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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.action.admin.cluster.settings;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.master.TransportMasterNodeAction;
import org.elasticsearch.cluster.AckedClusterStateUpdateTask;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.Priority;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.settings.ClusterSettings;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
public class TransportClusterUpdateSettingsAction extends
TransportMasterNodeAction {
private static final Logger logger = LogManager.getLogger(TransportClusterUpdateSettingsAction.class);
private final AllocationService allocationService;
private final ClusterSettings clusterSettings;
@Inject
public TransportClusterUpdateSettingsAction(TransportService transportService, ClusterService clusterService,
ThreadPool threadPool, AllocationService allocationService, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver, ClusterSettings clusterSettings) {
super(ClusterUpdateSettingsAction.NAME, false, transportService, clusterService, threadPool, actionFilters,
ClusterUpdateSettingsRequest::new, indexNameExpressionResolver);
this.allocationService = allocationService;
this.clusterSettings = clusterSettings;
}
@Override
protected String executor() {
return ThreadPool.Names.SAME;
}
@Override
protected ClusterBlockException checkBlock(ClusterUpdateSettingsRequest request, ClusterState state) {
// allow for dedicated changes to the metadata blocks, so we don't block those to allow to "re-enable" it
if (request.transientSettings().size() + request.persistentSettings().size() == 1) {
// only one setting
if (MetaData.SETTING_READ_ONLY_SETTING.exists(request.persistentSettings())
|| MetaData.SETTING_READ_ONLY_SETTING.exists(request.transientSettings())
|| MetaData.SETTING_READ_ONLY_ALLOW_DELETE_SETTING.exists(request.transientSettings())
|| MetaData.SETTING_READ_ONLY_ALLOW_DELETE_SETTING.exists(request.persistentSettings())) {
// one of the settings above as the only setting in the request means - resetting the block!
return null;
}
}
return state.blocks().globalBlockedException(ClusterBlockLevel.METADATA_WRITE);
}
@Override
protected ClusterUpdateSettingsResponse read(StreamInput in) throws IOException {
return new ClusterUpdateSettingsResponse(in);
}
@Override
protected void masterOperation(final ClusterUpdateSettingsRequest request, final ClusterState state,
final ActionListener listener) {
final SettingsUpdater updater = new SettingsUpdater(clusterSettings);
clusterService.submitStateUpdateTask("cluster_update_settings",
new AckedClusterStateUpdateTask(Priority.IMMEDIATE, request, listener) {
private volatile boolean changed = false;
@Override
protected ClusterUpdateSettingsResponse newResponse(boolean acknowledged) {
return new ClusterUpdateSettingsResponse(acknowledged, updater.getTransientUpdates(), updater.getPersistentUpdate());
}
@Override
public void onAllNodesAcked(@Nullable Exception e) {
if (changed) {
reroute(true);
} else {
super.onAllNodesAcked(e);
}
}
@Override
public void onAckTimeout() {
if (changed) {
reroute(false);
} else {
super.onAckTimeout();
}
}
private void reroute(final boolean updateSettingsAcked) {
// We're about to send a second update task, so we need to check if we're still the elected master
// For example the minimum_master_node could have been breached and we're no longer elected master,
// so we should *not* execute the reroute.
if (!clusterService.state().nodes().isLocalNodeElectedMaster()) {
logger.debug("Skipping reroute after cluster update settings, because node is no longer master");
listener.onResponse(new ClusterUpdateSettingsResponse(updateSettingsAcked, updater.getTransientUpdates(),
updater.getPersistentUpdate()));
return;
}
// The reason the reroute needs to be send as separate update task, is that all the *cluster* settings are encapsulate
// in the components (e.g. FilterAllocationDecider), so the changes made by the first call aren't visible
// to the components until the ClusterStateListener instances have been invoked, but are visible after
// the first update task has been completed.
clusterService.submitStateUpdateTask("reroute_after_cluster_update_settings",
new AckedClusterStateUpdateTask(Priority.URGENT, request, listener) {
@Override
public boolean mustAck(DiscoveryNode discoveryNode) {
//we wait for the reroute ack only if the update settings was acknowledged
return updateSettingsAcked;
}
@Override
// we return when the cluster reroute is acked or it times out but the acknowledged flag depends on whether the
// update settings was acknowledged
protected ClusterUpdateSettingsResponse newResponse(boolean acknowledged) {
return new ClusterUpdateSettingsResponse(updateSettingsAcked && acknowledged, updater.getTransientUpdates(),
updater.getPersistentUpdate());
}
@Override
public void onNoLongerMaster(String source) {
logger.debug("failed to preform reroute after cluster settings were updated - current node is no longer a master");
listener.onResponse(new ClusterUpdateSettingsResponse(updateSettingsAcked, updater.getTransientUpdates(),
updater.getPersistentUpdate()));
}
@Override
public void onFailure(String source, Exception e) {
//if the reroute fails we only log
logger.debug(() -> new ParameterizedMessage("failed to perform [{}]", source), e);
listener.onFailure(new ElasticsearchException("reroute after update settings failed", e));
}
@Override
public ClusterState execute(final ClusterState currentState) {
// now, reroute in case things that require it changed (e.g. number of replicas)
return allocationService.reroute(currentState, "reroute after cluster update settings");
}
});
}
@Override
public void onFailure(String source, Exception e) {
logger.debug(() -> new ParameterizedMessage("failed to perform [{}]", source), e);
super.onFailure(source, e);
}
@Override
public ClusterState execute(final ClusterState currentState) {
final ClusterState clusterState =
updater.updateSettings(
currentState,
clusterSettings.upgradeSettings(request.transientSettings()),
clusterSettings.upgradeSettings(request.persistentSettings()),
logger);
changed = clusterState != currentState;
return clusterState;
}
});
}
}