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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.OriginalIndices;
import org.elasticsearch.action.admin.cluster.shards.ClusterSearchShardsGroup;
import org.elasticsearch.action.admin.cluster.shards.ClusterSearchShardsRequest;
import org.elasticsearch.action.admin.cluster.shards.ClusterSearchShardsResponse;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.HandledTransportAction;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.client.Client;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.GroupShardsIterator;
import org.elasticsearch.cluster.routing.ShardIterator;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.util.concurrent.CountDown;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.query.Rewriteable;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.search.SearchPhaseResult;
import org.elasticsearch.search.SearchService;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.internal.AliasFilter;
import org.elasticsearch.search.internal.InternalSearchResponse;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.profile.ProfileShardResult;
import org.elasticsearch.search.profile.SearchProfileShardResults;
import org.elasticsearch.search.sort.FieldSortBuilder;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.RemoteClusterAware;
import org.elasticsearch.transport.RemoteClusterService;
import org.elasticsearch.transport.RemoteTransportException;
import org.elasticsearch.transport.Transport;
import org.elasticsearch.transport.TransportService;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.LongSupplier;
import static org.elasticsearch.action.search.SearchType.DFS_QUERY_THEN_FETCH;
import static org.elasticsearch.action.search.SearchType.QUERY_THEN_FETCH;
public class TransportSearchAction extends HandledTransportAction {
/** The maximum number of shards for a single search request. */
public static final Setting SHARD_COUNT_LIMIT_SETTING = Setting.longSetting(
"action.search.shard_count.limit", Long.MAX_VALUE, 1L, Property.Dynamic, Property.NodeScope);
private final ThreadPool threadPool;
private final ClusterService clusterService;
private final SearchTransportService searchTransportService;
private final RemoteClusterService remoteClusterService;
private final SearchPhaseController searchPhaseController;
private final SearchService searchService;
private final IndexNameExpressionResolver indexNameExpressionResolver;
@Inject
public TransportSearchAction(ThreadPool threadPool, TransportService transportService, SearchService searchService,
SearchTransportService searchTransportService, SearchPhaseController searchPhaseController,
ClusterService clusterService, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver) {
super(SearchAction.NAME, transportService, actionFilters, (Writeable.Reader) SearchRequest::new);
this.threadPool = threadPool;
this.searchPhaseController = searchPhaseController;
this.searchTransportService = searchTransportService;
this.remoteClusterService = searchTransportService.getRemoteClusterService();
SearchTransportService.registerRequestHandler(transportService, searchService);
this.clusterService = clusterService;
this.searchService = searchService;
this.indexNameExpressionResolver = indexNameExpressionResolver;
}
private Map buildPerIndexAliasFilter(SearchRequest request, ClusterState clusterState,
Index[] concreteIndices, Map remoteAliasMap) {
final Map aliasFilterMap = new HashMap<>();
final Set indicesAndAliases = indexNameExpressionResolver.resolveExpressions(clusterState, request.indices());
for (Index index : concreteIndices) {
clusterState.blocks().indexBlockedRaiseException(ClusterBlockLevel.READ, index.getName());
AliasFilter aliasFilter = searchService.buildAliasFilter(clusterState, index.getName(), indicesAndAliases);
assert aliasFilter != null;
aliasFilterMap.put(index.getUUID(), aliasFilter);
}
aliasFilterMap.putAll(remoteAliasMap);
return aliasFilterMap;
}
private Map resolveIndexBoosts(SearchRequest searchRequest, ClusterState clusterState) {
if (searchRequest.source() == null) {
return Collections.emptyMap();
}
SearchSourceBuilder source = searchRequest.source();
if (source.indexBoosts() == null) {
return Collections.emptyMap();
}
Map concreteIndexBoosts = new HashMap<>();
for (SearchSourceBuilder.IndexBoost ib : source.indexBoosts()) {
Index[] concreteIndices =
indexNameExpressionResolver.concreteIndices(clusterState, searchRequest.indicesOptions(), ib.getIndex());
for (Index concreteIndex : concreteIndices) {
concreteIndexBoosts.putIfAbsent(concreteIndex.getUUID(), ib.getBoost());
}
}
return Collections.unmodifiableMap(concreteIndexBoosts);
}
/**
* Search operations need two clocks. One clock is to fulfill real clock needs (e.g., resolving
* "now" to an index name). Another clock is needed for measuring how long a search operation
* took. These two uses are at odds with each other. There are many issues with using a real
* clock for measuring how long an operation took (they often lack precision, they are subject
* to moving backwards due to NTP and other such complexities, etc.). There are also issues with
* using a relative clock for reporting real time. Thus, we simply separate these two uses.
*/
static final class SearchTimeProvider {
private final long absoluteStartMillis;
private final long relativeStartNanos;
private final LongSupplier relativeCurrentNanosProvider;
/**
* Instantiates a new search time provider. The absolute start time is the real clock time
* used for resolving index expressions that include dates. The relative start time is the
* start of the search operation according to a relative clock. The total time the search
* operation took can be measured against the provided relative clock and the relative start
* time.
