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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.cursors.ObjectCursor;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.action.FailedNodeException;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateApplier;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.settings.ClusterSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.discovery.Discovery;
import org.elasticsearch.index.Index;
import org.elasticsearch.indices.IndicesService;
import java.util.Arrays;
import java.util.Map;
import java.util.function.Supplier;
public class Gateway extends AbstractComponent implements ClusterStateApplier {
private final ClusterService clusterService;
private final GatewayMetaState metaState;
private final TransportNodesListGatewayMetaState listGatewayMetaState;
private final Supplier minimumMasterNodesProvider;
private final IndicesService indicesService;
public Gateway(Settings settings, ClusterService clusterService, GatewayMetaState metaState,
TransportNodesListGatewayMetaState listGatewayMetaState, Discovery discovery,
IndicesService indicesService) {
super(settings);
this.indicesService = indicesService;
this.clusterService = clusterService;
this.metaState = metaState;
this.listGatewayMetaState = listGatewayMetaState;
this.minimumMasterNodesProvider = discovery::getMinimumMasterNodes;
clusterService.addLowPriorityApplier(this);
}
public void performStateRecovery(final GatewayStateRecoveredListener listener) throws GatewayException {
String[] nodesIds = clusterService.state().nodes().getMasterNodes().keys().toArray(String.class);
logger.trace("performing state recovery from {}", Arrays.toString(nodesIds));
TransportNodesListGatewayMetaState.NodesGatewayMetaState nodesState = listGatewayMetaState.list(nodesIds, null).actionGet();
int requiredAllocation = Math.max(1, minimumMasterNodesProvider.get());
if (nodesState.hasFailures()) {
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.getNodes()) {
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) {
Index index = (Index) keys[i];
IndexMetaData electedIndexMetaData = null;
int indexMetaDataCount = 0;
for (TransportNodesListGatewayMetaState.NodeGatewayMetaState nodeState : nodesState.getNodes()) {
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);
} // TODO if this logging statement is correct then we are missing an else here
try {
if (electedIndexMetaData.getState() == IndexMetaData.State.OPEN) {
// verify that we can actually create this index - if not we recover it as closed with lots of warn logs
indicesService.verifyIndexMetadata(electedIndexMetaData, electedIndexMetaData);
}
} catch (Exception e) {
final Index electedIndex = electedIndexMetaData.getIndex();
logger.warn(
(org.apache.logging.log4j.util.Supplier)
() -> new ParameterizedMessage("recovering index {} failed - recovering as closed", electedIndex), e);
electedIndexMetaData = IndexMetaData.builder(electedIndexMetaData).state(IndexMetaData.State.CLOSE).build();
}
metaDataBuilder.put(electedIndexMetaData, false);
}
}
}
final ClusterSettings clusterSettings = clusterService.getClusterSettings();
metaDataBuilder.persistentSettings(
clusterSettings.archiveUnknownOrInvalidSettings(
metaDataBuilder.persistentSettings(),
e -> logUnknownSetting("persistent", e),
(e, ex) -> logInvalidSetting("persistent", e, ex)));
metaDataBuilder.transientSettings(
clusterSettings.archiveUnknownOrInvalidSettings(
metaDataBuilder.transientSettings(),
e -> logUnknownSetting("transient", e),
(e, ex) -> logInvalidSetting("transient", e, ex)));
ClusterState.Builder builder = ClusterState.builder(clusterService.getClusterName());
builder.metaData(metaDataBuilder);
listener.onSuccess(builder.build());
}
private void logUnknownSetting(String settingType, Map.Entry e) {
logger.warn("ignoring unknown {} setting: [{}] with value [{}]; archiving", settingType, e.getKey(), e.getValue());
}
private void logInvalidSetting(String settingType, Map.Entry e, IllegalArgumentException ex) {
logger.warn(
(org.apache.logging.log4j.util.Supplier)
() -> new ParameterizedMessage("ignoring invalid {} setting: [{}] with value [{}]; archiving",
settingType,
e.getKey(),
e.getValue()),
ex);
}
@Override
public void applyClusterState(final ClusterChangedEvent event) {
// order is important, first metaState, and then shardsState
// so dangling indices will be recorded
metaState.applyClusterState(event);
}
public interface GatewayStateRecoveredListener {
void onSuccess(ClusterState build);
void onFailure(String s);
}
}