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The Multicast Discovery plugin allows discovery other nodes using multicast requests
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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.plugin.discovery.multicast;
import org.apache.lucene.util.Constants;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.SpecialPermission;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.BytesStreamOutput;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.network.NetworkService;
import org.elasticsearch.common.network.NetworkUtils;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.AbstractRunnable;
import org.elasticsearch.common.util.concurrent.EsRejectedExecutionException;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.discovery.zen.ping.PingContextProvider;
import org.elasticsearch.discovery.zen.ping.ZenPing;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.*;
import java.io.IOException;
import java.net.InetAddress;
import java.net.SocketAddress;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import static org.elasticsearch.cluster.node.DiscoveryNode.readNode;
import static org.elasticsearch.common.settings.Settings.Builder.EMPTY_SETTINGS;
import static org.elasticsearch.common.util.concurrent.ConcurrentCollections.newConcurrentMap;
/**
*
*/
public class MulticastZenPing extends AbstractLifecycleComponent implements ZenPing {
public static final String ACTION_NAME = "internal:discovery/zen/multicast";
private static final byte[] INTERNAL_HEADER = new byte[]{1, 9, 8, 4};
private static final int PING_SIZE_ESTIMATE = 150;
private final String address;
private final int port;
private final String group;
private final int bufferSize;
private final int ttl;
private final ThreadPool threadPool;
private final TransportService transportService;
private final ClusterName clusterName;
private final NetworkService networkService;
private final Version version;
private volatile PingContextProvider contextProvider;
private final boolean pingEnabled;
private volatile MulticastChannel multicastChannel;
private final AtomicInteger pingIdGenerator = new AtomicInteger();
private final Map receivedResponses = newConcurrentMap();
public MulticastZenPing(ThreadPool threadPool, TransportService transportService, ClusterName clusterName, Version version) {
this(EMPTY_SETTINGS, threadPool, transportService, clusterName, new NetworkService(EMPTY_SETTINGS), version);
}
@Inject
public MulticastZenPing(Settings settings, ThreadPool threadPool, TransportService transportService, ClusterName clusterName, NetworkService networkService, Version version) {
super(settings);
this.threadPool = threadPool;
this.transportService = transportService;
this.clusterName = clusterName;
this.networkService = networkService;
this.version = version;
this.address = this.settings.get("discovery.zen.ping.multicast.address");
this.port = this.settings.getAsInt("discovery.zen.ping.multicast.port", 54328);
this.group = this.settings.get("discovery.zen.ping.multicast.group", "224.2.2.4");
this.bufferSize = this.settings.getAsInt("discovery.zen.ping.multicast.buffer_size", 2048);
this.ttl = this.settings.getAsInt("discovery.zen.ping.multicast.ttl", 3);
this.pingEnabled = this.settings.getAsBoolean("discovery.zen.ping.multicast.ping.enabled", true);
logger.debug("using group [{}], with port [{}], ttl [{}], and address [{}]", group, port, ttl, address);
this.transportService.registerRequestHandler(ACTION_NAME, MulticastPingResponse.class, ThreadPool.Names.SAME, new MulticastPingResponseRequestHandler());
}
@Override
public void setPingContextProvider(PingContextProvider nodesProvider) {
if (lifecycle.started()) {
throw new IllegalStateException("Can't set nodes provider when started");
}
this.contextProvider = nodesProvider;
}
@Override
protected void doStart() {
try {
// we know OSX has bugs in the JVM when creating multiple instances of multicast sockets
// causing for "socket close" exceptions when receive and/or crashes
final boolean shared = settings.getAsBoolean("discovery.zen.ping.multicast.shared", Constants.MAC_OS_X);
// OSX does not correctly send multicasts FROM the right interface
boolean deferToInterface = settings.getAsBoolean("discovery.zen.ping.multicast.defer_group_to_set_interface", Constants.MAC_OS_X);
// don't use publish address, the use case for that is e.g. a firewall or proxy and
// may not even be bound to an interface on this machine! use the first bound address.
