/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.cluster.metadata;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateListener;
import org.elasticsearch.cluster.ProcessedClusterStateUpdateTask;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
import org.elasticsearch.cluster.routing.allocation.ShardsAllocation;
import org.elasticsearch.common.Booleans;
import org.elasticsearch.common.collect.Sets;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import java.util.Map;
import java.util.Set;
import static org.elasticsearch.cluster.ClusterState.*;
/**
* @author kimchy (shay.banon)
*/
public class MetaDataUpdateSettingsService extends AbstractComponent implements ClusterStateListener {
private final ClusterService clusterService;
private final ShardsAllocation shardsAllocation;
@Inject public MetaDataUpdateSettingsService(Settings settings, ClusterService clusterService, ShardsAllocation shardsAllocation) {
super(settings);
this.clusterService = clusterService;
this.clusterService.add(this);
this.shardsAllocation = shardsAllocation;
}
@Override public void clusterChanged(ClusterChangedEvent event) {
// update an index with number of replicas based on data nodes if possible
if (!event.state().nodes().localNodeMaster()) {
return;
}
// we need to do this each time in case it was changed by update settings
for (final IndexMetaData indexMetaData : event.state().metaData()) {
String autoExpandReplicas = indexMetaData.settings().get(IndexMetaData.SETTING_AUTO_EXPAND_REPLICAS);
if (autoExpandReplicas != null && Booleans.parseBoolean(autoExpandReplicas, true)) { // Booleans only work for false values, just as we want it here
try {
int min;
int max;
try {
min = Integer.parseInt(autoExpandReplicas.substring(0, autoExpandReplicas.indexOf('-')));
String sMax = autoExpandReplicas.substring(autoExpandReplicas.indexOf('-') + 1);
if (sMax.equals("all")) {
max = event.state().nodes().dataNodes().size() - 1;
} else {
max = Integer.parseInt(sMax);
}
} catch (Exception e) {
logger.warn("failed to set [{}], wrong format [{}]", e, IndexMetaData.SETTING_AUTO_EXPAND_REPLICAS, autoExpandReplicas);
continue;
}
int numberOfReplicas = event.state().nodes().dataNodes().size() - 1;
if (numberOfReplicas < min) {
numberOfReplicas = min;
} else if (numberOfReplicas > max) {
numberOfReplicas = max;
}
// same value, nothing to do there
if (numberOfReplicas == indexMetaData.numberOfReplicas()) {
continue;
}
if (numberOfReplicas >= min && numberOfReplicas <= max) {
final int fNumberOfReplicas = numberOfReplicas;
Settings settings = ImmutableSettings.settingsBuilder().put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, fNumberOfReplicas).build();
updateSettings(settings, new String[]{indexMetaData.index()}, new Listener() {
@Override public void onSuccess() {
logger.info("[{}] auto expanded replicas to [{}]", indexMetaData.index(), fNumberOfReplicas);
}
@Override public void onFailure(Throwable t) {
logger.warn("[{}] fail to auto expand replicas to [{}]", indexMetaData.index(), fNumberOfReplicas);
}
});
}
} catch (Exception e) {
logger.warn("[{}] failed to parse auto expand replicas", e, indexMetaData.index());
}
}
}
}
public void updateSettings(final Settings pSettings, final String[] indices, final Listener listener) {
ImmutableSettings.Builder updatedSettingsBuilder = ImmutableSettings.settingsBuilder();
for (Map.Entry<String, String> entry : pSettings.getAsMap().entrySet()) {
if (entry.getKey().equals("index")) {
continue;
}
if (!entry.getKey().startsWith("index.")) {
updatedSettingsBuilder.put("index." + entry.getKey(), entry.getValue());
} else {
updatedSettingsBuilder.put(entry.getKey(), entry.getValue());
}
}
// never allow to change the number of shards
for (String key : updatedSettingsBuilder.internalMap().keySet()) {
if (key.equals(IndexMetaData.SETTING_NUMBER_OF_SHARDS)) {
listener.onFailure(new ElasticSearchIllegalArgumentException("can't change the number of shards for an index"));
return;
}
}
final Settings closeSettings = updatedSettingsBuilder.build();
final Set<String> removedSettings = Sets.newHashSet();
for (String key : updatedSettingsBuilder.internalMap().keySet()) {
if (!IndexMetaData.dynamicSettings().contains(key)) {
removedSettings.add(key);
}
}
if (!removedSettings.isEmpty()) {
for (String removedSetting : removedSettings) {
updatedSettingsBuilder.remove(removedSetting);
}
}
final Settings openSettings = updatedSettingsBuilder.build();
clusterService.submitStateUpdateTask("update-settings", new ProcessedClusterStateUpdateTask() {
@Override public ClusterState execute(ClusterState currentState) {
try {
String[] actualIndices = currentState.metaData().concreteIndices(indices);
RoutingTable.Builder routingTableBuilder = RoutingTable.builder().routingTable(currentState.routingTable());
MetaData.Builder metaDataBuilder = MetaData.newMetaDataBuilder().metaData(currentState.metaData());
int updatedNumberOfReplicas = openSettings.getAsInt(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, -1);
if (updatedNumberOfReplicas != -1) {
routingTableBuilder.updateNumberOfReplicas(updatedNumberOfReplicas, actualIndices);
metaDataBuilder.updateNumberOfReplicas(updatedNumberOfReplicas, actualIndices);
logger.info("updating number_of_replicas to [{}] for indices {}", updatedNumberOfReplicas, actualIndices);
}
// allow to change any settings to a close index, and only allow dynamic settings to be changed
// on an open index
Set<String> openIndices = Sets.newHashSet();
Set<String> closeIndices = Sets.newHashSet();
for (String index : actualIndices) {
if (currentState.metaData().index(index).state() == IndexMetaData.State.OPEN) {
openIndices.add(index);
} else {
closeIndices.add(index);
}
}
if (!openIndices.isEmpty()) {
String[] indices = openIndices.toArray(new String[openIndices.size()]);
if (!removedSettings.isEmpty()) {
logger.warn("{} ignoring non dynamic index level settings for open indices: {}", indices, removedSettings);
}
metaDataBuilder.updateSettings(openSettings, indices);
}
if (!closeIndices.isEmpty()) {
String[] indices = closeIndices.toArray(new String[closeIndices.size()]);
metaDataBuilder.updateSettings(closeSettings, indices);
}
ClusterState updatedState = ClusterState.builder().state(currentState).metaData(metaDataBuilder).routingTable(routingTableBuilder).build();
// now, reroute in case things change that require it (like number of replicas)
RoutingAllocation.Result routingResult = shardsAllocation.reroute(updatedState);
updatedState = newClusterStateBuilder().state(updatedState).routingResult(routingResult).build();
return updatedState;
} catch (Exception e) {
listener.onFailure(e);
return currentState;
}
}
@Override public void clusterStateProcessed(ClusterState clusterState) {
listener.onSuccess();
}
});
}
public static interface Listener {
void onSuccess();
void onFailure(Throwable t);
}
}