org.elasticsearch.discovery.zen.MembershipAction Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* 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.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
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.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.EmptyTransportResponseHandler;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportRequest;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportResponse;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
import java.util.Collection;
import java.util.concurrent.TimeUnit;
import java.util.function.BiConsumer;
import java.util.function.Supplier;
public class MembershipAction extends AbstractComponent {
public static final String DISCOVERY_JOIN_ACTION_NAME = "internal:discovery/zen/join";
public static final String DISCOVERY_JOIN_VALIDATE_ACTION_NAME = "internal:discovery/zen/join/validate";
public static final String DISCOVERY_LEAVE_ACTION_NAME = "internal:discovery/zen/leave";
public interface JoinCallback {
void onSuccess();
void onFailure(Exception e);
}
public interface MembershipListener {
void onJoin(DiscoveryNode node, JoinCallback callback);
void onLeave(DiscoveryNode node);
}
private final TransportService transportService;
private final MembershipListener listener;
public MembershipAction(Settings settings, TransportService transportService, MembershipListener listener,
Collection> joinValidators) {
super(settings);
this.transportService = transportService;
this.listener = listener;
transportService.registerRequestHandler(DISCOVERY_JOIN_ACTION_NAME, JoinRequest::new,
ThreadPool.Names.GENERIC, new JoinRequestRequestHandler());
transportService.registerRequestHandler(DISCOVERY_JOIN_VALIDATE_ACTION_NAME,
() -> new ValidateJoinRequest(), ThreadPool.Names.GENERIC,
new ValidateJoinRequestRequestHandler(transportService::getLocalNode, joinValidators));
transportService.registerRequestHandler(DISCOVERY_LEAVE_ACTION_NAME, LeaveRequest::new,
ThreadPool.Names.GENERIC, new LeaveRequestRequestHandler());
}
public void sendLeaveRequest(DiscoveryNode masterNode, DiscoveryNode node) {
transportService.sendRequest(node, DISCOVERY_LEAVE_ACTION_NAME, new LeaveRequest(masterNode),
EmptyTransportResponseHandler.INSTANCE_SAME);
}
public void sendLeaveRequestBlocking(DiscoveryNode masterNode, DiscoveryNode node, TimeValue timeout) {
transportService.submitRequest(masterNode, DISCOVERY_LEAVE_ACTION_NAME, new LeaveRequest(node),
EmptyTransportResponseHandler.INSTANCE_SAME).txGet(timeout.millis(), TimeUnit.MILLISECONDS);
}
public void sendJoinRequestBlocking(DiscoveryNode masterNode, DiscoveryNode node, TimeValue timeout) {
transportService.submitRequest(masterNode, DISCOVERY_JOIN_ACTION_NAME, new JoinRequest(node),
EmptyTransportResponseHandler.INSTANCE_SAME).txGet(timeout.millis(), TimeUnit.MILLISECONDS);
}
/**
* Validates the join request, throwing a failure if it failed.
*/
public void sendValidateJoinRequestBlocking(DiscoveryNode node, ClusterState state, TimeValue timeout) {
transportService.submitRequest(node, DISCOVERY_JOIN_VALIDATE_ACTION_NAME, new ValidateJoinRequest(state),
EmptyTransportResponseHandler.INSTANCE_SAME).txGet(timeout.millis(), TimeUnit.MILLISECONDS);
}
public static class JoinRequest extends TransportRequest {
DiscoveryNode node;
public JoinRequest() {
}
private JoinRequest(DiscoveryNode node) {
this.node = node;
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
node = new DiscoveryNode(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
node.writeTo(out);
}
}
private class JoinRequestRequestHandler implements TransportRequestHandler {
@Override
public void messageReceived(final JoinRequest request, final TransportChannel channel) throws Exception {
listener.onJoin(request.node, new JoinCallback() {
@Override
public void onSuccess() {
try {
channel.sendResponse(TransportResponse.Empty.INSTANCE);
} catch (Exception e) {
onFailure(e);
}
}
@Override
public void onFailure(Exception e) {
try {
channel.sendResponse(e);
} catch (Exception inner) {
inner.addSuppressed(e);
logger.warn("failed to send back failure on join request", inner);
}
}
});
}
}
static class ValidateJoinRequest extends TransportRequest {
private ClusterState state;
ValidateJoinRequest() {}
ValidateJoinRequest(ClusterState state) {
this.state = state;
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
this.state = ClusterState.readFrom(in, null);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
this.state.writeTo(out);
}
}
static class ValidateJoinRequestRequestHandler implements TransportRequestHandler {
private final Supplier localNodeSupplier;
private final Collection> joinValidators;
ValidateJoinRequestRequestHandler(Supplier localNodeSupplier,
Collection> joinValidators) {
this.localNodeSupplier = localNodeSupplier;
this.joinValidators = joinValidators;
}
@Override
public void messageReceived(ValidateJoinRequest request, TransportChannel channel) throws Exception {
DiscoveryNode node = localNodeSupplier.get();
assert node != null : "local node is null";
joinValidators.stream().forEach(action -> action.accept(node, request.state));
channel.sendResponse(TransportResponse.Empty.INSTANCE);
}
}
/**
* Ensures that all indices are compatible with the given node version. This will ensure that all indices in the given metadata
* will not be created with a newer version of elasticsearch as well as that all indices are newer or equal to the minimum index
* compatibility version.
