| /** |
| * 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 org.apache.ambari.server.agent; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeMap; |
| |
| import org.apache.ambari.server.AmbariException; |
| import org.apache.ambari.server.actionmanager.ActionManager; |
| import org.apache.ambari.server.state.Cluster; |
| import org.apache.ambari.server.state.Clusters; |
| import org.apache.ambari.server.state.Config; |
| import org.apache.ambari.server.state.Host; |
| import org.apache.ambari.server.state.HostState; |
| import org.apache.ambari.server.state.ServiceComponentHost; |
| import org.apache.ambari.server.state.fsm.InvalidStateTransitionException; |
| import org.apache.ambari.server.state.host.HostHeartbeatLostEvent; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * Monitors the node state and heartbeats. |
| */ |
| public class HeartbeatMonitor implements Runnable { |
| private static Log LOG = LogFactory.getLog(HeartbeatMonitor.class); |
| private Clusters fsm; |
| private ActionQueue actionQueue; |
| private ActionManager actionManager; |
| private final int threadWakeupInterval; //1 minute |
| private volatile boolean shouldRun = true; |
| private Thread monitorThread = null; |
| |
| public HeartbeatMonitor(Clusters fsm, ActionQueue aq, ActionManager am, |
| int threadWakeupInterval) { |
| this.fsm = fsm; |
| this.actionQueue = aq; |
| this.actionManager = am; |
| this.threadWakeupInterval = threadWakeupInterval; |
| } |
| |
| public void shutdown() { |
| shouldRun = false; |
| } |
| |
| public void start() { |
| monitorThread = new Thread(this); |
| monitorThread.start(); |
| } |
| |
| void join(long millis) throws InterruptedException { |
| monitorThread.join(millis); |
| } |
| |
| public boolean isAlive() { |
| return monitorThread.isAlive(); |
| } |
| |
| @Override |
| public void run() { |
| while (shouldRun) { |
| try { |
| Thread.sleep(threadWakeupInterval); |
| doWork(); |
| } catch (InterruptedException ex) { |
| LOG.warn("Scheduler thread is interrupted going to stop", ex); |
| shouldRun = false; |
| } catch (Exception ex) { |
| LOG.warn("Exception received", ex); |
| } catch (Throwable t) { |
| LOG.warn("ERROR", t); |
| } |
| } |
| } |
| |
| //Go through all the nodes, check for last heartbeat or any waiting state |
| //If heartbeat is lost, update node fsm state, purge the action queue |
| //notify action manager for node failure. |
| private void doWork() throws InvalidStateTransitionException, AmbariException { |
| List<Host> allHosts = fsm.getHosts(); |
| long now = System.currentTimeMillis(); |
| for (Host hostObj : allHosts) { |
| String host = hostObj.getHostName(); |
| HostState hostState = hostObj.getState(); |
| String hostname = hostObj.getHostName(); |
| |
| long lastHeartbeat = 0; |
| try { |
| lastHeartbeat = fsm.getHost(host).getLastHeartbeatTime(); |
| } catch (AmbariException e) { |
| LOG.warn("Exception in getting host object; Is it fatal?", e); |
| } |
| if (lastHeartbeat + 5*threadWakeupInterval < now) { |
| LOG.warn("Hearbeat lost from host "+host); |
| //Heartbeat is expired |
| hostObj.handleEvent(new HostHeartbeatLostEvent(host)); |
| //Purge action queue |
| actionQueue.dequeueAll(host); |
| //notify action manager |
| actionManager.handleLostHost(host); |
| } |
| if (hostState == HostState.WAITING_FOR_HOST_STATUS_UPDATES) { |
| long timeSpentInState = hostObj.getTimeInState(); |
| if (timeSpentInState + 5*threadWakeupInterval < now) { |
| //Go back to init, the agent will be asked to register again in the next heartbeat |
| LOG.warn("timeSpentInState + 5*threadWakeupInterval < now, Go back to init"); |
| hostObj.setState(HostState.INIT); |
| } |
| } |
| |
| // Get status of service components |
| List<StatusCommand> cmds = generateStatusCommands(hostname); |
| if (cmds.isEmpty()) { |
| // Nothing to do |
| } else { |
| for (StatusCommand command : cmds) { |
| actionQueue.enqueue(hostname, command); |
| } |
| } |
| } |
| } |
| |
| /** |
| * @param hostname |
| * @return list of commands to get status of service components on a concrete host |
| */ |
| public List<StatusCommand> generateStatusCommands(String hostname) throws AmbariException { |
| List<StatusCommand> cmds = new ArrayList<StatusCommand>(); |
| for (Cluster cl : fsm.getClustersForHost(hostname)) { |
| List<ServiceComponentHost> roleList = cl |
| .getServiceComponentHosts(hostname); |
| for (ServiceComponentHost sch : roleList) { |
| String serviceName = sch.getServiceName(); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Live status will include status of service " + serviceName + |
| " of cluster " + cl.getClusterName()); |
| } |
| |
| Map<String, Config> configs = sch.getDesiredConfigs(); |
| |
| Map<String, Map<String, String>> configurations = |
| new TreeMap<String, Map<String, String>>(); |
| |
| for (Config config : configs.values()) { |
| if (config.getType().equals("global")) |
| configurations.put(config.getType(), |
| config.getProperties()); |
| } |
| |
| StatusCommand statusCmd = new StatusCommand(); |
| statusCmd.setClusterName(cl.getClusterName()); |
| statusCmd.setServiceName(serviceName); |
| statusCmd.setComponentName(sch.getServiceComponentName()); |
| statusCmd.setConfigurations(configurations); |
| cmds.add(statusCmd); |
| } |
| } |
| return cmds; |
| } |
| } |