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Elasticsearch - Open Source, Distributed, RESTful Search Engine
/*
* 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.google.common.collect.Maps;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.env.NodeEnvironment;
import org.elasticsearch.index.Index;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
/**
* Handles writing and loading both {@link MetaData} and {@link IndexMetaData}
*/
public class MetaStateService extends AbstractComponent {
static final String FORMAT_SETTING = "gateway.format";
static final String GLOBAL_STATE_FILE_PREFIX = "global-";
private static final String INDEX_STATE_FILE_PREFIX = "state-";
private final NodeEnvironment nodeEnv;
private final XContentType format;
private final ToXContent.Params formatParams;
private final ToXContent.Params gatewayModeFormatParams;
private final MetaDataStateFormat indexStateFormat;
private final MetaDataStateFormat globalStateFormat;
@Inject
public MetaStateService(Settings settings, NodeEnvironment nodeEnv) {
super(settings);
this.nodeEnv = nodeEnv;
this.format = XContentType.fromRestContentType(settings.get(FORMAT_SETTING, "smile"));
if (this.format == XContentType.SMILE) {
Map params = Maps.newHashMap();
params.put("binary", "true");
formatParams = new ToXContent.MapParams(params);
Map gatewayModeParams = Maps.newHashMap();
gatewayModeParams.put("binary", "true");
gatewayModeParams.put(MetaData.CONTEXT_MODE_PARAM, MetaData.CONTEXT_MODE_GATEWAY);
gatewayModeFormatParams = new ToXContent.MapParams(gatewayModeParams);
} else {
formatParams = ToXContent.EMPTY_PARAMS;
Map gatewayModeParams = Maps.newHashMap();
gatewayModeParams.put(MetaData.CONTEXT_MODE_PARAM, MetaData.CONTEXT_MODE_GATEWAY);
gatewayModeFormatParams = new ToXContent.MapParams(gatewayModeParams);
}
indexStateFormat = indexStateFormat(format, formatParams);
globalStateFormat = globalStateFormat(format, gatewayModeFormatParams);
}
/**
* Loads the full state, which includes both the global state and all the indices
* meta state.
*/
MetaData loadFullState() throws Exception {
MetaData globalMetaData = loadGlobalState();
MetaData.Builder metaDataBuilder;
if (globalMetaData != null) {
metaDataBuilder = MetaData.builder(globalMetaData);
} else {
metaDataBuilder = MetaData.builder();
}
final Set indices = nodeEnv.findAllIndices();
for (String index : indices) {
IndexMetaData indexMetaData = loadIndexState(index);
if (indexMetaData == null) {
logger.debug("[{}] failed to find metadata for existing index location", index);
} else {
metaDataBuilder.put(indexMetaData, false);
}
}
return metaDataBuilder.build();
}
/**
* Loads the index state for the provided index name, returning null if doesn't exists.
*/
@Nullable
IndexMetaData loadIndexState(String index) throws IOException {
return indexStateFormat.loadLatestState(logger, nodeEnv.indexPaths(new Index(index)));
}
/**
* Loads the global state, *without* index state, see {@link #loadFullState()} for that.
*/
MetaData loadGlobalState() throws IOException {
MetaData globalState = globalStateFormat.loadLatestState(logger, nodeEnv.nodeDataPaths());
// ES 2.0 now requires units for all time and byte-sized settings, so we add the default unit if it's missing
// TODO: can we somehow only do this for pre-2.0 cluster state?
if (globalState != null) {
return MetaData.addDefaultUnitsIfNeeded(logger, globalState);
} else {
return null;
}
}
/**
* Writes the index state.
*/
void writeIndex(String reason, IndexMetaData indexMetaData, @Nullable IndexMetaData previousIndexMetaData) throws Exception {
logger.trace("[{}] writing state, reason [{}]", indexMetaData.getIndex(), reason);
try {
indexStateFormat.write(indexMetaData, indexMetaData.getVersion(),
nodeEnv.indexPaths(new Index(indexMetaData.getIndex())));
} catch (Throwable ex) {
logger.warn("[{}]: failed to write index state", ex, indexMetaData.getIndex());
throw new IOException("failed to write state for [" + indexMetaData.getIndex() + "]", ex);
}
}
/**
* Writes the global state, *without* the indices states.
*/
void writeGlobalState(String reason, MetaData metaData) throws Exception {
logger.trace("[_global] writing state, reason [{}]", reason);
try {
globalStateFormat.write(metaData, metaData.version(), nodeEnv.nodeDataPaths());
} catch (Throwable ex) {
logger.warn("[_global]: failed to write global state", ex);
throw new IOException("failed to write global state", ex);
}
}
/**
* Returns a StateFormat that can read and write {@link MetaData}
*/
static MetaDataStateFormat globalStateFormat(XContentType format, final ToXContent.Params formatParams) {
return new MetaDataStateFormat(format, GLOBAL_STATE_FILE_PREFIX) {
@Override
public void toXContent(XContentBuilder builder, MetaData state) throws IOException {
MetaData.Builder.toXContent(state, builder, formatParams);
}
@Override
public MetaData fromXContent(XContentParser parser) throws IOException {
return MetaData.Builder.fromXContent(parser);
}
};
}
/**
* Returns a StateFormat that can read and write {@link IndexMetaData}
*/
static MetaDataStateFormat indexStateFormat(XContentType format, final ToXContent.Params formatParams) {
return new MetaDataStateFormat(format, INDEX_STATE_FILE_PREFIX) {
@Override
public void toXContent(XContentBuilder builder, IndexMetaData state) throws IOException {
IndexMetaData.Builder.toXContent(state, builder, formatParams); }
@Override
public IndexMetaData fromXContent(XContentParser parser) throws IOException {
return IndexMetaData.Builder.fromXContent(parser);
}
};
}
}