// 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.cluster;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.ConnectException;
import java.net.InetSocketAddress;
import java.nio.channels.SocketChannel;
import java.rmi.RemoteException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import javax.ejb.Local;
import javax.naming.ConfigurationException;
import org.apache.log4j.Logger;
import com.cloud.agent.AgentManager;
import com.cloud.agent.AgentManager.OnError;
import com.cloud.agent.api.Answer;
import com.cloud.agent.api.ChangeAgentAnswer;
import com.cloud.agent.api.ChangeAgentCommand;
import com.cloud.agent.api.Command;
import com.cloud.agent.api.PropagateResourceEventCommand;
import com.cloud.agent.api.TransferAgentCommand;
import com.cloud.agent.manager.Commands;
import com.cloud.cluster.agentlb.dao.HostTransferMapDao;
import com.cloud.cluster.dao.ManagementServerHostDao;
import com.cloud.cluster.dao.ManagementServerHostPeerDao;
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.Event;
import com.cloud.host.dao.HostDao;
import com.cloud.resource.ResourceManager;
import com.cloud.resource.ResourceState;
import com.cloud.serializer.GsonHelper;
import com.cloud.utils.DateUtil;
import com.cloud.utils.NumbersUtil;
import com.cloud.utils.Profiler;
import com.cloud.utils.PropertiesUtil;
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.ConnectionConcierge;
import com.cloud.utils.db.DB;
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.events.SubscriptionMgr;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.utils.exception.ExceptionUtil;
import com.cloud.utils.mgmt.JmxUtil;
import com.cloud.utils.net.NetUtils;
import com.google.gson.Gson;
@Local(value = { ClusterManager.class })
public class ClusterManagerImpl implements ClusterManager {
private static final Logger s_logger = Logger.getLogger(ClusterManagerImpl.class);
private static final int EXECUTOR_SHUTDOWN_TIMEOUT = 1000; // 1 second
private static final int DEFAULT_OUTGOING_WORKERS = 5;
private final List<ClusterManagerListener> _listeners = new ArrayList<ClusterManagerListener>();
private final Map<Long, ManagementServerHostVO> _activePeers = new HashMap<Long, ManagementServerHostVO>();
private int _heartbeatInterval = ClusterManager.DEFAULT_HEARTBEAT_INTERVAL;
private int _heartbeatThreshold = ClusterManager.DEFAULT_HEARTBEAT_THRESHOLD;
private final Map<String, ClusterService> _clusterPeers;
private final Gson _gson;
@Inject
private AgentManager _agentMgr;
@Inject
private ClusteredAgentRebalanceService _rebalanceService;
@Inject
private ResourceManager _resourceMgr;
private final ScheduledExecutorService _heartbeatScheduler = Executors.newScheduledThreadPool(1, new NamedThreadFactory("Cluster-Heartbeat"));
private final ExecutorService _notificationExecutor = Executors.newFixedThreadPool(1, new NamedThreadFactory("Cluster-Notification"));
private final List<ClusterManagerMessage> _notificationMsgs = new ArrayList<ClusterManagerMessage>();
private ConnectionConcierge _heartbeatConnection = null;
private final ExecutorService _executor;
private ClusterServiceAdapter _currentServiceAdapter;
private ManagementServerHostDao _mshostDao;
private ManagementServerHostPeerDao _mshostPeerDao;
private HostDao _hostDao;
private HostTransferMapDao _hostTransferDao;
//
// pay attention to _mshostId and _msid
// _mshostId is the primary key of management host table
// _msid is the unique persistent identifier that peer name is based upon
//
private Long _mshostId = null;
protected long _msId = ManagementServerNode.getManagementServerId();
protected long _runId = System.currentTimeMillis();
private boolean _peerScanInited = false;
private String _name;
private String _clusterNodeIP = "127.0.0.1";
private boolean _agentLBEnabled = false;
private double _connectedAgentsThreshold = 0.7;
private static boolean _agentLbHappened = false;
private List<ClusterServicePdu> _clusterPduOutgoingQueue = new ArrayList<ClusterServicePdu>();
private List<ClusterServicePdu> _clusterPduIncomingQueue = new ArrayList<ClusterServicePdu>();
private Map<Long, ClusterServiceRequestPdu> _outgoingPdusWaitingForAck = new HashMap<Long, ClusterServiceRequestPdu>();
public ClusterManagerImpl() {
_clusterPeers = new HashMap<String, ClusterService>();
_gson = GsonHelper.getGson();
// executor to perform remote-calls in another thread context, to avoid potential
// recursive remote calls between nodes
//
_executor = Executors.newCachedThreadPool(new NamedThreadFactory("Cluster-Worker"));
}
private void registerRequestPdu(ClusterServiceRequestPdu pdu) {
synchronized(_outgoingPdusWaitingForAck) {
_outgoingPdusWaitingForAck.put(pdu.getSequenceId(), pdu);
}
}
private ClusterServiceRequestPdu popRequestPdu(long ackSequenceId) {
synchronized(_outgoingPdusWaitingForAck) {
if(_outgoingPdusWaitingForAck.get(ackSequenceId) != null) {
