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/*
* Licensed to ElasticSearch and Shay Banon 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.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ProcessedClusterStateUpdateTask;
import org.elasticsearch.cluster.action.index.NodeAliasesUpdatedAction;
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.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.query.IndexQueryParserService;
import org.elasticsearch.index.service.IndexService;
import org.elasticsearch.indices.IndexMissingException;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.indices.InvalidAliasNameException;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import static org.elasticsearch.cluster.ClusterState.newClusterStateBuilder;
import static org.elasticsearch.cluster.metadata.IndexMetaData.newIndexMetaDataBuilder;
import static org.elasticsearch.cluster.metadata.MetaData.newMetaDataBuilder;
/**
*
*/
public class MetaDataIndexAliasesService extends AbstractComponent {
private final ClusterService clusterService;
private final IndicesService indicesService;
private final NodeAliasesUpdatedAction aliasOperationPerformedAction;
@Inject
public MetaDataIndexAliasesService(Settings settings, ClusterService clusterService, IndicesService indicesService, NodeAliasesUpdatedAction aliasOperationPerformedAction) {
super(settings);
this.clusterService = clusterService;
this.indicesService = indicesService;
this.aliasOperationPerformedAction = aliasOperationPerformedAction;
}
public void indicesAliases(final Request request, final Listener listener) {
clusterService.submitStateUpdateTask("index-aliases", Priority.URGENT, new ProcessedClusterStateUpdateTask() {
@Override
public ClusterState execute(ClusterState currentState) {
for (AliasAction aliasAction : request.actions) {
if (!currentState.metaData().hasIndex(aliasAction.index())) {
listener.onFailure(new IndexMissingException(new Index(aliasAction.index())));
return currentState;
}
if (currentState.metaData().hasIndex(aliasAction.alias())) {
listener.onFailure(new InvalidAliasNameException(new Index(aliasAction.index()), aliasAction.alias(), "an index exists with the same name as the alias"));
return currentState;
}
if (aliasAction.indexRouting() != null && aliasAction.indexRouting().indexOf(',') != -1) {
listener.onFailure(new ElasticSearchIllegalArgumentException("alias [" + aliasAction.alias() + "] has several routing values associated with it"));
return currentState;
}
}
List indicesToClose = Lists.newArrayList();
Map indices = Maps.newHashMap();
try {
boolean changed = false;
MetaData.Builder builder = newMetaDataBuilder().metaData(currentState.metaData());
for (AliasAction aliasAction : request.actions) {
IndexMetaData indexMetaData = builder.get(aliasAction.index());
if (indexMetaData == null) {
throw new IndexMissingException(new Index(aliasAction.index()));
}
IndexMetaData.Builder indexMetaDataBuilder = newIndexMetaDataBuilder(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.index());
if (indexService == null) {
indexService = indicesService.indexService(indexMetaData.index());
if (indexService == null) {
// temporarily create the index so we have can parse the filter
try {
indexService = indicesService.createIndex(indexMetaData.index(), indexMetaData.settings(), currentState.nodes().localNode().id());
} catch (Exception e) {
logger.warn("[{}] failed to temporary create in order to apply alias action", e, indexMetaData.index());
continue;
}
indicesToClose.add(indexMetaData.index());
}
indices.put(indexMetaData.index(), indexService);
}
// now, parse the filter
IndexQueryParserService indexQueryParser = indexService.queryParserService();
try {
XContentParser parser = XContentFactory.xContent(filter).createParser(filter);
try {
indexQueryParser.parseInnerFilter(parser);
} finally {
parser.close();
}
} catch (Throwable e) {
listener.onFailure(new ElasticSearchIllegalArgumentException("failed to parse filter for [" + aliasAction.alias() + "]", e));
return currentState;
}
}
AliasMetaData newAliasMd = AliasMetaData.newAliasMetaDataBuilder(
aliasAction.alias())
.filter(filter)
.indexRouting(aliasAction.indexRouting())
.searchRouting(aliasAction.searchRouting())
.build();
// Check if this alias already exists
AliasMetaData aliasMd = indexMetaData.aliases().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.aliases().containsKey(aliasAction.alias())) {
// This alias doesn't exist - ignore
continue;
}
indexMetaDataBuilder.removerAlias(aliasAction.alias());
}
changed = true;
builder.put(indexMetaDataBuilder);
}
if (changed) {
ClusterState updatedState = newClusterStateBuilder().state(currentState).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().aliases().equals(currentState.metaData().aliases())) {
listener.onResponse(new Response(true));
return currentState;
}
// wait for responses from other nodes if needed
int responseCount = updatedState.nodes().size();
long version = updatedState.version() + 1;
logger.trace("waiting for [{}] notifications with version [{}]", responseCount, version);
aliasOperationPerformedAction.add(new CountDownListener(responseCount, listener, version), request.timeout);
return updatedState;
} else {
// Nothing to do
listener.onResponse(new Response(true));
return currentState;
}
} finally {
for (String index : indicesToClose) {
indicesService.removeIndex(index, "created for alias processing");
}
}
}
@Override
public void clusterStateProcessed(ClusterState clusterState) {
}
});
}
public static interface Listener {
void onResponse(Response response);
void onFailure(Throwable t);
}
public static class Request {
final AliasAction[] actions;
final TimeValue timeout;
public Request(AliasAction[] actions, TimeValue timeout) {
this.actions = actions;
this.timeout = timeout;
}
}
public static class Response {
private final boolean acknowledged;
public Response(boolean acknowledged) {
this.acknowledged = acknowledged;
}
public boolean acknowledged() {
return acknowledged;
}
}
private class CountDownListener implements NodeAliasesUpdatedAction.Listener {
private final AtomicBoolean notified = new AtomicBoolean();
private final AtomicInteger countDown;
private final Listener listener;
private final long version;
public CountDownListener(int countDown, Listener listener, long version) {
this.countDown = new AtomicInteger(countDown);
this.listener = listener;
this.version = version;
}
@Override
public void onAliasesUpdated(NodeAliasesUpdatedAction.NodeAliasesUpdatedResponse response) {
if (version <= response.version()) {
logger.trace("Received NodeAliasesUpdatedResponse with version [{}] from [{}]", response.version(), response.nodeId());
if (countDown.decrementAndGet() == 0) {
aliasOperationPerformedAction.remove(this);
if (notified.compareAndSet(false, true)) {
listener.onResponse(new Response(true));
}
}
}
}
@Override
public void onTimeout() {
aliasOperationPerformedAction.remove(this);
if (notified.compareAndSet(false, true)) {
listener.onResponse(new Response(false));
}
}
}
}
