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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.discovery.zen;
import com.carrotsearch.hppc.cursors.ObjectCursor;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.apache.logging.log4j.util.Supplier;
import org.apache.lucene.store.AlreadyClosedException;
import org.apache.lucene.util.IOUtils;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.lease.Releasable;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.CollectionUtils;
import org.elasticsearch.common.util.concurrent.AbstractRunnable;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor;
import org.elasticsearch.common.util.concurrent.KeyedLock;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.ConnectTransportException;
import org.elasticsearch.transport.ConnectionProfile;
import org.elasticsearch.transport.NodeNotConnectedException;
import org.elasticsearch.transport.RemoteTransportException;
import org.elasticsearch.transport.Transport.Connection;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportException;
import org.elasticsearch.transport.TransportRequest;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportRequestOptions;
import org.elasticsearch.transport.TransportResponse;
import org.elasticsearch.transport.TransportResponseHandler;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.Collections.emptyList;
import static java.util.Collections.emptyMap;
import static java.util.Collections.emptySet;
import static org.elasticsearch.common.util.concurrent.ConcurrentCollections.newConcurrentMap;
import static org.elasticsearch.discovery.zen.ZenPing.PingResponse.readPingResponse;
public class UnicastZenPing extends AbstractComponent implements ZenPing {
public static final String ACTION_NAME = "internal:discovery/zen/unicast";
public static final Setting<List<String>> DISCOVERY_ZEN_PING_UNICAST_HOSTS_SETTING =
Setting.listSetting("discovery.zen.ping.unicast.hosts", emptyList(), Function.identity(),
Property.NodeScope);
public static final Setting<Integer> DISCOVERY_ZEN_PING_UNICAST_CONCURRENT_CONNECTS_SETTING =
Setting.intSetting("discovery.zen.ping.unicast.concurrent_connects", 10, 0, Property.NodeScope);
public static final Setting<TimeValue> DISCOVERY_ZEN_PING_UNICAST_HOSTS_RESOLVE_TIMEOUT =
Setting.positiveTimeSetting("discovery.zen.ping.unicast.hosts.resolve_timeout", TimeValue.timeValueSeconds(5), Property.NodeScope);
// these limits are per-address
public static final int LIMIT_FOREIGN_PORTS_COUNT = 1;
public static final int LIMIT_LOCAL_PORTS_COUNT = 5;
private final ThreadPool threadPool;
private final TransportService transportService;
private final ClusterName clusterName;
private final List<String> configuredHosts;
private final int limitPortCounts;
private final PingContextProvider contextProvider;
private final AtomicInteger pingingRoundIdGenerator = new AtomicInteger();
// used as a node id prefix for configured unicast host nodes/address
private static final String UNICAST_NODE_PREFIX = "#zen_unicast_";
private final Map<Integer, PingingRound> activePingingRounds = newConcurrentMap();
// a list of temporal responses a node will return for a request (holds responses from other nodes)
private final Queue<PingResponse> temporalResponses = ConcurrentCollections.newQueue();
private final UnicastHostsProvider hostsProvider;
protected final EsThreadPoolExecutor unicastZenPingExecutorService;
private final TimeValue resolveTimeout;
private volatile boolean closed = false;
public UnicastZenPing(Settings settings, ThreadPool threadPool, TransportService transportService,
UnicastHostsProvider unicastHostsProvider, PingContextProvider contextProvider) {
super(settings);
this.threadPool = threadPool;
this.transportService = transportService;
this.clusterName = ClusterName.CLUSTER_NAME_SETTING.get(settings);
this.hostsProvider = unicastHostsProvider;
this.contextProvider = contextProvider;
final int concurrentConnects = DISCOVERY_ZEN_PING_UNICAST_CONCURRENT_CONNECTS_SETTING.get(settings);
if (DISCOVERY_ZEN_PING_UNICAST_HOSTS_SETTING.exists(settings)) {
configuredHosts = DISCOVERY_ZEN_PING_UNICAST_HOSTS_SETTING.get(settings);
// we only limit to 1 addresses, makes no sense to ping 100 ports
limitPortCounts = LIMIT_FOREIGN_PORTS_COUNT;
} else {
// if unicast hosts are not specified, fill with simple defaults on the local machine
configuredHosts = transportService.getLocalAddresses();
limitPortCounts = LIMIT_LOCAL_PORTS_COUNT;
}
resolveTimeout = DISCOVERY_ZEN_PING_UNICAST_HOSTS_RESOLVE_TIMEOUT.get(settings);
logger.debug(
"using initial hosts {}, with concurrent_connects [{}], resolve_timeout [{}]",
configuredHosts,
concurrentConnects,
resolveTimeout);
transportService.registerRequestHandler(ACTION_NAME, UnicastPingRequest::new, ThreadPool.Names.SAME,
new UnicastPingRequestHandler());
final ThreadFactory threadFactory = EsExecutors.daemonThreadFactory(settings, "[unicast_connect]");
unicastZenPingExecutorService = EsExecutors.newScaling(
"unicast_connect",
0, concurrentConnects,
60,
TimeUnit.SECONDS,
threadFactory,
threadPool.getThreadContext());
}
/**
* Resolves a list of hosts to a list of discovery nodes. Each host is resolved into a transport address (or a collection of addresses
* if the number of ports is greater than one) and the transport addresses are used to created discovery nodes. Host lookups are done
* in parallel using specified executor service up to the specified resolve timeout.
