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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 com.carrotsearch.hppc.ObjectFloatHashMap;
import com.carrotsearch.hppc.ObjectHashSet;
import com.carrotsearch.hppc.cursors.ObjectCursor;
import org.apache.lucene.util.IOUtils;
import org.elasticsearch.action.FailedNodeException;
import org.elasticsearch.cluster.*;
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.env.NodeEnvironment;
import java.nio.file.Path;
/**
*
*/
public class Gateway extends AbstractComponent implements ClusterStateListener {
private final ClusterService clusterService;
private final NodeEnvironment nodeEnv;
private final GatewayMetaState metaState;
private final TransportNodesListGatewayMetaState listGatewayMetaState;
private final String initialMeta;
private final ClusterName clusterName;
@Inject
public Gateway(Settings settings, ClusterService clusterService, NodeEnvironment nodeEnv, GatewayMetaState metaState,
TransportNodesListGatewayMetaState listGatewayMetaState, ClusterName clusterName) {
super(settings);
this.clusterService = clusterService;
this.nodeEnv = nodeEnv;
this.metaState = metaState;
this.listGatewayMetaState = listGatewayMetaState;
this.clusterName = clusterName;
clusterService.addLast(this);
// we define what is our minimum "master" nodes, use that to allow for recovery
this.initialMeta = settings.get("gateway.initial_meta", settings.get("gateway.local.initial_meta", settings.get("discovery.zen.minimum_master_nodes", "1")));
}
public void performStateRecovery(final GatewayStateRecoveredListener listener) throws GatewayException {
ObjectHashSet nodesIds = new ObjectHashSet<>(clusterService.state().nodes().masterNodes().keys());
logger.trace("performing state recovery from {}", nodesIds);
TransportNodesListGatewayMetaState.NodesGatewayMetaState nodesState = listGatewayMetaState.list(nodesIds.toArray(String.class), null).actionGet();
int requiredAllocation = calcRequiredAllocations(this.initialMeta, nodesIds.size());
if (nodesState.failures().length > 0) {
for (FailedNodeException failedNodeException : nodesState.failures()) {
logger.warn("failed to fetch state from node", failedNodeException);
}
}
ObjectFloatHashMap indices = new ObjectFloatHashMap<>();
MetaData electedGlobalState = null;
int found = 0;
for (TransportNodesListGatewayMetaState.NodeGatewayMetaState nodeState : nodesState) {
if (nodeState.metaData() == null) {
continue;
}
found++;
if (electedGlobalState == null) {
electedGlobalState = nodeState.metaData();
} else if (nodeState.metaData().version() > electedGlobalState.version()) {
electedGlobalState = nodeState.metaData();
}
for (ObjectCursor cursor : nodeState.metaData().indices().values()) {
indices.addTo(cursor.value.getIndex(), 1);
}
}
if (found < requiredAllocation) {
listener.onFailure("found [" + found + "] metadata states, required [" + requiredAllocation + "]");
return;
}
// update the global state, and clean the indices, we elect them in the next phase
MetaData.Builder metaDataBuilder = MetaData.builder(electedGlobalState).removeAllIndices();
assert !indices.containsKey(null);
final Object[] keys = indices.keys;
for (int i = 0; i < keys.length; i++) {
if (keys[i] != null) {
String index = (String) keys[i];
IndexMetaData electedIndexMetaData = null;
int indexMetaDataCount = 0;
for (TransportNodesListGatewayMetaState.NodeGatewayMetaState nodeState : nodesState) {
if (nodeState.metaData() == null) {
continue;
}
IndexMetaData indexMetaData = nodeState.metaData().index(index);
if (indexMetaData == null) {
continue;
}
if (electedIndexMetaData == null) {
electedIndexMetaData = indexMetaData;
} else if (indexMetaData.getVersion() > electedIndexMetaData.getVersion()) {
electedIndexMetaData = indexMetaData;
}
indexMetaDataCount++;
}
if (electedIndexMetaData != null) {
if (indexMetaDataCount < requiredAllocation) {
logger.debug("[{}] found [{}], required [{}], not adding", index, indexMetaDataCount, requiredAllocation);
}
metaDataBuilder.put(electedIndexMetaData, false);
}
}
}
ClusterState.Builder builder = ClusterState.builder(clusterName);
builder.metaData(metaDataBuilder);
listener.onSuccess(builder.build());
}
protected int calcRequiredAllocations(final String setting, final int nodeCount) {
int requiredAllocation = 1;
try {
if ("quorum".equals(setting)) {
if (nodeCount > 2) {
requiredAllocation = (nodeCount / 2) + 1;
}
} else if ("quorum-1".equals(setting) || "half".equals(setting)) {
if (nodeCount > 2) {
requiredAllocation = ((1 + nodeCount) / 2);
}
} else if ("one".equals(setting)) {
requiredAllocation = 1;
} else if ("full".equals(setting) || "all".equals(setting)) {
requiredAllocation = nodeCount;
} else if ("full-1".equals(setting) || "all-1".equals(setting)) {
if (nodeCount > 1) {
requiredAllocation = nodeCount - 1;
}
} else {
requiredAllocation = Integer.parseInt(setting);
}
} catch (Exception e) {
logger.warn("failed to derived initial_meta from value {}", setting);
}
return requiredAllocation;
}
public void reset() throws Exception {
try {
Path[] dataPaths = nodeEnv.nodeDataPaths();
logger.trace("removing node data paths: [{}]", dataPaths);
IOUtils.rm(dataPaths);
} catch (Exception ex) {
logger.debug("failed to delete shard locations", ex);
}
}
@Override
public void clusterChanged(final ClusterChangedEvent event) {
// order is important, first metaState, and then shardsState
// so dangling indices will be recorded
metaState.clusterChanged(event);
}
public interface GatewayStateRecoveredListener {
void onSuccess(ClusterState build);
void onFailure(String s);
}
}