ClusterServiceRequestPdu pdu = _outgoingPdusWaitingForAck.get(ackSequenceId);
_outgoingPdusWaitingForAck.remove(ackSequenceId);
return pdu;
}
}
return null;
}
private void cancelClusterRequestToPeer(String strPeer) {
List<ClusterServiceRequestPdu> candidates = new ArrayList<ClusterServiceRequestPdu>();
synchronized(_outgoingPdusWaitingForAck) {
for(Map.Entry<Long, ClusterServiceRequestPdu> entry : _outgoingPdusWaitingForAck.entrySet()) {
if(entry.getValue().getDestPeer().equalsIgnoreCase(strPeer))
candidates.add(entry.getValue());
}
for(ClusterServiceRequestPdu pdu : candidates) {
_outgoingPdusWaitingForAck.remove(pdu.getSequenceId());
}
}
for(ClusterServiceRequestPdu pdu : candidates) {
s_logger.warn("Cancel cluster request PDU to peer: " + strPeer + ", pdu: " + _gson.toJson(pdu));
synchronized(pdu) {
pdu.notifyAll();
}
}
}
private void addOutgoingClusterPdu(ClusterServicePdu pdu) {
synchronized(_clusterPduOutgoingQueue) {
_clusterPduOutgoingQueue.add(pdu);
_clusterPduOutgoingQueue.notifyAll();
}
}
private ClusterServicePdu popOutgoingClusterPdu(long timeoutMs) {
synchronized(_clusterPduOutgoingQueue) {
try {
_clusterPduOutgoingQueue.wait(timeoutMs);
} catch (InterruptedException e) {
}
if(_clusterPduOutgoingQueue.size() > 0) {
ClusterServicePdu pdu = _clusterPduOutgoingQueue.get(0);
_clusterPduOutgoingQueue.remove(0);
return pdu;
}
}
return null;
}
private void addIncomingClusterPdu(ClusterServicePdu pdu) {
synchronized(_clusterPduIncomingQueue) {
_clusterPduIncomingQueue.add(pdu);
_clusterPduIncomingQueue.notifyAll();
}
}
private ClusterServicePdu popIncomingClusterPdu(long timeoutMs) {
synchronized(_clusterPduIncomingQueue) {
try {
_clusterPduIncomingQueue.wait(timeoutMs);
} catch (InterruptedException e) {
}
if(_clusterPduIncomingQueue.size() > 0) {
ClusterServicePdu pdu = _clusterPduIncomingQueue.get(0);
_clusterPduIncomingQueue.remove(0);
return pdu;
}
}
return null;
}
private Runnable getClusterPduSendingTask() {
return new Runnable() {
public void run() {
onSendingClusterPdu();
}
};
}
private Runnable getClusterPduNotificationTask() {
return new Runnable() {
public void run() {
onNotifyingClusterPdu();
}
};
}
private void onSendingClusterPdu() {
while(true) {
try {
ClusterServicePdu pdu = popOutgoingClusterPdu(1000);
if(pdu == null)
continue;
ClusterService peerService = null;
for(int i = 0; i < 2; i++) {
try {
peerService = getPeerService(pdu.getDestPeer());
} catch (RemoteException e) {
s_logger.error("Unable to get cluster service on peer : " + pdu.getDestPeer());
}
if(peerService != null) {
try {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Cluster PDU " + getSelfPeerName() + " -> " + pdu.getDestPeer() + ". agent: " + pdu.getAgentId()
+ ", pdu seq: " + pdu.getSequenceId() + ", pdu ack seq: " + pdu.getAckSequenceId() + ", json: " + pdu.getJsonPackage());
}
long startTick = System.currentTimeMillis();
String strResult = peerService.execute(pdu);
if(s_logger.isDebugEnabled()) {
s_logger.debug("Cluster PDU " + getSelfPeerName() + " -> " + pdu.getDestPeer() + " completed. time: " +
(System.currentTimeMillis() - startTick) + "ms. agent: " + pdu.getAgentId()
+ ", pdu seq: " + pdu.getSequenceId() + ", pdu ack seq: " + pdu.getAckSequenceId() + ", json: " + pdu.getJsonPackage());
}
if("true".equals(strResult))
break;
} catch (RemoteException e) {
invalidatePeerService(pdu.getDestPeer());
if(s_logger.isInfoEnabled()) {
s_logger.info("Exception on remote execution, peer: " + pdu.getDestPeer() + ", iteration: "
+ i + ", exception message :" + e.getMessage());
}
}
}
}
} catch(Throwable e) {
s_logger.error("Unexcpeted exception: ", e);
}
}
}
private void onNotifyingClusterPdu() {
while(true) {
try {
final ClusterServicePdu pdu = popIncomingClusterPdu(1000);
if(pdu == null)
continue;
_executor.execute(new Runnable() {
public void run() {
if(pdu.getPduType() == ClusterServicePdu.PDU_TYPE_RESPONSE) {
ClusterServiceRequestPdu requestPdu = popRequestPdu(pdu.getAckSequenceId());
if(requestPdu != null) {
requestPdu.setResponseResult(pdu.getJsonPackage());
synchronized(requestPdu) {
requestPdu.notifyAll();
}
} else {
s_logger.warn("Original request has already been cancelled. pdu: " + _gson.toJson(pdu));
}
} else {
String result = dispatchClusterServicePdu(pdu);
if(result == null)
result = "";
if(pdu.getPduType() == ClusterServicePdu.PDU_TYPE_REQUEST) {
ClusterServicePdu responsePdu = new ClusterServicePdu();
responsePdu.setPduType(ClusterServicePdu.PDU_TYPE_RESPONSE);
responsePdu.setSourcePeer(pdu.getDestPeer());
responsePdu.setDestPeer(pdu.getSourcePeer());
responsePdu.setAckSequenceId(pdu.getSequenceId());
responsePdu.setJsonPackage(result);
addOutgoingClusterPdu(responsePdu);
}
}
}
});
} catch(Throwable e) {
s_logger.error("Unexcpeted exception: ", e);
}
}
}
