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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 org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.EsRejectedExecutionException;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.ConnectTransportException;
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.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.Supplier;
import static org.elasticsearch.common.util.concurrent.ConcurrentCollections.newConcurrentMap;
/**
* A fault detection of multiple nodes.
*/
public class NodesFaultDetection extends FaultDetection {
private static final Logger logger = LogManager.getLogger(NodesFaultDetection.class);
public static final String PING_ACTION_NAME = "internal:discovery/zen/fd/ping";
public abstract static class Listener {
public void onNodeFailure(DiscoveryNode node, String reason) {}
public void onPingReceived(PingRequest pingRequest) {}
}
private final CopyOnWriteArrayList listeners = new CopyOnWriteArrayList<>();
private final ConcurrentMap nodesFD = newConcurrentMap();
private final Supplier clusterStateSupplier;
private volatile DiscoveryNode localNode;
public NodesFaultDetection(Settings settings, ThreadPool threadPool, TransportService transportService,
Supplier clusterStateSupplier, ClusterName clusterName) {
super(settings, threadPool, transportService, clusterName);
this.clusterStateSupplier = clusterStateSupplier;
logger.debug("[node ] uses ping_interval [{}], ping_timeout [{}], ping_retries [{}]", pingInterval, pingRetryTimeout,
pingRetryCount);
transportService.registerRequestHandler(
PING_ACTION_NAME, ThreadPool.Names.SAME, false, false, PingRequest::new, new PingRequestHandler());
}
public void setLocalNode(DiscoveryNode localNode) {
this.localNode = localNode;
}
public void addListener(Listener listener) {
listeners.add(listener);
}
public void removeListener(Listener listener) {
listeners.remove(listener);
}
/**
* Gets the current set of nodes involved in node fault detection.
* NB: For testing purposes.
*/
public Set getNodes() {
return Collections.unmodifiableSet(nodesFD.keySet());
}
/**
* make sure that nodes in clusterState are pinged. Any pinging to nodes which are not
* part of the cluster will be stopped
*/
public void updateNodesAndPing(ClusterState clusterState) {
// remove any nodes we don't need, this will cause their FD to stop
for (DiscoveryNode monitoredNode : nodesFD.keySet()) {
if (!clusterState.nodes().nodeExists(monitoredNode)) {
nodesFD.remove(monitoredNode);
}
}
// add any missing nodes
for (DiscoveryNode node : clusterState.nodes()) {
if (node.equals(localNode)) {
// no need to monitor the local node
continue;
}
if (!nodesFD.containsKey(node)) {
NodeFD fd = new NodeFD(node);
// it's OK to overwrite an existing nodeFD - it will just stop and the new one will pick things up.
nodesFD.put(node, fd);
// we use schedule with a 0 time value to run the pinger on the pool as it will run on later
threadPool.schedule(fd, TimeValue.timeValueMillis(0), ThreadPool.Names.SAME);
}
}
}
/** stops all pinging **/
public NodesFaultDetection stop() {
nodesFD.clear();
return this;
}
@Override
public void close() {
super.close();
stop();
}
@Override
protected void handleTransportDisconnect(DiscoveryNode node) {
NodeFD nodeFD = nodesFD.remove(node);
if (nodeFD == null) {
return;
}
if (connectOnNetworkDisconnect) {
NodeFD fd = new NodeFD(node);
try {
transportService.connectToNode(node);
nodesFD.put(node, fd);
// we use schedule with a 0 time value to run the pinger on the pool as it will run on later
threadPool.schedule(fd, TimeValue.timeValueMillis(0), ThreadPool.Names.SAME);
} catch (Exception e) {
logger.trace("[node ] [{}] transport disconnected (with verified connect)", node);
// clean up if needed, just to be safe..
