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Elasticsearch subproject :server
/*
* 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.search;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.HandledTransportAction;
import org.elasticsearch.action.support.TransportAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.AtomicArray;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
public class TransportMultiSearchAction extends HandledTransportAction {
private final int availableProcessors;
private final ClusterService clusterService;
private final TransportAction searchAction;
@Inject
public TransportMultiSearchAction(Settings settings, ThreadPool threadPool, TransportService transportService,
ClusterService clusterService, TransportSearchAction searchAction,
ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver) {
super(settings, MultiSearchAction.NAME, threadPool, transportService, actionFilters, indexNameExpressionResolver, MultiSearchRequest::new);
this.clusterService = clusterService;
this.searchAction = searchAction;
this.availableProcessors = EsExecutors.boundedNumberOfProcessors(settings);
}
// For testing only:
TransportMultiSearchAction(ThreadPool threadPool, ActionFilters actionFilters, TransportService transportService,
ClusterService clusterService, TransportAction searchAction,
IndexNameExpressionResolver indexNameExpressionResolver, int availableProcessors) {
super(Settings.EMPTY, MultiSearchAction.NAME, threadPool, transportService, actionFilters, indexNameExpressionResolver, MultiSearchRequest::new);
this.clusterService = clusterService;
this.searchAction = searchAction;
this.availableProcessors = availableProcessors;
}
@Override
protected void doExecute(MultiSearchRequest request, ActionListener listener) {
ClusterState clusterState = clusterService.state();
clusterState.blocks().globalBlockedRaiseException(ClusterBlockLevel.READ);
int maxConcurrentSearches = request.maxConcurrentSearchRequests();
if (maxConcurrentSearches == 0) {
maxConcurrentSearches = defaultMaxConcurrentSearches(availableProcessors, clusterState);
}
Queue searchRequestSlots = new ConcurrentLinkedQueue<>();
for (int i = 0; i < request.requests().size(); i++) {
SearchRequest searchRequest = request.requests().get(i);
searchRequestSlots.add(new SearchRequestSlot(searchRequest, i));
}
int numRequests = request.requests().size();
final AtomicArray responses = new AtomicArray<>(numRequests);
final AtomicInteger responseCounter = new AtomicInteger(numRequests);
int numConcurrentSearches = Math.min(numRequests, maxConcurrentSearches);
for (int i = 0; i < numConcurrentSearches; i++) {
executeSearch(searchRequestSlots, responses, responseCounter, listener);
}
}
/*
* This is not perfect and makes a big assumption, that all nodes have the same thread pool size / have the number
* of processors and that shard of the indices the search requests go to are more or less evenly distributed across
* all nodes in the cluster. But I think it is a good enough default for most cases, if not then the default should be
* overwritten in the request itself.
*/
static int defaultMaxConcurrentSearches(int availableProcessors, ClusterState state) {
int numDateNodes = state.getNodes().getDataNodes().size();
// availableProcessors will never be larger than 32, so max defaultMaxConcurrentSearches will never be larger than 49,
// but we don't know about about other search requests that are being executed so lets cap at 10 per node
int defaultSearchThreadPoolSize = Math.min(ThreadPool.searchThreadPoolSize(availableProcessors), 10);
return Math.max(1, numDateNodes * defaultSearchThreadPoolSize);
}
void executeSearch(Queue requests, AtomicArray responses,
AtomicInteger responseCounter, ActionListener listener) {
SearchRequestSlot request = requests.poll();
if (request == null) {
// Ok... so there're no more requests then this is ok, we're then waiting for running requests to complete
return;
}
searchAction.execute(request.request, new ActionListener() {
@Override
public void onResponse(SearchResponse searchResponse) {
responses.set(request.responseSlot, new MultiSearchResponse.Item(searchResponse, null));
handleResponse();
}
@Override
public void onFailure(Exception e) {
responses.set(request.responseSlot, new MultiSearchResponse.Item(null, e));
handleResponse();
}
private void handleResponse() {
if (responseCounter.decrementAndGet() == 0) {
listener.onResponse(new MultiSearchResponse(responses.toArray(new MultiSearchResponse.Item[responses.length()])));
} else {
executeSearch(requests, responses, responseCounter, listener);
}
}
});
}
static final class SearchRequestSlot {
final SearchRequest request;
final int responseSlot;
SearchRequestSlot(SearchRequest request, int responseSlot) {
this.request = request;
this.responseSlot = responseSlot;
}
}
}