private String dispatchClusterServicePdu(ClusterServicePdu pdu) {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Dispatch ->" + pdu.getAgentId() + ", json: " + pdu.getJsonPackage());
}
Command [] cmds = null;
try {
cmds = _gson.fromJson(pdu.getJsonPackage(), Command[].class);
} catch(Throwable e) {
assert(false);
s_logger.error("Excection in gson decoding : ", e);
}
if (cmds.length == 1 && cmds[0] instanceof ChangeAgentCommand) { //intercepted
ChangeAgentCommand cmd = (ChangeAgentCommand)cmds[0];
if (s_logger.isDebugEnabled()) {
s_logger.debug("Intercepting command for agent change: agent " + cmd.getAgentId() + " event: " + cmd.getEvent());
}
boolean result = false;
try {
result = executeAgentUserRequest(cmd.getAgentId(), cmd.getEvent());
if (s_logger.isDebugEnabled()) {
s_logger.debug("Result is " + result);
}
} catch (AgentUnavailableException e) {
s_logger.warn("Agent is unavailable", e);
return null;
}
Answer[] answers = new Answer[1];
answers[0] = new ChangeAgentAnswer(cmd, result);
return _gson.toJson(answers);
} else if (cmds.length == 1 && cmds[0] instanceof TransferAgentCommand) {
TransferAgentCommand cmd = (TransferAgentCommand) cmds[0];
if (s_logger.isDebugEnabled()) {
s_logger.debug("Intercepting command for agent rebalancing: agent " + cmd.getAgentId() + " event: " + cmd.getEvent());
}
boolean result = false;
try {
result = rebalanceAgent(cmd.getAgentId(), cmd.getEvent(), cmd.getCurrentOwner(), cmd.getFutureOwner());
if (s_logger.isDebugEnabled()) {
s_logger.debug("Result is " + result);
}
} catch (AgentUnavailableException e) {
s_logger.warn("Agent is unavailable", e);
return null;
} catch (OperationTimedoutException e) {
s_logger.warn("Operation timed out", e);
return null;
}
Answer[] answers = new Answer[1];
answers[0] = new Answer(cmd, result, null);
return _gson.toJson(answers);
}
try {
long startTick = System.currentTimeMillis();
if(s_logger.isDebugEnabled()) {
s_logger.debug("Dispatch -> " + pdu.getAgentId() + ", json: " + pdu.getJsonPackage());
}
Answer[] answers = sendToAgent(pdu.getAgentId(), cmds, pdu.isStopOnError());
if(answers != null) {
String jsonReturn = _gson.toJson(answers);
if(s_logger.isDebugEnabled()) {
s_logger.debug("Completed dispatching -> " + pdu.getAgentId() + ", json: " + pdu.getJsonPackage() +
" in " + (System.currentTimeMillis() - startTick) + " ms, return result: " + jsonReturn);
}
return jsonReturn;
} else {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Completed dispatching -> " + pdu.getAgentId() + ", json: " + pdu.getJsonPackage() +
" in " + (System.currentTimeMillis() - startTick) + " ms, return null result");
}
}
} catch(AgentUnavailableException e) {
s_logger.warn("Agent is unavailable", e);
} catch (OperationTimedoutException e) {
s_logger.warn("Timed Out", e);
}
return null;
}
public void OnReceiveClusterServicePdu(ClusterServicePdu pdu) {
addIncomingClusterPdu(pdu);
}
@Override
public Answer[] sendToAgent(Long hostId, Command[] cmds, boolean stopOnError) throws AgentUnavailableException, OperationTimedoutException {
Commands commands = new Commands(stopOnError ? OnError.Stop : OnError.Continue);
for (Command cmd : cmds) {
commands.addCommand(cmd);
}
return _agentMgr.send(hostId, commands);
}
@Override
public boolean executeAgentUserRequest(long agentId, Event event) throws AgentUnavailableException {
return _agentMgr.executeUserRequest(agentId, event);
}
@Override
public Boolean propagateAgentEvent(long agentId, Event event) throws AgentUnavailableException {
final String msPeer = getPeerName(agentId);
if (msPeer == null) {
return null;
}
if (s_logger.isDebugEnabled()) {
s_logger.debug("Propagating agent change request event:" + event.toString() + " to agent:" + agentId);
}
Command[] cmds = new Command[1];
cmds[0] = new ChangeAgentCommand(agentId, event);
Answer[] answers = execute(msPeer, agentId, cmds, true);
if (answers == null) {
throw new AgentUnavailableException(agentId);
}
if (s_logger.isDebugEnabled()) {
s_logger.debug("Result for agent change is " + answers[0].getResult());
}
return answers[0].getResult();
}
/**
* called by DatabaseUpgradeChecker to see if there are other peers running.
*
* @param notVersion
* If version is passed in, the peers CANNOT be running at this version. If version is null, return true if any
* peer is running regardless of version.
* @return true if there are peers running and false if not.
*/
public static final boolean arePeersRunning(String notVersion) {
return false; // TODO: Leaving this for Kelven to take care of.
}
@Override
public void broadcast(long agentId, Command[] cmds) {
Date cutTime = DateUtil.currentGMTTime();
List<ManagementServerHostVO> peers = _mshostDao.getActiveList(new Date(cutTime.getTime() - _heartbeatThreshold));
for (ManagementServerHostVO peer : peers) {
String peerName = Long.toString(peer.getMsid());
if (getSelfPeerName().equals(peerName)) {
continue; // Skip myself.