nodesFD.remove(node, fd);
notifyNodeFailure(node, "transport disconnected (with verified connect)");
}
} else {
logger.trace("[node ] [{}] transport disconnected", node);
notifyNodeFailure(node, "transport disconnected");
}
}
private void notifyNodeFailure(final DiscoveryNode node, final String reason) {
try {
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
for (Listener listener : listeners) {
listener.onNodeFailure(node, reason);
}
}
});
} catch (EsRejectedExecutionException ex) {
logger.trace(() -> new ParameterizedMessage(
"[node ] [{}] ignoring node failure (reason [{}]). Local node is shutting down", node, reason), ex);
}
}
private void notifyPingReceived(final PingRequest pingRequest) {
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
for (Listener listener : listeners) {
listener.onPingReceived(pingRequest);
}
}
});
}
private class NodeFD implements Runnable {
volatile int retryCount;
private final DiscoveryNode node;
private NodeFD(DiscoveryNode node) {
this.node = node;
}
private boolean running() {
return NodeFD.this.equals(nodesFD.get(node));
}
private PingRequest newPingRequest() {
return new PingRequest(node, clusterName, localNode, clusterStateSupplier.get().version());
}
@Override
public void run() {
if (!running()) {
return;
}
final TransportRequestOptions options = TransportRequestOptions.builder().withType(TransportRequestOptions.Type.PING)
.withTimeout(pingRetryTimeout).build();
transportService.sendRequest(node, PING_ACTION_NAME, newPingRequest(), options, new TransportResponseHandler() {
@Override
public PingResponse read(StreamInput in) throws IOException {
return new PingResponse(in);
}
@Override
public void handleResponse(PingResponse response) {
if (!running()) {
return;
}
retryCount = 0;
threadPool.schedule(NodeFD.this, pingInterval, ThreadPool.Names.SAME);
}
@Override
public void handleException(TransportException exp) {
if (!running()) {
return;
}
if (exp instanceof ConnectTransportException || exp.getCause() instanceof ConnectTransportException) {
handleTransportDisconnect(node);
return;
}
retryCount++;
logger.trace( () -> new ParameterizedMessage(
"[node ] failed to ping [{}], retry [{}] out of [{}]", node, retryCount, pingRetryCount), exp);
if (retryCount >= pingRetryCount) {
logger.debug("[node ] failed to ping [{}], tried [{}] times, each with maximum [{}] timeout", node,
pingRetryCount, pingRetryTimeout);
// not good, failure
if (nodesFD.remove(node, NodeFD.this)) {
notifyNodeFailure(node, "failed to ping, tried [" + pingRetryCount + "] times, each with maximum ["
+ pingRetryTimeout + "] timeout");
}
} else {
// resend the request, not reschedule, rely on send timeout
transportService.sendRequest(node, PING_ACTION_NAME, newPingRequest(), options, this);
}
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
}
);
}
}
class PingRequestHandler implements TransportRequestHandler {
@Override
public void messageReceived(PingRequest request, TransportChannel channel, Task task) throws Exception {
// if we are not the node we are supposed to be pinged, send an exception
// this can happen when a kill -9 is sent, and another node is started using the same port
if (!localNode.equals(request.targetNode())) {
throw new IllegalStateException("Got pinged as node " + request.targetNode() + "], but I am node " + localNode );
}
// PingRequest will have clusterName set to null if it came from a node of version <1.4.0
if (request.clusterName != null && !request.clusterName.equals(clusterName)) {
// Don't introduce new exception for bwc reasons
throw new IllegalStateException("Got pinged with cluster name [" + request.clusterName + "], but I'm part of cluster ["
+ clusterName + "]");
}
notifyPingReceived(request);
channel.sendResponse(new PingResponse());
}
}
public static class PingRequest extends TransportRequest {
// the (assumed) node we are pinging
private DiscoveryNode targetNode;
private ClusterName clusterName;
private DiscoveryNode masterNode;
private long clusterStateVersion = ClusterState.UNKNOWN_VERSION;
public PingRequest(StreamInput in) throws IOException {
super(in);
targetNode = new DiscoveryNode(in);
clusterName = new ClusterName(in);
masterNode = new DiscoveryNode(in);
clusterStateVersion = in.readLong();
}
public PingRequest(DiscoveryNode targetNode, ClusterName clusterName, DiscoveryNode masterNode, long clusterStateVersion) {
this.targetNode = targetNode;
this.clusterName = clusterName;
this.masterNode = masterNode;
this.clusterStateVersion = clusterStateVersion;
}
public DiscoveryNode targetNode() {
return targetNode;
}
public ClusterName clusterName() {
return clusterName;
}
public DiscoveryNode masterNode() {
return masterNode;
}
public long clusterStateVersion() {
return clusterStateVersion;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
targetNode.writeTo(out);
clusterName.writeTo(out);
masterNode.writeTo(out);
out.writeLong(clusterStateVersion);
}
}
public static class PingResponse extends TransportResponse {
public PingResponse() {
}
public PingResponse(StreamInput in) throws IOException {
super(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {}
}
}