*
* @param executorService the executor service used to parallelize hostname lookups
* @param logger logger used for logging messages regarding hostname lookups
* @param hosts the hosts to resolve
* @param limitPortCounts the number of ports to resolve (should be 1 for non-local transport)
* @param transportService the transport service
* @param nodeId_prefix a prefix to use for node ids
* @param resolveTimeout the timeout before returning from hostname lookups
* @return a list of discovery nodes with resolved transport addresses
*/
public static List<DiscoveryNode> resolveHostsLists(
final ExecutorService executorService,
final Logger logger,
final List<String> hosts,
final int limitPortCounts,
final TransportService transportService,
final String nodeId_prefix,
final TimeValue resolveTimeout) throws InterruptedException {
Objects.requireNonNull(executorService);
Objects.requireNonNull(logger);
Objects.requireNonNull(hosts);
Objects.requireNonNull(transportService);
Objects.requireNonNull(nodeId_prefix);
Objects.requireNonNull(resolveTimeout);
if (resolveTimeout.nanos() < 0) {
throw new IllegalArgumentException("resolve timeout must be non-negative but was [" + resolveTimeout + "]");
}
// create tasks to submit to the executor service; we will wait up to resolveTimeout for these tasks to complete
final List<Callable<TransportAddress[]>> callables =
hosts
.stream()
.map(hn -> (Callable<TransportAddress[]>) () -> transportService.addressesFromString(hn, limitPortCounts))
.collect(Collectors.toList());
final List<Future<TransportAddress[]>> futures =
executorService.invokeAll(callables, resolveTimeout.nanos(), TimeUnit.NANOSECONDS);
final List<DiscoveryNode> discoveryNodes = new ArrayList<>();
final Set<TransportAddress> localAddresses = new HashSet<>();
localAddresses.add(transportService.boundAddress().publishAddress());
localAddresses.addAll(Arrays.asList(transportService.boundAddress().boundAddresses()));
// ExecutorService#invokeAll guarantees that the futures are returned in the iteration order of the tasks so we can associate the
// hostname with the corresponding task by iterating together
final Iterator<String> it = hosts.iterator();
for (final Future<TransportAddress[]> future : futures) {
final String hostname = it.next();
if (!future.isCancelled()) {
assert future.isDone();
try {
final TransportAddress[] addresses = future.get();
logger.trace("resolved host [{}] to {}", hostname, addresses);
for (int addressId = 0; addressId < addresses.length; addressId++) {
final TransportAddress address = addresses[addressId];
// no point in pinging ourselves
if (localAddresses.contains(address) == false) {
discoveryNodes.add(
new DiscoveryNode(
nodeId_prefix + hostname + "_" + addressId + "#",
address,
emptyMap(),
emptySet(),
Version.CURRENT.minimumCompatibilityVersion()));
}
}
} catch (final ExecutionException e) {
assert e.getCause() != null;
final String message = "failed to resolve host [" + hostname + "]";
logger.warn(message, e.getCause());
}
} else {
logger.warn("timed out after [{}] resolving host [{}]", resolveTimeout, hostname);
}
}
return discoveryNodes;
}
@Override
public void close() {
ThreadPool.terminate(unicastZenPingExecutorService, 10, TimeUnit.SECONDS);
Releasables.close(activePingingRounds.values());
closed = true;
}
@Override
public void start() {
}
/**
* Clears the list of cached ping responses.
