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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.cluster;
import com.yahoo.concurrent.ThreadFactoryFactory;
import com.yahoo.search.result.ErrorMessage;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Monitors of a cluster of remote nodes.
* The monitor uses an internal thread for node monitoring.
* All <i>public</i> methods of this class are multithread safe.
*
* @author bratseth
*/
public class ClusterMonitor<T> {
private MonitorConfiguration configuration = new MonitorConfiguration();
private static Logger log=Logger.getLogger(ClusterMonitor.class.getName());
private NodeManager<T> nodeManager;
private MonitorThread monitorThread;
private volatile boolean shutdown = false;
/** A map from Node to corresponding MonitoredNode */
private final Map<T, BaseNodeMonitor<T>> nodeMonitors = Collections.synchronizedMap(new java.util.LinkedHashMap<>());
/** @deprecated use the constructor with just the first argument instead */
// TODO: Remove on Vespa 7
@Deprecated // OK
public ClusterMonitor(NodeManager<T> manager, String ignored) {
this(manager);
}
public ClusterMonitor(NodeManager<T> manager) {
nodeManager = manager;
monitorThread = new MonitorThread("search.clustermonitor");
monitorThread.start();
}
/** Returns the configuration of this cluster monitor */
public MonitorConfiguration getConfiguration() { return configuration; }
/**
* Adds a new node for monitoring.
* The object representing the node must
* <ul>
* <li>Have a sensible toString</li>
* <li>Have a sensible identity (equals and hashCode)</li>
* </ul>
*
* @param node the object representing the node
* @param internal whether or not this node is internal to this cluster
*/
public void add(T node, boolean internal) {
BaseNodeMonitor<T> monitor = new TrafficNodeMonitor<>(node, configuration, internal);
nodeMonitors.put(node, monitor);
}
/**
* Returns the monitor of the given node, or null if this node has not been added
*/
public BaseNodeMonitor<T> getNodeMonitor(T node) {
return nodeMonitors.get(node);
}
/** Called from ClusterSearcher/NodeManager when a node failed */
public synchronized void failed(T node, ErrorMessage error) {
BaseNodeMonitor<T> monitor = nodeMonitors.get(node);
boolean wasWorking = monitor.isWorking();
monitor.failed(error);
if (wasWorking && !monitor.isWorking()) {
nodeManager.failed(node);
}
}
/** Called when a node responded */
public synchronized void responded(T node) {
BaseNodeMonitor<T> monitor = nodeMonitors.get(node);
boolean wasFailing =! monitor.isWorking();
monitor.responded();
if (wasFailing && monitor.isWorking()) {
nodeManager.working(monitor.getNode());
}
}
/**
* Ping all nodes which needs pinging to discover state changes
*/
public void ping(Executor executor) {
for (Iterator<BaseNodeMonitor<T>> i = nodeMonitorIterator(); i.hasNext(); ) {
BaseNodeMonitor<T> monitor= i.next();
nodeManager.ping(monitor.getNode(), executor); // Cause call to failed or responded
}
nodeManager.pingIterationCompleted();
}
/** Returns a thread-safe snapshot of the NodeMonitors of all added nodes */
public Iterator<BaseNodeMonitor<T>> nodeMonitorIterator() {
return nodeMonitors().iterator();
}
/** Returns a thread-safe snapshot of the NodeMonitors of all added nodes */
public List<BaseNodeMonitor<T>> nodeMonitors() {
synchronized (nodeMonitors) {
return new java.util.ArrayList<>(nodeMonitors.values());
}
}
/** Must be called when this goes out of use */
public void shutdown() {
shutdown = true;
monitorThread.interrupt();
}
private class MonitorThread extends Thread {
MonitorThread(String name) {
super(name);
}
public void run() {
log.fine("Starting cluster monitor thread");
// Pings must happen in a separate thread from this to handle timeouts
// By using a cached thread pool we ensured that 1) a single thread will be used
// for all pings when there are no problems (important because it ensures that
// any thread local connections are reused) 2) a new thread will be started to execute
// new pings when a ping is not responding
Executor pingExecutor=Executors.newCachedThreadPool(ThreadFactoryFactory.getDaemonThreadFactory("search.ping"));
while (!isInterrupted()) {
try {
Thread.sleep(configuration.getCheckInterval());
log.finest("Activating ping");
ping(pingExecutor);
}
catch (Exception e) {
if (shutdown && e instanceof InterruptedException) {
break;
} else {
log.log(Level.WARNING,"Error in monitor thread",e);
}
}
}
log.fine("Stopped cluster monitor thread");
}
}
}
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