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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.indices.shrink;
import org.apache.lucene.index.IndexWriter;
import org.elasticsearch.Version;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.indices.create.CreateIndexClusterStateUpdateRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.stats.IndexShardStats;
import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.master.TransportMasterNodeAction;
import org.elasticsearch.client.Client;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.metadata.MetaDataCreateIndexService;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.index.shard.DocsStats;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.util.Locale;
import java.util.Objects;
import java.util.Set;
import java.util.function.IntFunction;
/**
* Main class to initiate resizing (shrink / split) an index into a new index
*/
public class TransportResizeAction extends TransportMasterNodeAction {
private final MetaDataCreateIndexService createIndexService;
private final Client client;
@Inject
public TransportResizeAction(Settings settings, TransportService transportService, ClusterService clusterService,
ThreadPool threadPool, MetaDataCreateIndexService createIndexService,
ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver, Client client) {
this(settings, ResizeAction.NAME, transportService, clusterService, threadPool, createIndexService, actionFilters,
indexNameExpressionResolver, client);
}
protected TransportResizeAction(Settings settings, String actionName, TransportService transportService, ClusterService clusterService,
ThreadPool threadPool, MetaDataCreateIndexService createIndexService,
ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver, Client client) {
super(settings, actionName, transportService, clusterService, threadPool, actionFilters, indexNameExpressionResolver,
ResizeRequest::new);
this.createIndexService = createIndexService;
this.client = client;
}
@Override
protected String executor() {
// we go async right away
return ThreadPool.Names.SAME;
}
@Override
protected ResizeResponse newResponse() {
return new ResizeResponse();
}
@Override
protected ClusterBlockException checkBlock(ResizeRequest request, ClusterState state) {
return state.blocks().indexBlockedException(ClusterBlockLevel.METADATA_WRITE, request.getTargetIndexRequest().index());
}
@Override
protected void masterOperation(final ResizeRequest resizeRequest, final ClusterState state,
final ActionListener listener) {
// there is no need to fetch docs stats for split but we keep it simple and do it anyway for simplicity of the code
final String sourceIndex = indexNameExpressionResolver.resolveDateMathExpression(resizeRequest.getSourceIndex());
final String targetIndex = indexNameExpressionResolver.resolveDateMathExpression(resizeRequest.getTargetIndexRequest().index());
client.admin().indices().prepareStats(sourceIndex).clear().setDocs(true).execute(new ActionListener() {
@Override
public void onResponse(IndicesStatsResponse indicesStatsResponse) {
CreateIndexClusterStateUpdateRequest updateRequest = prepareCreateIndexRequest(resizeRequest, state,
(i) -> {
IndexShardStats shard = indicesStatsResponse.getIndex(sourceIndex).getIndexShards().get(i);
return shard == null ? null : shard.getPrimary().getDocs();
}, sourceIndex, targetIndex);
createIndexService.createIndex(
updateRequest,
ActionListener.wrap(response ->
listener.onResponse(new ResizeResponse(response.isAcknowledged(), response.isShardsAcknowledged(),
updateRequest.index())), listener::onFailure
)
);
}
@Override
public void onFailure(Exception e) {
listener.onFailure(e);
}
});
}
// static for unittesting this method
static CreateIndexClusterStateUpdateRequest prepareCreateIndexRequest(final ResizeRequest resizeRequest, final ClusterState state
, final IntFunction perShardDocStats, String sourceIndexName, String targetIndexName) {
final CreateIndexRequest targetIndex = resizeRequest.getTargetIndexRequest();
final IndexMetaData metaData = state.metaData().index(sourceIndexName);
if (metaData == null) {
throw new IndexNotFoundException(sourceIndexName);
}
final Settings targetIndexSettings = Settings.builder().put(targetIndex.settings())
.normalizePrefix(IndexMetaData.INDEX_SETTING_PREFIX).build();
final int numShards;
if (IndexMetaData.INDEX_NUMBER_OF_SHARDS_SETTING.exists(targetIndexSettings)) {
numShards = IndexMetaData.INDEX_NUMBER_OF_SHARDS_SETTING.get(targetIndexSettings);
} else {
assert resizeRequest.getResizeType() == ResizeType.SHRINK : "split must specify the number of shards explicitly";
numShards = 1;
}
for (int i = 0; i < numShards; i++) {
if (resizeRequest.getResizeType() == ResizeType.SHRINK) {
Set shardIds = IndexMetaData.selectShrinkShards(i, metaData, numShards);
long count = 0;
for (ShardId id : shardIds) {
DocsStats docsStats = perShardDocStats.apply(id.id());
if (docsStats != null) {
count += docsStats.getCount();
}
if (count > IndexWriter.MAX_DOCS) {
throw new IllegalStateException("Can't merge index with more than [" + IndexWriter.MAX_DOCS
+ "] docs - too many documents in shards " + shardIds);
}
}
} else {
Objects.requireNonNull(IndexMetaData.selectSplitShard(i, metaData, numShards));
// we just execute this to ensure we get the right exceptions if the number of shards is wrong or less then etc.
}
}
if (IndexMetaData.INDEX_ROUTING_PARTITION_SIZE_SETTING.exists(targetIndexSettings)) {
throw new IllegalArgumentException("cannot provide a routing partition size value when resizing an index");
}
if (IndexMetaData.INDEX_NUMBER_OF_ROUTING_SHARDS_SETTING.exists(targetIndexSettings)) {
throw new IllegalArgumentException("cannot provide index.number_of_routing_shards on resize");
}
String cause = resizeRequest.getResizeType().name().toLowerCase(Locale.ROOT) + "_index";
targetIndex.cause(cause);
Settings.Builder settingsBuilder = Settings.builder().put(targetIndexSettings);
settingsBuilder.put("index.number_of_shards", numShards);
targetIndex.settings(settingsBuilder);
return new CreateIndexClusterStateUpdateRequest(targetIndex,
cause, targetIndex.index(), targetIndexName, true)
// mappings are updated on the node when creating in the shards, this prevents race-conditions since all mapping must be
// applied once we took the snapshot and if somebody messes things up and switches the index read/write and adds docs we miss
// the mappings for everything is corrupted and hard to debug
.ackTimeout(targetIndex.timeout())
.masterNodeTimeout(targetIndex.masterNodeTimeout())
.settings(targetIndex.settings())
.aliases(targetIndex.aliases())
.customs(targetIndex.customs())
.waitForActiveShards(targetIndex.waitForActiveShards())
.recoverFrom(metaData.getIndex())
.resizeType(resizeRequest.getResizeType());
}
@Override
protected String getMasterActionName(DiscoveryNode node) {
if (node.getVersion().onOrAfter(ResizeAction.COMPATIBILITY_VERSION)){
return super.getMasterActionName(node);
} else {
// this is for BWC - when we send this to version that doesn't have ResizeAction.NAME registered
// we have to send to shrink instead.
return ShrinkAction.NAME;
}
}
}