org.elasticsearch.gateway.DanglingIndicesState Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :core
/*
* 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.gateway;
import com.carrotsearch.hppc.cursors.ObjectCursor;
import org.elasticsearch.cluster.metadata.IndexGraveyard;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.env.NodeEnvironment;
import org.elasticsearch.index.Index;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import static java.util.Collections.emptyMap;
import static java.util.Collections.unmodifiableMap;
/**
* The dangling indices state is responsible for finding new dangling indices (indices that have
* their state written on disk, but don't exists in the metadata of the cluster), and importing
* them into the cluster.
*/
public class DanglingIndicesState extends AbstractComponent {
private final NodeEnvironment nodeEnv;
private final MetaStateService metaStateService;
private final LocalAllocateDangledIndices allocateDangledIndices;
private final Map danglingIndices = ConcurrentCollections.newConcurrentMap();
@Inject
public DanglingIndicesState(Settings settings, NodeEnvironment nodeEnv, MetaStateService metaStateService,
LocalAllocateDangledIndices allocateDangledIndices) {
super(settings);
this.nodeEnv = nodeEnv;
this.metaStateService = metaStateService;
this.allocateDangledIndices = allocateDangledIndices;
}
/**
* Process dangling indices based on the provided meta data, handling cleanup, finding
* new dangling indices, and allocating outstanding ones.
*/
public void processDanglingIndices(final MetaData metaData) {
if (nodeEnv.hasNodeFile() == false) {
return;
}
cleanupAllocatedDangledIndices(metaData);
findNewAndAddDanglingIndices(metaData);
allocateDanglingIndices();
}
/**
* The current set of dangling indices.
*/
Map getDanglingIndices() {
// This might be a good use case for CopyOnWriteHashMap
return unmodifiableMap(new HashMap<>(danglingIndices));
}
/**
* Cleans dangling indices if they are already allocated on the provided meta data.
*/
void cleanupAllocatedDangledIndices(MetaData metaData) {
for (Index index : danglingIndices.keySet()) {
final IndexMetaData indexMetaData = metaData.index(index);
if (indexMetaData != null && indexMetaData.getIndex().getName().equals(index.getName())) {
if (indexMetaData.getIndex().getUUID().equals(index.getUUID()) == false) {
logger.warn("[{}] can not be imported as a dangling index, as there is already another index " +
"with the same name but a different uuid. local index will be ignored (but not deleted)", index);
} else {
logger.debug("[{}] no longer dangling (created), removing from dangling list", index);
}
danglingIndices.remove(index);
}
}
}
/**
* Finds (@{link #findNewAndAddDanglingIndices}) and adds the new dangling indices
* to the currently tracked dangling indices.
*/
void findNewAndAddDanglingIndices(final MetaData metaData) {
danglingIndices.putAll(findNewDanglingIndices(metaData));
}
/**
* Finds new dangling indices by iterating over the indices and trying to find indices
* that have state on disk, but are not part of the provided meta data, or not detected
* as dangled already.
*/
Map findNewDanglingIndices(final MetaData metaData) {
final Set excludeIndexPathIds = new HashSet<>(metaData.indices().size() + danglingIndices.size());
for (ObjectCursor cursor : metaData.indices().values()) {
excludeIndexPathIds.add(cursor.value.getIndex().getUUID());
}
excludeIndexPathIds.addAll(danglingIndices.keySet().stream().map(Index::getUUID).collect(Collectors.toList()));
try {
final List indexMetaDataList = metaStateService.loadIndicesStates(excludeIndexPathIds::contains);
Map newIndices = new HashMap<>(indexMetaDataList.size());
final IndexGraveyard graveyard = metaData.indexGraveyard();
for (IndexMetaData indexMetaData : indexMetaDataList) {
if (metaData.hasIndex(indexMetaData.getIndex().getName())) {
logger.warn("[{}] can not be imported as a dangling index, as index with same name already exists in cluster metadata",
indexMetaData.getIndex());
} else if (graveyard.containsIndex(indexMetaData.getIndex())) {
logger.warn("[{}] can not be imported as a dangling index, as an index with the same name and UUID exist in the " +
"index tombstones. This situation is likely caused by copying over the data directory for an index " +
"that was previously deleted.", indexMetaData.getIndex());
} else {
logger.info("[{}] dangling index exists on local file system, but not in cluster metadata, " +
"auto import to cluster state", indexMetaData.getIndex());
newIndices.put(indexMetaData.getIndex(), indexMetaData);
}
}
return newIndices;
} catch (IOException e) {
logger.warn("failed to list dangling indices", e);
return emptyMap();
}
}
/**
* Allocates the provided list of the dangled indices by sending them to the master node
* for allocation.
*/
private void allocateDanglingIndices() {
if (danglingIndices.isEmpty()) {
return;
}
try {
allocateDangledIndices.allocateDangled(Collections.unmodifiableCollection(new ArrayList<>(danglingIndices.values())),
new LocalAllocateDangledIndices.Listener() {
@Override
public void onResponse(LocalAllocateDangledIndices.AllocateDangledResponse response) {
logger.trace("allocated dangled");
}
@Override
public void onFailure(Throwable e) {
logger.info("failed to send allocated dangled", e);
}
}
);
} catch (Exception e) {
logger.warn("failed to send allocate dangled", e);
}
}
}