}
try {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Forwarding " + cmds[0].toString() + " to " + peer.getMsid());
}
executeAsync(peerName, agentId, cmds, true);
} catch (Exception e) {
s_logger.warn("Caught exception while talkign to " + peer.getMsid());
}
}
}
@Override
public void executeAsync(String strPeer, long agentId, Command [] cmds, boolean stopOnError) {
ClusterServicePdu pdu = new ClusterServicePdu();
pdu.setSourcePeer(getSelfPeerName());
pdu.setDestPeer(strPeer);
pdu.setAgentId(agentId);
pdu.setJsonPackage(_gson.toJson(cmds, Command[].class));
pdu.setStopOnError(true);
addOutgoingClusterPdu(pdu);
}
@Override
public Answer[] execute(String strPeer, long agentId, Command [] cmds, boolean stopOnError) {
if(s_logger.isDebugEnabled()) {
s_logger.debug(getSelfPeerName() + " -> " + strPeer + "." + agentId + " " +
_gson.toJson(cmds, Command[].class));
}
ClusterServiceRequestPdu pdu = new ClusterServiceRequestPdu();
pdu.setSourcePeer(getSelfPeerName());
pdu.setDestPeer(strPeer);
pdu.setAgentId(agentId);
pdu.setJsonPackage(_gson.toJson(cmds, Command[].class));
pdu.setStopOnError(stopOnError);
registerRequestPdu(pdu);
addOutgoingClusterPdu(pdu);
synchronized(pdu) {
try {
pdu.wait();
} catch (InterruptedException e) {
}
}
if(s_logger.isDebugEnabled()) {
s_logger.debug(getSelfPeerName() + " -> " + strPeer + "." + agentId + " completed. result: " +
pdu.getResponseResult());
}
if(pdu.getResponseResult() != null && pdu.getResponseResult().length() > 0) {
try {
return _gson.fromJson(pdu.getResponseResult(), Answer[].class);
} catch(Throwable e) {
s_logger.error("Exception on parsing gson package from remote call to " + strPeer);
}
}
return null;
}
@Override
public String getPeerName(long agentHostId) {
HostVO host = _hostDao.findById(agentHostId);
if(host != null && host.getManagementServerId() != null) {
if(getSelfPeerName().equals(Long.toString(host.getManagementServerId()))) {
return null;
}
return Long.toString(host.getManagementServerId());
}
return null;
}
@Override
public ManagementServerHostVO getPeer(String mgmtServerId) {
return _mshostDao.findByMsid(Long.valueOf(mgmtServerId));
}
@Override
public String getSelfPeerName() {
return Long.toString(_msId);
}
@Override
public String getSelfNodeIP() {
return _clusterNodeIP;
}
@Override
public void registerListener(ClusterManagerListener listener) {
// Note : we don't check duplicates
synchronized (_listeners) {
s_logger.info("register cluster listener " + listener.getClass());
_listeners.add(listener);
}
}
@Override
public void unregisterListener(ClusterManagerListener listener) {
synchronized(_listeners) {
s_logger.info("unregister cluster listener " + listener.getClass());
_listeners.remove(listener);
}
}
public void notifyNodeJoined(List<ManagementServerHostVO> nodeList) {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Notify management server node join to listeners.");
for(ManagementServerHostVO mshost : nodeList) {
s_logger.debug("Joining node, IP: " + mshost.getServiceIP() + ", msid: " + mshost.getMsid());
}
}
synchronized(_listeners) {
for(ClusterManagerListener listener : _listeners) {
listener.onManagementNodeJoined(nodeList, _mshostId);
}
}
SubscriptionMgr.getInstance().notifySubscribers(ClusterManager.ALERT_SUBJECT, this,
new ClusterNodeJoinEventArgs(_mshostId, nodeList));
}
public void notifyNodeLeft(List<ManagementServerHostVO> nodeList) {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Notify management server node left to listeners.");
}
for(ManagementServerHostVO mshost : nodeList) {
if(s_logger.isDebugEnabled())
s_logger.debug("Leaving node, IP: " + mshost.getServiceIP() + ", msid: " + mshost.getMsid());
cancelClusterRequestToPeer(String.valueOf(mshost.getMsid()));
}
synchronized(_listeners) {
for(ClusterManagerListener listener : _listeners) {
listener.onManagementNodeLeft(nodeList, _mshostId);
}
}
SubscriptionMgr.getInstance().notifySubscribers(ClusterManager.ALERT_SUBJECT, this,
new ClusterNodeLeftEventArgs(_mshostId, nodeList));
}
public void notifyNodeIsolated() {
if(s_logger.isDebugEnabled())
s_logger.debug("Notify management server node isolation to listeners");
synchronized(_listeners) {
for(ClusterManagerListener listener : _listeners) {
listener.onManagementNodeIsolated();
}
}
}
public ClusterService getPeerService(String strPeer) throws RemoteException {
synchronized(_clusterPeers) {
if(_clusterPeers.containsKey(strPeer)) {
return _clusterPeers.get(strPeer);
}
}
ClusterService service = _currentServiceAdapter.getPeerService(strPeer);
if(service != null) {
synchronized(_clusterPeers) {
// re-check the peer map again to deal with the
// race conditions
if(!_clusterPeers.containsKey(strPeer)) {
_clusterPeers.put(strPeer, service);
}
}
}
return service;
}
public void invalidatePeerService(String strPeer) {
synchronized(_clusterPeers) {
if(_clusterPeers.containsKey(strPeer)) {
_clusterPeers.remove(strPeer);
}
}
}
private Runnable getHeartbeatTask() {
return new Runnable() {
@Override
public void run() {
Transaction txn = Transaction.open("ClusterHeartBeat");
try {
Profiler profiler = new Profiler();
Profiler profilerHeartbeatUpdate = new Profiler();
Profiler profilerPeerScan = new Profiler();
Profiler profilerAgentLB = new Profiler();
try {
profiler.start();
profilerHeartbeatUpdate.start();
txn.transitToUserManagedConnection(getHeartbeatConnection());
if(s_logger.isTraceEnabled()) {
s_logger.trace("Cluster manager heartbeat update, id:" + _mshostId);
}
_mshostDao.update(_mshostId, getCurrentRunId(), DateUtil.currentGMTTime());
profilerHeartbeatUpdate.stop();
profilerPeerScan.start();
if (s_logger.isTraceEnabled()) {
s_logger.trace("Cluster manager peer-scan, id:" + _mshostId);
}
if (!_peerScanInited) {
_peerScanInited = true;
initPeerScan();
}
peerScan();
profilerPeerScan.stop();
profilerAgentLB.start();
//initiate agent lb task will be scheduled and executed only once, and only when number of agents loaded exceeds _connectedAgentsThreshold
if (_agentLBEnabled && !_agentLbHappened) {
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> allManagedRoutingAgents = sc.list();
