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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.cluster.metadata;
import com.carrotsearch.hppc.cursors.ObjectCursor;
import com.google.common.collect.Maps;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.indices.alias.IndicesAliasesClusterStateUpdateRequest;
import org.elasticsearch.cluster.AckedClusterStateUpdateTask;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ack.ClusterStateUpdateResponse;
import org.elasticsearch.common.Priority;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.indices.IndicesService;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Service responsible for submitting add and remove aliases requests
*/
public class MetaDataIndexAliasesService extends AbstractComponent {
private final ClusterService clusterService;
private final IndicesService indicesService;
private final AliasValidator aliasValidator;
@Inject
public MetaDataIndexAliasesService(Settings settings, ClusterService clusterService, IndicesService indicesService, AliasValidator aliasValidator) {
super(settings);
this.clusterService = clusterService;
this.indicesService = indicesService;
this.aliasValidator = aliasValidator;
}
public void indicesAliases(final IndicesAliasesClusterStateUpdateRequest request, final ActionListener<ClusterStateUpdateResponse> listener) {
clusterService.submitStateUpdateTask("index-aliases", new AckedClusterStateUpdateTask<ClusterStateUpdateResponse>(Priority.URGENT, request, listener) {
@Override
protected ClusterStateUpdateResponse newResponse(boolean acknowledged) {
return new ClusterStateUpdateResponse(acknowledged);
}
@Override
public boolean doPresistMetaData() {
return true;
}
@Override
public ClusterState execute(final ClusterState currentState) {
List<String> indicesToClose = new ArrayList<>();
Map<String, IndexService> indices = Maps.newHashMap();
try {
for (AliasAction aliasAction : request.actions()) {
aliasValidator.validateAliasAction(aliasAction, currentState.metaData());
if (!currentState.metaData().hasIndex(aliasAction.index())) {
throw new IndexNotFoundException(aliasAction.index());
}
}
boolean changed = false;
MetaData.Builder builder = MetaData.builder(currentState.metaData());
for (AliasAction aliasAction : request.actions()) {
IndexMetaData indexMetaData = builder.get(aliasAction.index());
if (indexMetaData == null) {
throw new IndexNotFoundException(aliasAction.index());
}
// TODO: not copy (putAll)
IndexMetaData.Builder indexMetaDataBuilder = IndexMetaData.builder(indexMetaData);
if (aliasAction.actionType() == AliasAction.Type.ADD) {
String filter = aliasAction.filter();
if (Strings.hasLength(filter)) {
// parse the filter, in order to validate it
IndexService indexService = indices.get(indexMetaData.getIndex());
if (indexService == null) {
indexService = indicesService.indexService(indexMetaData.getIndex());
if (indexService == null) {
// temporarily create the index and add mappings so we can parse the filter
try {
indexService = indicesService.createIndex(indexMetaData.getIndex(), indexMetaData.getSettings(), clusterService.localNode().id());
for (ObjectCursor<MappingMetaData> cursor : indexMetaData.getMappings().values()) {
MappingMetaData mappingMetaData = cursor.value;
indexService.mapperService().merge(mappingMetaData.type(), mappingMetaData.source(), MapperService.MergeReason.MAPPING_RECOVERY, false);
}
} catch (Exception e) {
logger.warn("[{}] failed to temporary create in order to apply alias action", e, indexMetaData.getIndex());
continue;
}
indicesToClose.add(indexMetaData.getIndex());
}
indices.put(indexMetaData.getIndex(), indexService);
}
aliasValidator.validateAliasFilter(aliasAction.alias(), filter, indexService.queryParserService());
}
AliasMetaData newAliasMd = AliasMetaData.newAliasMetaDataBuilder(
aliasAction.alias())
.filter(filter)
.indexRouting(aliasAction.indexRouting())
.searchRouting(aliasAction.searchRouting())
.build();
// Check if this alias already exists
AliasMetaData aliasMd = indexMetaData.getAliases().get(aliasAction.alias());
if (aliasMd != null && aliasMd.equals(newAliasMd)) {
// It's the same alias - ignore it
continue;
}
indexMetaDataBuilder.putAlias(newAliasMd);
} else if (aliasAction.actionType() == AliasAction.Type.REMOVE) {
if (!indexMetaData.getAliases().containsKey(aliasAction.alias())) {
// This alias doesn't exist - ignore
continue;
}
indexMetaDataBuilder.removeAlias(aliasAction.alias());
}
changed = true;
builder.put(indexMetaDataBuilder);
}
if (changed) {
ClusterState updatedState = ClusterState.builder(currentState).incrementVersion().metaData(builder).build();
// even though changes happened, they resulted in 0 actual changes to metadata
// i.e. remove and add the same alias to the same index
if (!updatedState.metaData().equalsAliases(currentState.metaData())) {
return updatedState;
}
}
return currentState;
} finally {
for (String index : indicesToClose) {
indicesService.removeIndex(index, "created for alias processing");
}
}
}
});
}
}