List addresses = Arrays.asList(networkService.resolveBindHostAddresses(address == null ? null : new String[] { address }));
NetworkUtils.sortAddresses(addresses);
final MulticastChannel.Config config = new MulticastChannel.Config(port, group, bufferSize, ttl,
addresses.get(0), deferToInterface);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new SpecialPermission());
}
multicastChannel = AccessController.doPrivileged(new PrivilegedExceptionAction() {
@Override
public MulticastChannel run() throws Exception {
return MulticastChannel.getChannel(nodeName(), shared, config, new Receiver());
}
});
} catch (Throwable t) {
String msg = "multicast failed to start [{}], disabling. Consider using IPv4 only (by defining env. variable `ES_USE_IPV4`)";
logger.info(msg, t, ExceptionsHelper.detailedMessage(t));
}
}
@Override
protected void doStop() {
if (multicastChannel != null) {
multicastChannel.close();
multicastChannel = null;
}
}
@Override
protected void doClose() {
}
public PingResponse[] pingAndWait(TimeValue timeout) {
final AtomicReference response = new AtomicReference<>();
final CountDownLatch latch = new CountDownLatch(1);
try {
ping(new PingListener() {
@Override
public void onPing(PingResponse[] pings) {
response.set(pings);
latch.countDown();
}
}, timeout);
} catch (EsRejectedExecutionException ex) {
logger.debug("Ping execution rejected", ex);
return PingResponse.EMPTY;
}
try {
latch.await();
return response.get();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return PingResponse.EMPTY;
}
}
@Override
public void ping(final PingListener listener, final TimeValue timeout) {
if (!pingEnabled || multicastChannel == null) {
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
listener.onPing(PingResponse.EMPTY);
}
});
return;
}
final int id = pingIdGenerator.incrementAndGet();
try {
receivedResponses.put(id, new PingCollection());
sendPingRequest(id);
// try and send another ping request halfway through (just in case someone woke up during it...)
// this can be a good trade-off to nailing the initial lookup or un-delivered messages
threadPool.schedule(TimeValue.timeValueMillis(timeout.millis() / 2), ThreadPool.Names.GENERIC, new AbstractRunnable() {
@Override
public void onFailure(Throwable t) {
logger.warn("[{}] failed to send second ping request", t, id);
finalizePingCycle(id, listener);
}
@Override
public void doRun() {
sendPingRequest(id);
threadPool.schedule(TimeValue.timeValueMillis(timeout.millis() / 2), ThreadPool.Names.GENERIC, new AbstractRunnable() {
@Override
public void onFailure(Throwable t) {
logger.warn("[{}] failed to send third ping request", t, id);
finalizePingCycle(id, listener);
}
@Override
public void doRun() {
// make one last ping, but finalize as soon as all nodes have responded or a timeout has past
PingCollection collection = receivedResponses.get(id);
FinalizingPingCollection finalizingPingCollection = new FinalizingPingCollection(id, collection, collection.size(), listener);
receivedResponses.put(id, finalizingPingCollection);
logger.trace("[{}] sending last pings", id);
sendPingRequest(id);
threadPool.schedule(TimeValue.timeValueMillis(timeout.millis() / 4), ThreadPool.Names.GENERIC, new AbstractRunnable() {
@Override
public void onFailure(Throwable t) {
logger.warn("[{}] failed to finalize ping", t, id);
}
@Override
protected void doRun() throws Exception {
finalizePingCycle(id, listener);
}
});
}
});
}
});
} catch (Exception e) {
logger.warn("failed to ping", e);
finalizePingCycle(id, listener);
}
}
/**
* takes all pings collected for a given id and pass them to the given listener.
* this method is safe to call multiple times as is guaranteed to only finalize once.
*/
private void finalizePingCycle(int id, final PingListener listener) {
PingCollection responses = receivedResponses.remove(id);
if (responses != null) {
listener.onPing(responses.toArray());
}
}
private void sendPingRequest(int id) {
try {
BytesStreamOutput out = new BytesStreamOutput(PING_SIZE_ESTIMATE);
out.writeBytes(INTERNAL_HEADER);
// TODO: change to min_required version!