sc = SearchCriteria2.create(HostVO.class);
sc.addAnd(sc.getEntity().getType(), Op.EQ, Host.Type.Routing);
List<HostVO> allAgents = sc.list();
double allHostsCount = allAgents.size();
double managedHostsCount = allManagedRoutingAgents.size();
if (allHostsCount > 0.0) {
double load = managedHostsCount/allHostsCount;
if (load >= _connectedAgentsThreshold) {
s_logger.debug("Scheduling agent rebalancing task as the average agent load " + load + " is more than the threshold " + _connectedAgentsThreshold);
_rebalanceService.scheduleRebalanceAgents();
_agentLbHappened = true;
} else {
s_logger.trace("Not scheduling agent rebalancing task as the averages load " + load + " is less than the threshold " + _connectedAgentsThreshold);
}
}
}
profilerAgentLB.stop();
} finally {
profiler.stop();
if(profiler.getDuration() >= _heartbeatInterval) {
if(s_logger.isDebugEnabled())
s_logger.debug("Management server heartbeat takes too long to finish. profiler: " + profiler.toString() +
", profilerHeartbeatUpdate: " + profilerHeartbeatUpdate.toString() +
", profilerPeerScan: " + profilerPeerScan.toString() +
", profilerAgentLB: " + profilerAgentLB.toString());
}
}
} catch(CloudRuntimeException e) {
s_logger.error("Runtime DB exception ", e.getCause());
if(e.getCause() instanceof ClusterInvalidSessionException) {
s_logger.error("Invalid cluster session found, fence it");
queueNotification(new ClusterManagerMessage(ClusterManagerMessage.MessageType.nodeIsolated));
}
if(isRootCauseConnectionRelated(e.getCause())) {
s_logger.error("DB communication problem detected, fence it");
queueNotification(new ClusterManagerMessage(ClusterManagerMessage.MessageType.nodeIsolated));
}
invalidHeartbeatConnection();
} catch(ActiveFencingException e) {
queueNotification(new ClusterManagerMessage(ClusterManagerMessage.MessageType.nodeIsolated));
} catch (Throwable e) {
s_logger.error("Unexpected exception in cluster heartbeat", e);
if(isRootCauseConnectionRelated(e.getCause())) {
s_logger.error("DB communication problem detected, fence it");
queueNotification(new ClusterManagerMessage(ClusterManagerMessage.MessageType.nodeIsolated));
}
invalidHeartbeatConnection();
} finally {
txn.close("ClusterHeartBeat");
}
}
};
}
private boolean isRootCauseConnectionRelated(Throwable e) {
while (e != null) {
if (e instanceof com.mysql.jdbc.CommunicationsException || e instanceof com.mysql.jdbc.exceptions.jdbc4.CommunicationsException) {
return true;
}
e = e.getCause();
}
return false;
}
private Connection getHeartbeatConnection() throws SQLException {
if(_heartbeatConnection == null) {
Connection conn = Transaction.getStandaloneConnectionWithException();
_heartbeatConnection = new ConnectionConcierge("ClusterManagerHeartBeat", conn, false);
}
return _heartbeatConnection.conn();
}
private void invalidHeartbeatConnection() {
if(_heartbeatConnection != null) {
Connection conn = Transaction.getStandaloneConnection();
if (conn != null) {
_heartbeatConnection.reset(Transaction.getStandaloneConnection());
}
}
}
private Runnable getNotificationTask() {
return new Runnable() {
@Override
public void run() {
while(true) {
synchronized(_notificationMsgs) {
try {
_notificationMsgs.wait(1000);
} catch (InterruptedException e) {
}
}
ClusterManagerMessage msg = null;
while((msg = getNextNotificationMessage()) != null) {
try {
switch(msg.getMessageType()) {
case nodeAdded:
if(msg.getNodes() != null && msg.getNodes().size() > 0) {
Profiler profiler = new Profiler();
profiler.start();
notifyNodeJoined(msg.getNodes());
profiler.stop();
if(profiler.getDuration() > 1000) {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Notifying management server join event took " + profiler.getDuration() + " ms");
}
} else {
s_logger.warn("Notifying management server join event took " + profiler.getDuration() + " ms");
}
}
break;
case nodeRemoved:
if(msg.getNodes() != null && msg.getNodes().size() > 0) {
Profiler profiler = new Profiler();
profiler.start();
notifyNodeLeft(msg.getNodes());
profiler.stop();
if(profiler.getDuration() > 1000) {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Notifying management server leave event took " + profiler.getDuration() + " ms");
}
} else {
s_logger.warn("Notifying management server leave event took " + profiler.getDuration() + " ms");
}
}
break;
case nodeIsolated:
notifyNodeIsolated();
break;
default :
assert(false);
break;
}
} catch (Throwable e) {
s_logger.warn("Unexpected exception during cluster notification. ", e);
}
}
try { Thread.sleep(1000); } catch (InterruptedException e) {}
}
}
};
}
private void queueNotification(ClusterManagerMessage msg) {
synchronized(this._notificationMsgs) {
this._notificationMsgs.add(msg);
this._notificationMsgs.notifyAll();
}
switch(msg.getMessageType()) {
case nodeAdded:
{
List<ManagementServerHostVO> l = msg.getNodes();
if(l != null && l.size() > 0) {
for(ManagementServerHostVO mshost: l) {
_mshostPeerDao.updatePeerInfo(_mshostId, mshost.getId(), mshost.getRunid(), ManagementServerHost.State.Up);
}
}
}
break;
case nodeRemoved:
{
List<ManagementServerHostVO> l = msg.getNodes();
if(l != null && l.size() > 0) {
for(ManagementServerHostVO mshost: l) {
_mshostPeerDao.updatePeerInfo(_mshostId, mshost.getId(), mshost.getRunid(), ManagementServerHost.State.Down);
}
}
}
break;
default :
break;
}
}
private ClusterManagerMessage getNextNotificationMessage() {
synchronized(this._notificationMsgs) {
if(this._notificationMsgs.size() > 0) {
return this._notificationMsgs.remove(0);
}
}
return null;
}
private void initPeerScan() {
// upon startup, for all inactive management server nodes that we see at startup time, we will send notification also to help upper layer perform
// missed cleanup
Date cutTime = DateUtil.currentGMTTime();
List<ManagementServerHostVO> inactiveList = _mshostDao.getInactiveList(new Date(cutTime.getTime() - _heartbeatThreshold));
// We don't have foreign key constraints to enforce the mgmt_server_id integrity in host table, when user manually
// remove records from mshost table, this will leave orphan mgmt_serve_id reference in host table.