* @see Version#minimumIndexCompatibilityVersion()
* @throws IllegalStateException if any index is incompatible with the given version
*/
static void ensureIndexCompatibility(final Version nodeVersion, MetaData metaData) {
Version supportedIndexVersion = nodeVersion.minimumIndexCompatibilityVersion();
// we ensure that all indices in the cluster we join are compatible with us no matter if they are
// closed or not we can't read mappings of these indices so we need to reject the join...
for (IndexMetaData idxMetaData : metaData) {
if (idxMetaData.getCreationVersion().after(nodeVersion)) {
throw new IllegalStateException("index " + idxMetaData.getIndex() + " version not supported: "
+ idxMetaData.getCreationVersion() + " the node version is: " + nodeVersion);
}
if (idxMetaData.getCreationVersion().before(supportedIndexVersion)) {
throw new IllegalStateException("index " + idxMetaData.getIndex() + " version not supported: "
+ idxMetaData.getCreationVersion() + " minimum compatible index version is: " + supportedIndexVersion);
}
}
}
/** ensures that the joining node has a version that's compatible with all current nodes*/
static void ensureNodesCompatibility(final Version joiningNodeVersion, DiscoveryNodes currentNodes) {
final Version minNodeVersion = currentNodes.getMinNodeVersion();
final Version maxNodeVersion = currentNodes.getMaxNodeVersion();
ensureNodesCompatibility(joiningNodeVersion, minNodeVersion, maxNodeVersion);
}
/** ensures that the joining node has a version that's compatible with a given version range */
static void ensureNodesCompatibility(Version joiningNodeVersion, Version minClusterNodeVersion, Version maxClusterNodeVersion) {
assert minClusterNodeVersion.onOrBefore(maxClusterNodeVersion) : minClusterNodeVersion + " > " + maxClusterNodeVersion;
if (joiningNodeVersion.isCompatible(maxClusterNodeVersion) == false) {
throw new IllegalStateException("node version [" + joiningNodeVersion + "] is not supported. " +
"The cluster contains nodes with version [" + maxClusterNodeVersion + "], which is incompatible.");
}
if (joiningNodeVersion.isCompatible(minClusterNodeVersion) == false) {
throw new IllegalStateException("node version [" + joiningNodeVersion + "] is not supported." +
"The cluster contains nodes with version [" + minClusterNodeVersion + "], which is incompatible.");
}
}
/**
* ensures that the joining node's major version is equal or higher to the minClusterNodeVersion. This is needed
* to ensure that if the master is already fully operating under the new major version, it doesn't go back to mixed
* version mode
**/
static void ensureMajorVersionBarrier(Version joiningNodeVersion, Version minClusterNodeVersion) {
final byte clusterMajor = minClusterNodeVersion.major;
if (joiningNodeVersion.major < clusterMajor) {
throw new IllegalStateException("node version [" + joiningNodeVersion + "] is not supported. " +
"All nodes in the cluster are of a higher major [" + clusterMajor + "].");
}
}
public static class LeaveRequest extends TransportRequest {
private DiscoveryNode node;
public LeaveRequest() {
}
private LeaveRequest(DiscoveryNode node) {
this.node = node;
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
node = new DiscoveryNode(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
node.writeTo(out);
}
}
private class LeaveRequestRequestHandler implements TransportRequestHandler {
@Override
public void messageReceived(LeaveRequest request, TransportChannel channel) throws Exception {
listener.onLeave(request.node);
channel.sendResponse(TransportResponse.Empty.INSTANCE);
}
}
}