Version.writeVersion(version, out);
out.writeInt(id);
clusterName.writeTo(out);
contextProvider.nodes().localNode().writeTo(out);
out.close();
multicastChannel.send(out.bytes());
if (logger.isTraceEnabled()) {
logger.trace("[{}] sending ping request", id);
}
} catch (Exception e) {
if (lifecycle.stoppedOrClosed()) {
return;
}
if (logger.isDebugEnabled()) {
logger.debug("failed to send multicast ping request", e);
} else {
logger.warn("failed to send multicast ping request: {}", ExceptionsHelper.detailedMessage(e));
}
}
}
class FinalizingPingCollection extends PingCollection {
final private PingCollection internalCollection;
final private int expectedResponses;
final private AtomicInteger responseCount;
final private PingListener listener;
final private int id;
public FinalizingPingCollection(int id, PingCollection internalCollection, int expectedResponses, PingListener listener) {
this.id = id;
this.internalCollection = internalCollection;
this.expectedResponses = expectedResponses;
this.responseCount = new AtomicInteger();
this.listener = listener;
}
@Override
public synchronized boolean addPing(PingResponse ping) {
if (internalCollection.addPing(ping)) {
if (responseCount.incrementAndGet() >= expectedResponses) {
logger.trace("[{}] all nodes responded", id);
finish();
}
return true;
}
return false;
}
@Override
public synchronized void addPings(PingResponse[] pings) {
internalCollection.addPings(pings);
}
@Override
public synchronized PingResponse[] toArray() {
return internalCollection.toArray();
}
void finish() {
// spawn another thread as we may be running on a network thread
threadPool.generic().execute(new AbstractRunnable() {
@Override
public void onFailure(Throwable t) {
logger.error("failed to call ping listener", t);
}
@Override
protected void doRun() throws Exception {
finalizePingCycle(id, listener);
}
});
}
}
class MulticastPingResponseRequestHandler extends TransportRequestHandler {
@Override
public void messageReceived(MulticastPingResponse request, TransportChannel channel) throws Exception {
if (logger.isTraceEnabled()) {
logger.trace("[{}] received {}", request.id, request.pingResponse);
}
PingCollection responses = receivedResponses.get(request.id);
if (responses == null) {
logger.warn("received ping response {} with no matching id [{}]", request.pingResponse, request.id);
} else {
responses.addPing(request.pingResponse);
}
channel.sendResponse(TransportResponse.Empty.INSTANCE);
}
}
public static class MulticastPingResponse extends TransportRequest {
int id;
PingResponse pingResponse;
public MulticastPingResponse() {
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
id = in.readInt();
pingResponse = PingResponse.readPingResponse(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
out.writeInt(id);
pingResponse.writeTo(out);
}
}
private class Receiver implements MulticastChannel.Listener {
@Override
public void onMessage(BytesReference data, SocketAddress address) {
int id = -1;
DiscoveryNode requestingNodeX = null;
ClusterName clusterName = null;
Map externalPingData = null;
XContentType xContentType = null;
try {
boolean internal = false;
if (data.length() > 4) {
int counter = 0;
for (; counter < INTERNAL_HEADER.length; counter++) {
if (data.get(counter) != INTERNAL_HEADER[counter]) {
break;
}
}
if (counter == INTERNAL_HEADER.length) {
internal = true;
}
}
if (internal) {
StreamInput input = StreamInput.wrap(new BytesArray(data.toBytes(), INTERNAL_HEADER.length, data.length() - INTERNAL_HEADER.length));
Version version = Version.readVersion(input);
input.setVersion(version);
id = input.readInt();
clusterName = ClusterName.readClusterName(input);
requestingNodeX = readNode(input);
} else {
xContentType = XContentFactory.xContentType(data);
if (xContentType != null) {
// an external ping
try (XContentParser parser = XContentFactory.xContent(xContentType).createParser(data)) {
externalPingData = parser.map();
}
} else {
throw new IllegalStateException("failed multicast message, probably message from previous version");
}
}
if (externalPingData != null) {
handleExternalPingRequest(externalPingData, xContentType, address);
} else {
handleNodePingRequest(id, requestingNodeX, clusterName);
}
} catch (Exception e) {
if (!lifecycle.started() || (e instanceof EsRejectedExecutionException)) {
logger.debug("failed to read requesting data from {}", e, address);
} else {
logger.warn("failed to read requesting data from {}", e, address);
}
}
}
@SuppressWarnings("unchecked")
private void handleExternalPingRequest(Map externalPingData, XContentType contentType, SocketAddress remoteAddress) {
if (externalPingData.containsKey("response")) {
// ignoring responses sent over the multicast channel