List<Long> orphanList = _mshostDao.listOrphanMsids();
if(orphanList.size() > 0) {
for(Long orphanMsid : orphanList) {
// construct fake ManagementServerHostVO based on orphan MSID
s_logger.info("Add orphan management server msid found in host table to initial clustering notification, orphan msid: " + orphanMsid);
inactiveList.add(new ManagementServerHostVO(orphanMsid, 0, "orphan", 0, new Date()));
}
} else {
s_logger.info("We are good, no orphan management server msid in host table is found");
}
if(inactiveList.size() > 0) {
if(s_logger.isInfoEnabled()) {
s_logger.info("Found " + inactiveList.size() + " inactive management server node based on timestamp");
for(ManagementServerHostVO host : inactiveList)
s_logger.info("management server node msid: " + host.getMsid() + ", name: " + host.getName() + ", service ip: " + host.getServiceIP() + ", version: " + host.getVersion());
}
List<ManagementServerHostVO> downHostList = new ArrayList<ManagementServerHostVO>();
for(ManagementServerHostVO host : inactiveList) {
if(!pingManagementNode(host)) {
s_logger.warn("Management node " + host.getId() + " is detected inactive by timestamp and also not pingable");
downHostList.add(host);
}
}
if(downHostList.size() > 0)
this.queueNotification(new ClusterManagerMessage(ClusterManagerMessage.MessageType.nodeRemoved, downHostList));
} else {
s_logger.info("No inactive management server node found");
}
}
private void peerScan() throws ActiveFencingException {
Date cutTime = DateUtil.currentGMTTime();
Profiler profiler = new Profiler();
profiler.start();
Profiler profilerQueryActiveList = new Profiler();
profilerQueryActiveList.start();
List<ManagementServerHostVO> currentList = _mshostDao.getActiveList(new Date(cutTime.getTime() - _heartbeatThreshold));
profilerQueryActiveList.stop();
Profiler profilerSyncClusterInfo = new Profiler();
profilerSyncClusterInfo.start();
List<ManagementServerHostVO> removedNodeList = new ArrayList<ManagementServerHostVO>();
List<ManagementServerHostVO> invalidatedNodeList = new ArrayList<ManagementServerHostVO>();
if(_mshostId != null) {
if(_mshostPeerDao.countStateSeenInPeers(_mshostId, _runId, ManagementServerHost.State.Down) > 0) {
String msg = "We have detected that at least one management server peer reports that this management server is down, perform active fencing to avoid split-brain situation";
s_logger.error(msg);
throw new ActiveFencingException(msg);
}
// only if we have already attached to cluster, will we start to check leaving nodes
for(Map.Entry<Long, ManagementServerHostVO> entry : _activePeers.entrySet()) {
ManagementServerHostVO current = getInListById(entry.getKey(), currentList);
if(current == null) {
if(entry.getKey().longValue() != _mshostId.longValue()) {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Detected management node left, id:" + entry.getKey() + ", nodeIP:" + entry.getValue().getServiceIP());
}
removedNodeList.add(entry.getValue());
}
} else {
if(current.getRunid() == 0) {
if(entry.getKey().longValue() != _mshostId.longValue()) {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Detected management node left because of invalidated session, id:" + entry.getKey() + ", nodeIP:" + entry.getValue().getServiceIP());
}
invalidatedNodeList.add(entry.getValue());
}
} else {
if(entry.getValue().getRunid() != current.getRunid()) {
if(s_logger.isDebugEnabled()) {
s_logger.debug("Detected management node left and rejoined quickly, id:" + entry.getKey() + ", nodeIP:" + entry.getValue().getServiceIP());
}
entry.getValue().setRunid(current.getRunid());
}
}
}
}
}
profilerSyncClusterInfo.stop();
Profiler profilerInvalidatedNodeList = new Profiler();
profilerInvalidatedNodeList.start();
// process invalidated node list
if(invalidatedNodeList.size() > 0) {
for(ManagementServerHostVO mshost : invalidatedNodeList) {
_activePeers.remove(mshost.getId());
try {
JmxUtil.unregisterMBean("ClusterManager", "Node " + mshost.getId());
} catch(Exception e) {
s_logger.warn("Unable to deregiester cluster node from JMX monitoring due to exception " + e.toString());
}
}
this.queueNotification(new ClusterManagerMessage(ClusterManagerMessage.MessageType.nodeRemoved, invalidatedNodeList));
}
profilerInvalidatedNodeList.stop();
Profiler profilerRemovedList = new Profiler();
profilerRemovedList.start();
// process removed node list
Iterator<ManagementServerHostVO> it = removedNodeList.iterator();
while(it.hasNext()) {
ManagementServerHostVO mshost = it.next();
if(!pingManagementNode(mshost)) {
s_logger.warn("Management node " + mshost.getId() + " is detected inactive by timestamp and also not pingable");
_activePeers.remove(mshost.getId());
try {
JmxUtil.unregisterMBean("ClusterManager", "Node " + mshost.getId());
} catch(Exception e) {
s_logger.warn("Unable to deregiester cluster node from JMX monitoring due to exception " + e.toString());
}
} else {
s_logger.info("Management node " + mshost.getId() + " is detected inactive by timestamp but is pingable");
it.remove();
}
}
if(removedNodeList.size() > 0) {
this.queueNotification(new ClusterManagerMessage(ClusterManagerMessage.MessageType.nodeRemoved, removedNodeList));
}
profilerRemovedList.stop();
List<ManagementServerHostVO> newNodeList = new ArrayList<ManagementServerHostVO>();
for(ManagementServerHostVO mshost : currentList) {
if(!_activePeers.containsKey(mshost.getId())) {
_activePeers.put(mshost.getId(), mshost);
if(s_logger.isDebugEnabled()) {
s_logger.debug("Detected management node joined, id:" + mshost.getId() + ", nodeIP:" + mshost.getServiceIP());
}
newNodeList.add(mshost);
try {
JmxUtil.registerMBean("ClusterManager", "Node " + mshost.getId(), new ClusterManagerMBeanImpl(this, mshost));
} catch(Exception e) {
s_logger.warn("Unable to regiester cluster node into JMX monitoring due to exception " + ExceptionUtil.toString(e));
}
}
}
