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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.action.admin.cluster.state;
import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.master.TransportMasterNodeReadAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateObserver;
import org.elasticsearch.cluster.NotMasterException;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.metadata.MetaData.Custom;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.node.NodeClosedException;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
import java.util.function.Predicate;
public class TransportClusterStateAction extends TransportMasterNodeReadAction {
private final Logger logger = LogManager.getLogger(getClass());
static {
final String property = System.getProperty("es.cluster_state.size");
if (property != null) {
throw new IllegalArgumentException("es.cluster_state.size is no longer respected but was [" + property + "]");
}
}
@Inject
public TransportClusterStateAction(TransportService transportService, ClusterService clusterService,
ThreadPool threadPool, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver) {
super(ClusterStateAction.NAME, false, transportService, clusterService, threadPool, actionFilters,
ClusterStateRequest::new, indexNameExpressionResolver);
}
@Override
protected String executor() {
// very lightweight operation in memory, no need to fork to a thread
return ThreadPool.Names.SAME;
}
@Override
protected ClusterStateResponse read(StreamInput in) throws IOException {
return new ClusterStateResponse(in);
}
@Override
protected ClusterBlockException checkBlock(ClusterStateRequest request, ClusterState state) {
// cluster state calls are done also on a fully blocked cluster to figure out what is going
// on in the cluster. For example, which nodes have joined yet the recovery has not yet kicked
// in, we need to make sure we allow those calls
// return state.blocks().globalBlockedException(ClusterBlockLevel.METADATA);
return null;
}
@Override
protected void masterOperation(final ClusterStateRequest request, final ClusterState state,
final ActionListener listener) throws IOException {
final Predicate acceptableClusterStatePredicate
= request.waitForMetaDataVersion() == null ? clusterState -> true
: clusterState -> clusterState.metaData().version() >= request.waitForMetaDataVersion();
final Predicate acceptableClusterStateOrNotMasterPredicate = request.local()
? acceptableClusterStatePredicate
: acceptableClusterStatePredicate.or(clusterState -> clusterState.nodes().isLocalNodeElectedMaster() == false);
if (acceptableClusterStatePredicate.test(state)) {
ActionListener.completeWith(listener, () -> buildResponse(request, state));
} else {
assert acceptableClusterStateOrNotMasterPredicate.test(state) == false;
new ClusterStateObserver(state, clusterService, request.waitForTimeout(), logger, threadPool.getThreadContext())
.waitForNextChange(new ClusterStateObserver.Listener() {
@Override
public void onNewClusterState(ClusterState newState) {
if (acceptableClusterStatePredicate.test(newState)) {
ActionListener.completeWith(listener, () -> buildResponse(request, newState));
} else {
listener.onFailure(new NotMasterException(
"master stepped down waiting for metadata version " + request.waitForMetaDataVersion()));
}
}
@Override
public void onClusterServiceClose() {
listener.onFailure(new NodeClosedException(clusterService.localNode()));
}
@Override
public void onTimeout(TimeValue timeout) {
try {
listener.onResponse(new ClusterStateResponse(state.getClusterName(), null, true));
} catch (Exception e) {
listener.onFailure(e);
}
}
}, acceptableClusterStateOrNotMasterPredicate);
}
}
private ClusterStateResponse buildResponse(final ClusterStateRequest request,
final ClusterState currentState) {
logger.trace("Serving cluster state request using version {}", currentState.version());
ClusterState.Builder builder = ClusterState.builder(currentState.getClusterName());
builder.version(currentState.version());
builder.stateUUID(currentState.stateUUID());
builder.minimumMasterNodesOnPublishingMaster(currentState.getMinimumMasterNodesOnPublishingMaster());
if (request.nodes()) {
builder.nodes(currentState.nodes());
}
if (request.routingTable()) {
if (request.indices().length > 0) {
RoutingTable.Builder routingTableBuilder = RoutingTable.builder();
String[] indices = indexNameExpressionResolver.concreteIndexNames(currentState, request);
for (String filteredIndex : indices) {
if (currentState.routingTable().getIndicesRouting().containsKey(filteredIndex)) {
routingTableBuilder.add(currentState.routingTable().getIndicesRouting().get(filteredIndex));
}
}
builder.routingTable(routingTableBuilder.build());
} else {
builder.routingTable(currentState.routingTable());
}
}
if (request.blocks()) {
builder.blocks(currentState.blocks());
}
MetaData.Builder mdBuilder = MetaData.builder();
mdBuilder.clusterUUID(currentState.metaData().clusterUUID());
mdBuilder.coordinationMetaData(currentState.coordinationMetaData());
if (request.metaData()) {
if (request.indices().length > 0) {
mdBuilder.version(currentState.metaData().version());
String[] indices = indexNameExpressionResolver.concreteIndexNames(currentState, request);
for (String filteredIndex : indices) {
IndexMetaData indexMetaData = currentState.metaData().index(filteredIndex);
if (indexMetaData != null) {
mdBuilder.put(indexMetaData, false);
}
}
} else {
mdBuilder = MetaData.builder(currentState.metaData());
}
// filter out metadata that shouldn't be returned by the API
for (ObjectObjectCursor custom : currentState.metaData().customs()) {
if (custom.value.context().contains(MetaData.XContentContext.API) == false) {
mdBuilder.removeCustom(custom.key);
}
}
}
builder.metaData(mdBuilder);
if (request.customs()) {
for (ObjectObjectCursor custom : currentState.customs()) {
if (custom.value.isPrivate() == false) {
builder.putCustom(custom.key, custom.value);
}
}
}
return new ClusterStateResponse(currentState.getClusterName(), builder.build(), false);
}
}