|
|
| boolean success = (event == Event.RebalanceCompleted) ? true : false;
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("Finishing rebalancing for the agent " + hostId + " with event " + event);
|
| }
|
|
|
| AgentAttache attache = findAttache(hostId);
|
| if (attache == null || !(attache instanceof ClusteredAgentAttache)) {
|
| s_logger.debug("Unable to find forward attache for the host id=" + hostId + ", assuming that the agent disconnected already");
|
| _hostTransferDao.completeAgentTransfer(hostId);
|
| return;
|
| }
|
|
|
| ClusteredAgentAttache forwardAttache = (ClusteredAgentAttache)attache;
|
|
|
| if (success) {
|
| |
| //1) Set transfer mode to false - so the agent can start processing requests normally
|
| forwardAttache.setTransferMode(false);
|
| |
| //2) Get all transfer requests and route them to peer
|
| Request requestToTransfer = forwardAttache.getRequestToTransfer();
|
| while (requestToTransfer != null) {
|
| s_logger.debug("Forwarding request " + requestToTransfer.getSequence() + " held in transfer attache " + hostId + " from the management server " + _nodeId + " to " + futureOwnerId);
|
| boolean routeResult = routeToPeer(Long.toString(futureOwnerId), requestToTransfer.getBytes());
|
| if (!routeResult) {
|
| logD(requestToTransfer.getBytes(), "Failed to route request to peer");
|
| }
|
|
|
| requestToTransfer = forwardAttache.getRequestToTransfer(); |
| }
|
|
|
| s_logger.debug("Management server " + _nodeId + " completed agent " + hostId + " rebalance to " + futureOwnerId); |
|
|
| } else {
|
| failRebalance(hostId);
|
| }
|
|
|
| s_logger.debug("Management server " + _nodeId + " completed agent " + hostId + " rebalance");
|
| _hostTransferDao.completeAgentTransfer(hostId);
|
| }
|
|
|
| protected void failRebalance(final long hostId){
|
| try {
|
| s_logger.debug("Management server " + _nodeId + " failed to rebalance agent " + hostId);
|
| _hostTransferDao.completeAgentTransfer(hostId);
|
| handleDisconnectWithoutInvestigation(findAttache(hostId), Event.RebalanceFailed);
|
| } catch (Exception ex) {
|
| s_logger.warn("Failed to reconnect host id=" + hostId + " as a part of failed rebalance task cleanup");
|
| }
|
| }
|
|
|
| protected boolean startRebalance(final long hostId) {
|
| HostVO host = _hostDao.findById(hostId);
|
|
|
| if (host == null || host.getRemoved() != null) {
|
| s_logger.warn("Unable to find host record, fail start rebalancing process");
|
| return false;
|
| }
|
|
|
| synchronized (_agents) {
|
| ClusteredDirectAgentAttache attache = (ClusteredDirectAgentAttache)_agents.get(hostId);
|
| if (attache != null && attache.getQueueSize() == 0 && attache.getNonRecurringListenersSize() == 0) {
|
| handleDisconnectWithoutInvestigation(attache, Event.StartAgentRebalance);
|
| ClusteredAgentAttache forwardAttache = (ClusteredAgentAttache)createAttache(hostId);
|
| if (forwardAttache == null) {
|
| s_logger.warn("Unable to create a forward attache for the host " + hostId + " as a part of rebalance process");
|
| return false;
|
| }
|
| s_logger.debug("Putting agent id=" + hostId + " to transfer mode");
|
| forwardAttache.setTransferMode(true);
|
| _agents.put(hostId, forwardAttache);
|
| } else {
|
| if (attache == null) {
|
| s_logger.warn("Attache for the agent " + hostId + " no longer exists on management server " + _nodeId + ", can't start host rebalancing");
|
| } else {
|
| s_logger.warn("Attache for the agent " + hostId + " has request queue size= " + attache.getQueueSize() + " and listener queue size " + attache.getNonRecurringListenersSize() + ", can't start host rebalancing");
|
| }
|
| return false;
|
| }
|
| } |
| _hostTransferDao.startAgentTransfer(hostId);
|
| return true;
|
| }
|
|
|
| protected void cleanupTransferMap(long msId) {
|
| List<HostTransferMapVO> hostsJoingingCluster = _hostTransferDao.listHostsJoiningCluster(msId);
|
|
|
| for (HostTransferMapVO hostJoingingCluster : hostsJoingingCluster) {
|
| _hostTransferDao.remove(hostJoingingCluster.getId());
|
| }
|
|
|
| List<HostTransferMapVO> hostsLeavingCluster = _hostTransferDao.listHostsLeavingCluster(msId);
|
| for (HostTransferMapVO hostLeavingCluster : hostsLeavingCluster) {
|
| _hostTransferDao.remove(hostLeavingCluster.getId());
|
| }
|
| }
|
|
|
|
|
| protected class RebalanceTask implements Runnable {
|
| Long hostId = null;
|
| Long currentOwnerId = null;
|
| Long futureOwnerId = null;
|
|
|
|
|
| public RebalanceTask(long hostId, long currentOwnerId, long futureOwnerId) {
|
| this.hostId = hostId;
|
| this.currentOwnerId = currentOwnerId;
|
| this.futureOwnerId = futureOwnerId;
|
| }
|
|
|
| @Override
|
| public void run() {
|
| try {
|
| if (s_logger.isDebugEnabled()) {
|
| s_logger.debug("Rebalancing host id=" + hostId);
|
| }
|
| rebalanceHost(hostId, currentOwnerId, futureOwnerId);
|
| } catch (Exception e) {
|
| s_logger.warn("Unable to rebalance host id=" + hostId, e);
|
| } finally {
|
| StackMaid.current().exitCleanup();
|
| }
|
| }
|
| }
|
|
|
| }
|