if(newNodeList.size() > 0) {
this.queueNotification(new ClusterManagerMessage(ClusterManagerMessage.MessageType.nodeAdded, newNodeList));
}
profiler.stop();
if(profiler.getDuration() >= this._heartbeatInterval) {
if(s_logger.isDebugEnabled())
s_logger.debug("Peer scan takes too long to finish. profiler: " + profiler.toString()
+ ", profilerQueryActiveList: " + profilerQueryActiveList.toString()
+ ", profilerSyncClusterInfo: " + profilerSyncClusterInfo.toString()
+ ", profilerInvalidatedNodeList: " + profilerInvalidatedNodeList.toString()
+ ", profilerRemovedList: " + profilerRemovedList.toString());
}
}
private static ManagementServerHostVO getInListById(Long id, List<ManagementServerHostVO> l) {
for(ManagementServerHostVO mshost : l) {
if(mshost.getId() == id) {
return mshost;
}
}
return null;
}
@Override
public String getName() {
return _name;
}
@Override @DB
public boolean start() {
if(s_logger.isInfoEnabled()) {
s_logger.info("Starting cluster manager, msid : " + _msId);
}
Transaction txn = Transaction.currentTxn();
try {
txn.start();
final Class<?> c = this.getClass();
String version = c.getPackage().getImplementationVersion();
ManagementServerHostVO mshost = _mshostDao.findByMsid(_msId);
if (mshost == null) {
mshost = new ManagementServerHostVO();
mshost.setMsid(_msId);
mshost.setRunid(this.getCurrentRunId());
mshost.setName(NetUtils.getHostName());
mshost.setVersion(version);
mshost.setServiceIP(_clusterNodeIP);
mshost.setServicePort(_currentServiceAdapter.getServicePort());
mshost.setLastUpdateTime(DateUtil.currentGMTTime());
mshost.setRemoved(null);
mshost.setAlertCount(0);
mshost.setState(ManagementServerHost.State.Up);
_mshostDao.persist(mshost);
if (s_logger.isInfoEnabled()) {
s_logger.info("New instance of management server msid " + _msId + " is being started");
}
} else {
if (s_logger.isInfoEnabled()) {
s_logger.info("Management server " + _msId + " is being started");
}
_mshostDao.update(mshost.getId(), getCurrentRunId(), NetUtils.getHostName(), version, _clusterNodeIP, _currentServiceAdapter.getServicePort(), DateUtil.currentGMTTime());
}
txn.commit();
_mshostId = mshost.getId();
if (s_logger.isInfoEnabled()) {
s_logger.info("Management server (host id : " + _mshostId + ") is being started at " + _clusterNodeIP + ":" + _currentServiceAdapter.getServicePort());
}
_mshostPeerDao.clearPeerInfo(_mshostId);
// use seperate thread for heartbeat updates
_heartbeatScheduler.scheduleAtFixedRate(getHeartbeatTask(), _heartbeatInterval, _heartbeatInterval, TimeUnit.MILLISECONDS);
_notificationExecutor.submit(getNotificationTask());
} catch (Throwable e) {
s_logger.error("Unexpected exception : ", e);
txn.rollback();
throw new CloudRuntimeException("Unable to initialize cluster info into database");
}
if (s_logger.isInfoEnabled()) {
s_logger.info("Cluster manager was started successfully");
}
return true;
}
@Override @DB
public boolean stop() {
if(_mshostId != null) {
ManagementServerHostVO mshost = _mshostDao.findByMsid(_msId);
mshost.setState(ManagementServerHost.State.Down);
_mshostDao.update(_mshostId, mshost);
}
_heartbeatScheduler.shutdownNow();
_executor.shutdownNow();
try {
_heartbeatScheduler.awaitTermination(EXECUTOR_SHUTDOWN_TIMEOUT, TimeUnit.MILLISECONDS);
_executor.awaitTermination(EXECUTOR_SHUTDOWN_TIMEOUT, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
}
if(s_logger.isInfoEnabled()) {
s_logger.info("Cluster manager is stopped");
}
return true;
}
@Override
public boolean configure(String name, Map<String, Object> params) throws ConfigurationException {
if(s_logger.isInfoEnabled()) {
s_logger.info("Start configuring cluster manager : " + name);
}
_name = name;
ComponentLocator locator = ComponentLocator.getCurrentLocator();
_agentMgr = locator.getManager(AgentManager.class);
if (_agentMgr == null) {
throw new ConfigurationException("Unable to get " + AgentManager.class.getName());
}
_mshostDao = locator.getDao(ManagementServerHostDao.class);
if (_mshostDao == null) {
throw new ConfigurationException("Unable to get " + ManagementServerHostDao.class.getName());
}
_mshostPeerDao = locator.getDao(ManagementServerHostPeerDao.class);
if (_mshostPeerDao == null) {
throw new ConfigurationException("Unable to get " + ManagementServerHostPeerDao.class.getName());
}
_hostDao = locator.getDao(HostDao.class);
if (_hostDao == null) {
throw new ConfigurationException("Unable to get " + HostDao.class.getName());
}
_hostTransferDao = locator.getDao(HostTransferMapDao.class);
if (_hostTransferDao == null) {
throw new ConfigurationException("Unable to get agent transfer map dao");
}
ConfigurationDao configDao = locator.getDao(ConfigurationDao.class);
if (configDao == null) {
throw new ConfigurationException("Unable to get the configuration dao.");
}
Map<String, String> configs = configDao.getConfiguration("management-server", params);
String value = configs.get("cluster.heartbeat.interval");
if (value != null) {
_heartbeatInterval = NumbersUtil.parseInt(value, ClusterManager.DEFAULT_HEARTBEAT_INTERVAL);
}
value = configs.get("cluster.heartbeat.threshold");
if (value != null) {
_heartbeatThreshold = NumbersUtil.parseInt(value, ClusterManager.DEFAULT_HEARTBEAT_THRESHOLD);
}
File dbPropsFile = PropertiesUtil.findConfigFile("db.properties");
Properties dbProps = new Properties();
try {
dbProps.load(new FileInputStream(dbPropsFile));
} catch (FileNotFoundException e) {
throw new ConfigurationException("Unable to find db.properties");
} catch (IOException e) {
throw new ConfigurationException("Unable to load db.properties content");
}
_clusterNodeIP = dbProps.getProperty("cluster.node.IP");
if (_clusterNodeIP == null) {
_clusterNodeIP = "127.0.0.1";
}
_clusterNodeIP = _clusterNodeIP.trim();
if(s_logger.isInfoEnabled()) {
s_logger.info("Cluster node IP : " + _clusterNodeIP);
}
if(!NetUtils.isLocalAddress(_clusterNodeIP)) {