*/
public void clearTemporalResponses() {
temporalResponses.clear();
}
/**
* Sends three rounds of pings notifying the specified {@link Consumer} when pinging is complete. Pings are sent after resolving
* configured unicast hosts to their IP address (subject to DNS caching within the JVM). A batch of pings is sent, then another batch
* of pings is sent at half the specified {@link TimeValue}, and then another batch of pings is sent at the specified {@link TimeValue}.
* The pings that are sent carry a timeout of 1.25 times the specified {@link TimeValue}. When pinging each node, a connection and
* handshake is performed, with a connection timeout of the specified {@link TimeValue}.
*
* @param resultsConsumer the callback when pinging is complete
* @param duration the timeout for various components of the pings
*/
@Override
public void ping(final Consumer<PingCollection> resultsConsumer, final TimeValue duration) {
ping(resultsConsumer, duration, duration);
}
/**
* a variant of {@link #ping(Consumer, TimeValue)}, but allows separating the scheduling duration
* from the duration used for request level time outs. This is useful for testing
*/
protected void ping(final Consumer<PingCollection> resultsConsumer,
final TimeValue scheduleDuration,
final TimeValue requestDuration) {
final List<DiscoveryNode> seedNodes;
try {
seedNodes = resolveHostsLists(
unicastZenPingExecutorService,
logger,
configuredHosts,
limitPortCounts,
transportService,
UNICAST_NODE_PREFIX,
resolveTimeout);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
seedNodes.addAll(hostsProvider.buildDynamicNodes());
final DiscoveryNodes nodes = contextProvider.clusterState().nodes();
// add all possible master nodes that were active in the last known cluster configuration
for (ObjectCursor<DiscoveryNode> masterNode : nodes.getMasterNodes().values()) {
seedNodes.add(masterNode.value);
}
final ConnectionProfile connectionProfile =
ConnectionProfile.buildSingleChannelProfile(TransportRequestOptions.Type.REG, requestDuration, requestDuration);
final PingingRound pingingRound = new PingingRound(pingingRoundIdGenerator.incrementAndGet(), seedNodes, resultsConsumer,
nodes.getLocalNode(), connectionProfile);
activePingingRounds.put(pingingRound.id(), pingingRound);
final AbstractRunnable pingSender = new AbstractRunnable() {
@Override
public void onFailure(Exception e) {
if (e instanceof AlreadyClosedException == false) {
logger.warn("unexpected error while pinging", e);
}
}
@Override
protected void doRun() throws Exception {
sendPings(requestDuration, pingingRound);
}
};
threadPool.generic().execute(pingSender);
threadPool.schedule(TimeValue.timeValueMillis(scheduleDuration.millis() / 3), ThreadPool.Names.GENERIC, pingSender);
threadPool.schedule(TimeValue.timeValueMillis(scheduleDuration.millis() / 3 * 2), ThreadPool.Names.GENERIC, pingSender);
threadPool.schedule(scheduleDuration, ThreadPool.Names.GENERIC, new AbstractRunnable() {
@Override
protected void doRun() throws Exception {
finishPingingRound(pingingRound);
}
@Override
public void onFailure(Exception e) {
logger.warn("unexpected error while finishing pinging round", e);
}
});
}
// for testing
protected void finishPingingRound(PingingRound pingingRound) {
pingingRound.close();
}
protected class PingingRound implements Releasable {
private final int id;
private final Map<TransportAddress, Connection> tempConnections = new HashMap<>();
private final KeyedLock<TransportAddress> connectionLock = new KeyedLock<>(true);
private final PingCollection pingCollection;
private final List<DiscoveryNode> seedNodes;
private final Consumer<PingCollection> pingListener;
private final DiscoveryNode localNode;
private final ConnectionProfile connectionProfile;
private AtomicBoolean closed = new AtomicBoolean(false);
PingingRound(int id, List<DiscoveryNode> seedNodes, Consumer<PingCollection> resultsConsumer, DiscoveryNode localNode,
ConnectionProfile connectionProfile) {
this.id = id;
this.seedNodes = Collections.unmodifiableList(new ArrayList<>(seedNodes));
this.pingListener = resultsConsumer;
this.localNode = localNode;
this.connectionProfile = connectionProfile;
this.pingCollection = new PingCollection();
}
public int id() {
return this.id;
}
