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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.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.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.CountDown;
import org.elasticsearch.search.action.SearchServiceTransportAction;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.BaseTransportRequestHandler;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportService;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import static org.elasticsearch.action.search.type.TransportSearchHelper.parseScrollId;
/**
*/
public class TransportClearScrollAction extends HandledTransportAction<ClearScrollRequest, ClearScrollResponse> {
private final ClusterService clusterService;
private final SearchServiceTransportAction searchServiceTransportAction;
@Inject
public TransportClearScrollAction(Settings settings, TransportService transportService, ThreadPool threadPool, ClusterService clusterService, SearchServiceTransportAction searchServiceTransportAction, ActionFilters actionFilters) {
super(settings, ClearScrollAction.NAME, threadPool, transportService, actionFilters);
this.clusterService = clusterService;
this.searchServiceTransportAction = searchServiceTransportAction;
}
@Override
protected void doExecute(ClearScrollRequest request, final ActionListener<ClearScrollResponse> listener) {
new Async(request, listener, clusterService.state()).run();
}
@Override
public ClearScrollRequest newRequestInstance() {
return new ClearScrollRequest();
}
private class Async {
final DiscoveryNodes nodes;
final CountDown expectedOps;
final ClearScrollRequest request;
final List<Tuple<String, Long>[]> contexts = new ArrayList<>();
final ActionListener<ClearScrollResponse> listener;
final AtomicReference<Throwable> expHolder;
final AtomicInteger numberOfFreedSearchContexts = new AtomicInteger(0);
private Async(ClearScrollRequest request, ActionListener<ClearScrollResponse> listener, ClusterState clusterState) {
int expectedOps = 0;
this.nodes = clusterState.nodes();
if (request.getScrollIds().size() == 1 && "_all".equals(request.getScrollIds().get(0))) {
expectedOps = nodes.size();
} else {
for (String parsedScrollId : request.getScrollIds()) {
Tuple<String, Long>[] context = parseScrollId(parsedScrollId).getContext();
expectedOps += context.length;
this.contexts.add(context);
}
}
this.request = request;
this.listener = listener;
this.expHolder = new AtomicReference<>();
this.expectedOps = new CountDown(expectedOps);
}
public void run() {
if (expectedOps.isCountedDown()) {
listener.onResponse(new ClearScrollResponse(true, 0));
return;
}
if (contexts.isEmpty()) {
for (final DiscoveryNode node : nodes) {
searchServiceTransportAction.sendClearAllScrollContexts(node, request, new ActionListener<Boolean>() {
@Override
public void onResponse(Boolean freed) {
onFreedContext(freed);
}
@Override
public void onFailure(Throwable e) {
onFailedFreedContext(e, node);
}
});
}
} else {
for (Tuple<String, Long>[] context : contexts) {
for (Tuple<String, Long> target : context) {
final DiscoveryNode node = nodes.get(target.v1());
if (node == null) {
onFreedContext(false);
continue;
}
searchServiceTransportAction.sendFreeContext(node, target.v2(), request, new ActionListener<Boolean>() {
@Override
public void onResponse(Boolean freed) {
onFreedContext(freed);
}
@Override
public void onFailure(Throwable e) {
onFailedFreedContext(e, node);
}
});
}
}
}
}
void onFreedContext(boolean freed) {
if (freed) {
numberOfFreedSearchContexts.incrementAndGet();
}
if (expectedOps.countDown()) {
boolean succeeded = expHolder.get() == null;
listener.onResponse(new ClearScrollResponse(succeeded, numberOfFreedSearchContexts.get()));
}
}
void onFailedFreedContext(Throwable e, DiscoveryNode node) {
logger.warn("Clear SC failed on node[{}]", e, node);
if (expectedOps.countDown()) {
listener.onResponse(new ClearScrollResponse(false, numberOfFreedSearchContexts.get()));
} else {
expHolder.set(e);
}
}
}
}