throw new ConfigurationException("cluster node IP should be valid local address where the server is running, please check your configuration");
}
for(int i = 0; i < DEFAULT_OUTGOING_WORKERS; i++)
_executor.execute(getClusterPduSendingTask());
// notification task itself in turn works as a task dispatcher
_executor.execute(getClusterPduNotificationTask());
Adapters<ClusterServiceAdapter> adapters = locator.getAdapters(ClusterServiceAdapter.class);
if (adapters == null || !adapters.isSet()) {
throw new ConfigurationException("Unable to get cluster service adapters");
}
Enumeration<ClusterServiceAdapter> it = adapters.enumeration();
if(it.hasMoreElements()) {
_currentServiceAdapter = it.nextElement();
}
if(_currentServiceAdapter == null) {
throw new ConfigurationException("Unable to set current cluster service adapter");
}
_agentLBEnabled = Boolean.valueOf(configDao.getValue(Config.AgentLbEnable.key()));
String connectedAgentsThreshold = configs.get("agent.load.threshold");
if (connectedAgentsThreshold != null) {
_connectedAgentsThreshold = Double.parseDouble(connectedAgentsThreshold);
}
this.registerListener(new LockMasterListener(_msId));
checkConflicts();
if(s_logger.isInfoEnabled()) {
s_logger.info("Cluster manager is configured.");
}
return true;
}
@Override
public long getManagementNodeId() {
return _msId;
}
@Override
public long getCurrentRunId() {
return _runId;
}
@Override
public boolean isManagementNodeAlive(long msid) {
ManagementServerHostVO mshost = _mshostDao.findByMsid(msid);
if(mshost != null) {
if(mshost.getLastUpdateTime().getTime() >= DateUtil.currentGMTTime().getTime() - _heartbeatThreshold) {
return true;
}
}
return false;
}
@Override
public boolean pingManagementNode(long msid) {
ManagementServerHostVO mshost = _mshostDao.findByMsid(msid);
if(mshost == null) {
return false;
}
return pingManagementNode(mshost);
}
private boolean pingManagementNode(ManagementServerHostVO mshost) {
String targetIp = mshost.getServiceIP();
if("127.0.0.1".equals(targetIp) || "0.0.0.0".equals(targetIp)) {
s_logger.info("ping management node cluster service can not be performed on self");
return false;
}
int retry = 10;
while (--retry > 0) {
SocketChannel sch = null;
try {
s_logger.info("Trying to connect to " + targetIp);
sch = SocketChannel.open();
sch.configureBlocking(true);
sch.socket().setSoTimeout(5000);
InetSocketAddress addr = new InetSocketAddress(targetIp, mshost.getServicePort());
sch.connect(addr);
return true;
} catch (IOException e) {
if (e instanceof ConnectException) {
s_logger.error("Unable to ping management server at " + targetIp + ":" + mshost.getServicePort() + " due to ConnectException", e);
return false;
}
} finally {
if (sch != null) {
try {
sch.close();
} catch (IOException e) {
}
}
}
try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
}
}
s_logger.error("Unable to ping management server at " + targetIp + ":" + mshost.getServicePort() + " after retries");
return false;
}
@Override
public int getHeartbeatThreshold() {
return this._heartbeatThreshold;
}
public int getHeartbeatInterval() {
return this._heartbeatInterval;
}
public void setHeartbeatThreshold(int threshold) {
_heartbeatThreshold = threshold;
}
private void checkConflicts() throws ConfigurationException {
Date cutTime = DateUtil.currentGMTTime();
List<ManagementServerHostVO> peers = _mshostDao.getActiveList(new Date(cutTime.getTime() - _heartbeatThreshold));
for(ManagementServerHostVO peer : peers) {
String peerIP = peer.getServiceIP().trim();
if(_clusterNodeIP.equals(peerIP)) {
if("127.0.0.1".equals(_clusterNodeIP)) {
if(pingManagementNode(peer.getMsid())) {
String msg = "Detected another management node with localhost IP is already running, please check your cluster configuration";
s_logger.error(msg);
throw new ConfigurationException(msg);
} else {
String msg = "Detected another management node with localhost IP is considered as running in DB, however it is not pingable, we will continue cluster initialization with this management server node";
s_logger.info(msg);
}
} else {
if(pingManagementNode(peer.getMsid())) {
String msg = "Detected that another management node with the same IP " + peer.getServiceIP() + " is already running, please check your cluster configuration";
s_logger.error(msg);
throw new ConfigurationException(msg);
} else {
String msg = "Detected that another management node with the same IP " + peer.getServiceIP()
+ " is considered as running in DB, however it is not pingable, we will continue cluster initialization with this management server node";
s_logger.info(msg);
}
}
}
}
}
@Override
public boolean rebalanceAgent(long agentId, Event event, long currentOwnerId, long futureOwnerId) throws AgentUnavailableException, OperationTimedoutException {
return _rebalanceService.executeRebalanceRequest(agentId, currentOwnerId, futureOwnerId, event);
}
@Override
public boolean isAgentRebalanceEnabled() {
return _agentLBEnabled;
}
@Override
public Boolean propagateResourceEvent(long agentId, ResourceState.Event event) throws AgentUnavailableException {
final String msPeer = getPeerName(agentId);
if (msPeer == null) {
return null;
}
if (s_logger.isDebugEnabled()) {
s_logger.debug("Propagating agent change request event:" + event.toString() + " to agent:" + agentId);
}
Command[] cmds = new Command[1];
cmds[0] = new PropagateResourceEventCommand(agentId, event);
Answer[] answers = execute(msPeer, agentId, cmds, true);
if (answers == null) {
throw new AgentUnavailableException(agentId);
}
if (s_logger.isDebugEnabled()) {
s_logger.debug("Result for agent change is " + answers[0].getResult());
}
return answers[0].getResult();
}
@Override
public boolean executeResourceUserRequest(long hostId, ResourceState.Event event) throws AgentUnavailableException {
return _resourceMgr.executeUserRequest(hostId, event);
}
}