public boolean isClosed() {
return this.closed.get();
}
public List<DiscoveryNode> getSeedNodes() {
ensureOpen();
return seedNodes;
}
public Connection getOrConnect(DiscoveryNode node) throws IOException {
Connection result;
try (Releasable ignore = connectionLock.acquire(node.getAddress())) {
result = tempConnections.get(node.getAddress());
if (result == null) {
ensureOpen();
boolean success = false;
logger.trace("[{}] opening connection to [{}]", id(), node);
result = transportService.openConnection(node, connectionProfile);
try {
transportService.handshake(result, connectionProfile.getHandshakeTimeout().millis());
synchronized (this) {
// acquire lock and check if closed, to prevent leaving an open connection after closing
ensureOpen();
Connection existing = tempConnections.put(node.getAddress(), result);
assert existing == null;
success = true;
}
} finally {
if (success == false) {
logger.trace("[{}] closing connection to [{}] due to failure", id(), node);
IOUtils.closeWhileHandlingException(result);
}
}
}
}
return result;
}
private void ensureOpen() {
if (isClosed()) {
throw new AlreadyClosedException("pinging round [" + id + "] is finished");
}
}
public void addPingResponseToCollection(PingResponse pingResponse) {
if (localNode.equals(pingResponse.node()) == false) {
pingCollection.addPing(pingResponse);
}
}
@Override
public void close() {
List<Connection> toClose = null;
synchronized (this) {
if (closed.compareAndSet(false, true)) {
activePingingRounds.remove(id);
toClose = new ArrayList<>(tempConnections.values());
tempConnections.clear();
}
}
if (toClose != null) {
// we actually closed
try {
pingListener.accept(pingCollection);
} finally {
IOUtils.closeWhileHandlingException(toClose);
}
}
}
public ConnectionProfile getConnectionProfile() {
return connectionProfile;
}
}
protected void sendPings(final TimeValue timeout, final PingingRound pingingRound) {
final UnicastPingRequest pingRequest = new UnicastPingRequest();
pingRequest.id = pingingRound.id();
pingRequest.timeout = timeout;
ClusterState lastState = contextProvider.clusterState();
pingRequest.pingResponse = createPingResponse(lastState);
Set<DiscoveryNode> nodesFromResponses = temporalResponses.stream().map(pingResponse -> {
assert clusterName.equals(pingResponse.clusterName()) :
"got a ping request from a different cluster. expected " + clusterName + " got " + pingResponse.clusterName();
return pingResponse.node();
}).collect(Collectors.toSet());
// dedup by address
final Map<TransportAddress, DiscoveryNode> uniqueNodesByAddress =
Stream.concat(pingingRound.getSeedNodes().stream(), nodesFromResponses.stream())
.collect(Collectors.toMap(DiscoveryNode::getAddress, Function.identity(), (n1, n2) -> n1));
// resolve what we can via the latest cluster state
final Set<DiscoveryNode> nodesToPing = uniqueNodesByAddress.values().stream()
.map(node -> {
DiscoveryNode foundNode = lastState.nodes().findByAddress(node.getAddress());
if (foundNode == null) {
return node;
} else {
return foundNode;
}
}).collect(Collectors.toSet());
nodesToPing.forEach(node -> sendPingRequestToNode(node, timeout, pingingRound, pingRequest));
}
private void sendPingRequestToNode(final DiscoveryNode node, TimeValue timeout, final PingingRound pingingRound,
final UnicastPingRequest pingRequest) {
submitToExecutor(new AbstractRunnable() {
@Override
protected void doRun() throws Exception {
Connection connection = null;
if (transportService.nodeConnected(node)) {
try {
// concurrency can still cause disconnects
connection = transportService.getConnection(node);
} catch (NodeNotConnectedException e) {
logger.trace("[{}] node [{}] just disconnected, will create a temp connection", pingingRound.id(), node);
}
}
if (connection == null) {
connection = pingingRound.getOrConnect(node);
}
logger.trace("[{}] sending to {}", pingingRound.id(), node);
transportService.sendRequest(connection, ACTION_NAME, pingRequest,
TransportRequestOptions.builder().withTimeout((long) (timeout.millis() * 1.25)).build(),
getPingResponseHandler(pingingRound, node));
}
@Override
public void onFailure(Exception e) {
if (e instanceof ConnectTransportException || e instanceof AlreadyClosedException) {
// can't connect to the node - this is more common path!
