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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.gateway;
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 java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
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<String, IndexMetaData> 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(MetaData metaData) {
if (nodeEnv.hasNodeFile() == false) {
return;
}
cleanupAllocatedDangledIndices(metaData);
findNewAndAddDanglingIndices(metaData);
allocateDanglingIndices();
}
/**
* The current set of dangling indices.
*/
Map<String, IndexMetaData> 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 (String danglingIndex : danglingIndices.keySet()) {
if (metaData.hasIndex(danglingIndex)) {
logger.debug("[{}] no longer dangling (created), removing from dangling list", danglingIndex);
danglingIndices.remove(danglingIndex);
}
}
}
/**
* Finds (@{link #findNewAndAddDanglingIndices}) and adds the new dangling indices
* to the currently tracked dangling indices.
*/
void findNewAndAddDanglingIndices(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<String, IndexMetaData> findNewDanglingIndices(MetaData metaData) {
final Set<String> indices;
try {
indices = nodeEnv.findAllIndices();
} catch (Throwable e) {
logger.warn("failed to list dangling indices", e);
return emptyMap();
}
Map<String, IndexMetaData> newIndices = new HashMap<>();
for (String indexName : indices) {
if (metaData.hasIndex(indexName) == false && danglingIndices.containsKey(indexName) == false) {
try {
IndexMetaData indexMetaData = metaStateService.loadIndexState(indexName);
if (indexMetaData != null) {
logger.info("[{}] dangling index, exists on local file system, but not in cluster metadata, auto import to cluster state", indexName);
if (!indexMetaData.getIndex().getName().equals(indexName)) {
logger.info("dangled index directory name is [{}], state name is [{}], renaming to directory name", indexName, indexMetaData.getIndex());
indexMetaData = IndexMetaData.builder(indexMetaData).index(indexName).build();
}
newIndices.put(indexName, indexMetaData);
} else {
logger.debug("[{}] dangling index directory detected, but no state found", indexName);
}
} catch (Throwable t) {
logger.warn("[{}] failed to load index state for detected dangled index", t, indexName);
}
}
}
return newIndices;
}
/**
* Allocates the provided list of the dangled indices by sending them to the master node
* for allocation.
*/
private void allocateDanglingIndices() {
if (danglingIndices.isEmpty() == true) {
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 (Throwable e) {
logger.warn("failed to send allocate dangled", e);
}
}
}
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