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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.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.util.concurrent.CountDown;
import org.elasticsearch.transport.Transport;
import org.elasticsearch.transport.TransportResponse;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import static org.elasticsearch.action.search.TransportSearchHelper.parseScrollId;
final class ClearScrollController implements Runnable {
private final DiscoveryNodes nodes;
private final SearchTransportService searchTransportService;
private final CountDown expectedOps;
private final ActionListener listener;
private final AtomicBoolean hasFailed = new AtomicBoolean(false);
private final AtomicInteger freedSearchContexts = new AtomicInteger(0);
private final Logger logger;
private final Runnable runner;
ClearScrollController(ClearScrollRequest request, ActionListener listener, DiscoveryNodes nodes, Logger logger,
SearchTransportService searchTransportService) {
this.nodes = nodes;
this.logger = logger;
this.searchTransportService = searchTransportService;
this.listener = listener;
List scrollIds = request.getScrollIds();
final int expectedOps;
if (scrollIds.size() == 1 && "_all".equals(scrollIds.get(0))) {
expectedOps = nodes.getSize();
runner = this::cleanAllScrolls;
} else {
List parsedScrollIds = new ArrayList<>();
for (String parsedScrollId : request.getScrollIds()) {
ScrollIdForNode[] context = parseScrollId(parsedScrollId).getContext();
for (ScrollIdForNode id : context) {
parsedScrollIds.add(id);
}
}
if (parsedScrollIds.isEmpty()) {
expectedOps = 0;
runner = () -> listener.onResponse(new ClearScrollResponse(true, 0));
} else {
expectedOps = parsedScrollIds.size();
runner = () -> cleanScrollIds(parsedScrollIds);
}
}
this.expectedOps = new CountDown(expectedOps);
}
@Override
public void run() {
runner.run();
}
void cleanAllScrolls() {
for (final DiscoveryNode node : nodes) {
try {
Transport.Connection connection = searchTransportService.getConnection(null, node);
searchTransportService.sendClearAllScrollContexts(connection, new ActionListener() {
@Override
public void onResponse(TransportResponse response) {
onFreedContext(true);
}
@Override
public void onFailure(Exception e) {
onFailedFreedContext(e, node);
}
});
} catch (Exception e) {
onFailedFreedContext(e, node);
}
}
}
void cleanScrollIds(List parsedScrollIds) {
SearchScrollAsyncAction.collectNodesAndRun(parsedScrollIds, nodes, searchTransportService, ActionListener.wrap(
lookup -> {
for (ScrollIdForNode target : parsedScrollIds) {
final DiscoveryNode node = lookup.apply(target.getClusterAlias(), target.getNode());
if (node == null) {
onFreedContext(false);
} else {
try {
Transport.Connection connection = searchTransportService.getConnection(target.getClusterAlias(), node);
searchTransportService.sendFreeContext(connection, target.getScrollId(),
ActionListener.wrap(freed -> onFreedContext(freed.isFreed()), e -> onFailedFreedContext(e, node)));
} catch (Exception e) {
onFailedFreedContext(e, node);
}
}
}
}, listener::onFailure));
}
private void onFreedContext(boolean freed) {
if (freed) {
freedSearchContexts.incrementAndGet();
}
if (expectedOps.countDown()) {
boolean succeeded = hasFailed.get() == false;
listener.onResponse(new ClearScrollResponse(succeeded, freedSearchContexts.get()));
}
}
private void onFailedFreedContext(Throwable e, DiscoveryNode node) {
logger.warn(() -> new ParameterizedMessage("Clear SC failed on node[{}]", node), e);
/*
* We have to set the failure marker before we count down otherwise we can expose the failure marker before we have set it to a
* racing thread successfully freeing a context. This would lead to that thread responding that the clear scroll succeeded.
*/
hasFailed.set(true);
if (expectedOps.countDown()) {
listener.onResponse(new ClearScrollResponse(false, freedSearchContexts.get()));
}
}
}