logger.trace(
(Supplier<?>) () -> new ParameterizedMessage(
"[{}] failed to ping {}", pingingRound.id(), node), e);
} else if (e instanceof RemoteTransportException) {
// something went wrong on the other side
logger.debug(
(Supplier<?>) () -> new ParameterizedMessage(
"[{}] received a remote error as a response to ping {}", pingingRound.id(), node), e);
} else {
logger.warn(
(Supplier<?>) () -> new ParameterizedMessage(
"[{}] failed send ping to {}", pingingRound.id(), node), e);
}
}
@Override
public void onRejection(Exception e) {
// The RejectedExecutionException can come from the fact unicastZenPingExecutorService is at its max down in sendPings
// But don't bail here, we can retry later on after the send ping has been scheduled.
logger.debug("Ping execution rejected", e);
}
});
}
// for testing
protected void submitToExecutor(AbstractRunnable abstractRunnable) {
unicastZenPingExecutorService.execute(abstractRunnable);
}
// for testing
protected TransportResponseHandler<UnicastPingResponse> getPingResponseHandler(final PingingRound pingingRound,
final DiscoveryNode node) {
return new TransportResponseHandler<UnicastPingResponse>() {
@Override
public UnicastPingResponse newInstance() {
return new UnicastPingResponse();
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public void handleResponse(UnicastPingResponse response) {
logger.trace("[{}] received response from {}: {}", pingingRound.id(), node, Arrays.toString(response.pingResponses));
if (pingingRound.isClosed()) {
if (logger.isTraceEnabled()) {
logger.trace("[{}] skipping received response from {}. already closed", pingingRound.id(), node);
}
} else {
Stream.of(response.pingResponses).forEach(pingingRound::addPingResponseToCollection);
}
}
@Override
public void handleException(TransportException exp) {
if (exp instanceof ConnectTransportException || exp.getCause() instanceof ConnectTransportException) {
// ok, not connected...
logger.trace((Supplier<?>) () -> new ParameterizedMessage("failed to connect to {}", node), exp);
} else if (closed == false) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("failed to send ping to [{}]", node), exp);
}
}
};
}
private UnicastPingResponse handlePingRequest(final UnicastPingRequest request) {
assert clusterName.equals(request.pingResponse.clusterName()) :
"got a ping request from a different cluster. expected " + clusterName + " got " + request.pingResponse.clusterName();
temporalResponses.add(request.pingResponse);
// add to any ongoing pinging
activePingingRounds.values().forEach(p -> p.addPingResponseToCollection(request.pingResponse));
threadPool.schedule(TimeValue.timeValueMillis(request.timeout.millis() * 2), ThreadPool.Names.SAME,
() -> temporalResponses.remove(request.pingResponse));
List<PingResponse> pingResponses = CollectionUtils.iterableAsArrayList(temporalResponses);
pingResponses.add(createPingResponse(contextProvider.clusterState()));
UnicastPingResponse unicastPingResponse = new UnicastPingResponse();
unicastPingResponse.id = request.id;
unicastPingResponse.pingResponses = pingResponses.toArray(new PingResponse[pingResponses.size()]);
return unicastPingResponse;
}
class UnicastPingRequestHandler implements TransportRequestHandler<UnicastPingRequest> {
@Override
public void messageReceived(UnicastPingRequest request, TransportChannel channel) throws Exception {
if (request.pingResponse.clusterName().equals(clusterName)) {
channel.sendResponse(handlePingRequest(request));
} else {
throw new IllegalStateException(
String.format(
Locale.ROOT,
"mismatched cluster names; request: [%s], local: [%s]",
request.pingResponse.clusterName().value(),
clusterName.value()));
}
}
}
public static class UnicastPingRequest extends TransportRequest {
int id;
TimeValue timeout;
PingResponse pingResponse;
public UnicastPingRequest() {
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
id = in.readInt();
timeout = new TimeValue(in);
pingResponse = readPingResponse(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
out.writeInt(id);
timeout.writeTo(out);
pingResponse.writeTo(out);
}
}
private PingResponse createPingResponse(ClusterState clusterState) {
DiscoveryNodes discoNodes = clusterState.nodes();
return new PingResponse(discoNodes.getLocalNode(), discoNodes.getMasterNode(), clusterState);
}
static class UnicastPingResponse extends TransportResponse {
int id;
PingResponse[] pingResponses;
UnicastPingResponse() {
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
id = in.readInt();
pingResponses = new PingResponse[in.readVInt()];
for (int i = 0; i < pingResponses.length; i++) {
pingResponses[i] = readPingResponse(in);
}
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
out.writeInt(id);
out.writeVInt(pingResponses.length);
for (PingResponse pingResponse : pingResponses) {
pingResponse.writeTo(out);
}
}
}
protected Version getVersion() {
return Version.CURRENT; // for tests
}
}