logger.trace("got an external ping response (ignoring) from {}, content {}", remoteAddress, externalPingData);
return;
}
if (multicastChannel == null) {
logger.debug("can't send ping response, no socket, from {}, content {}", remoteAddress, externalPingData);
return;
}
Map request = (Map) externalPingData.get("request");
if (request == null) {
logger.warn("malformed external ping request, no 'request' element from {}, content {}", remoteAddress, externalPingData);
return;
}
final String requestClusterName = request.containsKey("cluster_name") ? request.get("cluster_name").toString() : request.containsKey("clusterName") ? request.get("clusterName").toString() : null;
if (requestClusterName == null) {
logger.warn("malformed external ping request, missing 'cluster_name' element within request, from {}, content {}", remoteAddress, externalPingData);
return;
}
if (!requestClusterName.equals(clusterName.value())) {
logger.trace("got request for cluster_name {}, but our cluster_name is {}, from {}, content {}",
requestClusterName, clusterName.value(), remoteAddress, externalPingData);
return;
}
if (logger.isTraceEnabled()) {
logger.trace("got external ping request from {}, content {}", remoteAddress, externalPingData);
}
try {
DiscoveryNode localNode = contextProvider.nodes().localNode();
XContentBuilder builder = XContentFactory.contentBuilder(contentType);
builder.startObject().startObject("response");
builder.field("cluster_name", clusterName.value());
builder.startObject("version").field("number", version.number()).field("snapshot_build", version.snapshot).endObject();
builder.field("transport_address", localNode.address().toString());
if (contextProvider.nodeService() != null) {
for (Map.Entry attr : contextProvider.nodeService().attributes().entrySet()) {
builder.field(attr.getKey(), attr.getValue());
}
}
builder.startObject("attributes");
for (Map.Entry attr : localNode.attributes().entrySet()) {
builder.field(attr.getKey(), attr.getValue());
}
builder.endObject();
builder.endObject().endObject();
multicastChannel.send(builder.bytes());
if (logger.isTraceEnabled()) {
logger.trace("sending external ping response {}", builder.string());
}
} catch (Exception e) {
logger.warn("failed to send external multicast response", e);
}
}
private void handleNodePingRequest(int id, DiscoveryNode requestingNodeX, ClusterName requestClusterName) {
if (!pingEnabled || multicastChannel == null) {
return;
}
final DiscoveryNodes discoveryNodes = contextProvider.nodes();
final DiscoveryNode requestingNode = requestingNodeX;
if (requestingNode.id().equals(discoveryNodes.localNodeId())) {
// that's me, ignore
return;
}
if (!requestClusterName.equals(clusterName)) {
if (logger.isTraceEnabled()) {
logger.trace("[{}] received ping_request from [{}], but wrong cluster_name [{}], expected [{}], ignoring",
id, requestingNode, requestClusterName.value(), clusterName.value());
}
return;
}
// don't connect between two client nodes, no need for that...
if (!discoveryNodes.localNode().shouldConnectTo(requestingNode)) {
if (logger.isTraceEnabled()) {
logger.trace("[{}] received ping_request from [{}], both are client nodes, ignoring", id, requestingNode, requestClusterName);
}
return;
}
final MulticastPingResponse multicastPingResponse = new MulticastPingResponse();
multicastPingResponse.id = id;
multicastPingResponse.pingResponse = new PingResponse(discoveryNodes.localNode(), discoveryNodes.masterNode(), clusterName, contextProvider.nodeHasJoinedClusterOnce());
if (logger.isTraceEnabled()) {
logger.trace("[{}] received ping_request from [{}], sending {}", id, requestingNode, multicastPingResponse.pingResponse);
}
if (!transportService.nodeConnected(requestingNode)) {
// do the connect and send on a thread pool
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
// connect to the node if possible
try {
transportService.connectToNode(requestingNode);
transportService.sendRequest(requestingNode, ACTION_NAME, multicastPingResponse, new EmptyTransportResponseHandler(ThreadPool.Names.SAME) {
@Override
public void handleException(TransportException exp) {
logger.warn("failed to receive confirmation on sent ping response to [{}]", exp, requestingNode);
}
});
} catch (Exception e) {
if (lifecycle.started()) {
logger.warn("failed to connect to requesting node {}", e, requestingNode);
}
}
}
});
} else {
transportService.sendRequest(requestingNode, ACTION_NAME, multicastPingResponse, new EmptyTransportResponseHandler(ThreadPool.Names.SAME) {
@Override
public void handleException(TransportException exp) {
if (lifecycle.started()) {
logger.warn("failed to receive confirmation on sent ping response to [{}]", exp, requestingNode);
}
}
});
}
}
}
}
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