| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with 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. |
| 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.api.ApiDBUtils; |
| 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, boolean transitState) { |
| 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, true); |
| } 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) { |
| //don't process disconnect if the host is being rebalanced |
| if (_clusterMgr.isAgentRebalanceEnabled()) { |
| HostTransferMapVO transferVO = _hostTransferDao.findById(hostId); |
| if (transferVO != null) { |
| if (transferVO.getFutureOwner() == _nodeId && transferVO.getState() == HostTransferState.TransferStarted) { |
| s_logger.debug("Not processing " + Event.AgentDisconnected + " event for the host id=" |
| + hostId +" as the host is being connected to " + _nodeId); |
| return true; |
| } |
| } |
| } |
| |
| //don't process disconnect if the disconnect came for the host via delayed cluster notification, |
| //but the host has already reconnected to the current management server |
| if (!attache.forForward()) { |
| s_logger.debug("Not processing " + Event.AgentDisconnected + " event for the host id=" |
| + hostId +" as the host is directly connected to the current management server " + _nodeId); |
| return true; |
| } |
| |
| return super.handleDisconnectWithoutInvestigation(attache, Event.AgentDisconnected, 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) { |
| AgentUnavailableException ex = new AgentUnavailableException("Host with specified id is not in the right state: " + host.getStatus(), hostId); |
| ex.addProxyObject(ApiDBUtils.findHostById(hostId).getUuid()); |
| throw ex; |
| } |
| |
| 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()); |
| final Long current = agent._currentSequence; |
| //if the request is the current request, always have to trigger sending next request in sequence, |
| //otherwise the agent queue will be blocked |
| if (req.executeInSequence() && (current != null && current == Request.getSequence(data))) { |
| agent.sendNext(Request.getSequence(data)); |
| } |
| 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 == null || 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("Disconnecting host " + host.getId() + "(" + host.getName() + " as a part of rebalance process without notification"); |
| } |
| |
| AgentAttache attache = findAttache(hostId); |
| if (attache != null) { |
| result = handleDisconnect(attache, Event.AgentDisconnected, false, false); |
| } |
| |
| if (result) { |
| 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); |
| } else { |
| s_logger.warn("Failed to disconnect " + host.getId() + "(" + host.getName() + |
| " as a part of rebalance process without notification"); |
| } |
| |
| } 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, true); |
| } 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, true); |
| 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(); |
| } |
| } |
| } |
| |
| } |