*
* @param absoluteStartMillis the absolute start time in milliseconds since the epoch
* @param relativeStartNanos the relative start time in nanoseconds
* @param relativeCurrentNanosProvider provides the current relative time
*/
SearchTimeProvider(
final long absoluteStartMillis,
final long relativeStartNanos,
final LongSupplier relativeCurrentNanosProvider) {
this.absoluteStartMillis = absoluteStartMillis;
this.relativeStartNanos = relativeStartNanos;
this.relativeCurrentNanosProvider = relativeCurrentNanosProvider;
}
long getAbsoluteStartMillis() {
return absoluteStartMillis;
}
long buildTookInMillis() {
return TimeUnit.NANOSECONDS.toMillis(relativeCurrentNanosProvider.getAsLong() - relativeStartNanos);
}
}
@Override
protected void doExecute(Task task, SearchRequest searchRequest, ActionListener listener) {
final long relativeStartNanos = System.nanoTime();
final SearchTimeProvider timeProvider =
new SearchTimeProvider(searchRequest.getOrCreateAbsoluteStartMillis(), relativeStartNanos, System::nanoTime);
ActionListener rewriteListener = ActionListener.wrap(source -> {
if (source != searchRequest.source()) {
// only set it if it changed - we don't allow null values to be set but it might be already null. this way we catch
// situations when source is rewritten to null due to a bug
searchRequest.source(source);
}
final ClusterState clusterState = clusterService.state();
final Map remoteClusterIndices = remoteClusterService.groupIndices(searchRequest.indicesOptions(),
searchRequest.indices(), idx -> indexNameExpressionResolver.hasIndexOrAlias(idx, clusterState));
OriginalIndices localIndices = remoteClusterIndices.remove(RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY);
if (remoteClusterIndices.isEmpty()) {
executeLocalSearch(task, timeProvider, searchRequest, localIndices, clusterState, listener);
} else {
if (shouldMinimizeRoundtrips(searchRequest)) {
ccsRemoteReduce(searchRequest, localIndices, remoteClusterIndices, timeProvider, searchService::createReduceContext,
remoteClusterService, threadPool, listener,
(r, l) -> executeLocalSearch(task, timeProvider, r, localIndices, clusterState, l));
} else {
AtomicInteger skippedClusters = new AtomicInteger(0);
collectSearchShards(searchRequest.indicesOptions(), searchRequest.preference(), searchRequest.routing(),
skippedClusters, remoteClusterIndices, remoteClusterService, threadPool,
ActionListener.wrap(
searchShardsResponses -> {
List remoteShardIterators = new ArrayList<>();
Map remoteAliasFilters = new HashMap<>();
BiFunction clusterNodeLookup = processRemoteShards(
searchShardsResponses, remoteClusterIndices, remoteShardIterators, remoteAliasFilters);
int localClusters = localIndices == null ? 0 : 1;
int totalClusters = remoteClusterIndices.size() + localClusters;
int successfulClusters = searchShardsResponses.size() + localClusters;
executeSearch((SearchTask) task, timeProvider, searchRequest, localIndices,
remoteShardIterators, clusterNodeLookup, clusterState, remoteAliasFilters, listener,
new SearchResponse.Clusters(totalClusters, successfulClusters, skippedClusters.get()));
},
listener::onFailure));
}
}
}, listener::onFailure);
if (searchRequest.source() == null) {
rewriteListener.onResponse(searchRequest.source());
} else {
Rewriteable.rewriteAndFetch(searchRequest.source(), searchService.getRewriteContext(timeProvider::getAbsoluteStartMillis),
rewriteListener);
}
}
static boolean shouldMinimizeRoundtrips(SearchRequest searchRequest) {
if (searchRequest.isCcsMinimizeRoundtrips() == false) {
return false;
}
if (searchRequest.scroll() != null) {
return false;
}
if (searchRequest.searchType() == DFS_QUERY_THEN_FETCH) {
return false;
}
SearchSourceBuilder source = searchRequest.source();
return source == null || source.collapse() == null || source.collapse().getInnerHits() == null ||
source.collapse().getInnerHits().isEmpty();
}
static void ccsRemoteReduce(SearchRequest searchRequest, OriginalIndices localIndices, Map remoteIndices,
SearchTimeProvider timeProvider, Function reduceContext,
RemoteClusterService remoteClusterService, ThreadPool threadPool, ActionListener listener,
BiConsumer> localSearchConsumer) {
if (localIndices == null && remoteIndices.size() == 1) {
//if we are searching against a single remote cluster, we simply forward the original search request to such cluster
//and we directly perform final reduction in the remote cluster
Map.Entry entry = remoteIndices.entrySet().iterator().next();
String clusterAlias = entry.getKey();
boolean skipUnavailable = remoteClusterService.isSkipUnavailable(clusterAlias);
OriginalIndices indices = entry.getValue();
SearchRequest ccsSearchRequest = SearchRequest.subSearchRequest(searchRequest, indices.indices(),
clusterAlias, timeProvider.getAbsoluteStartMillis(), true);
Client remoteClusterClient = remoteClusterService.getRemoteClusterClient(threadPool, clusterAlias);
remoteClusterClient.search(ccsSearchRequest, new ActionListener() {
@Override
public void onResponse(SearchResponse searchResponse) {
Map profileResults = searchResponse.getProfileResults();
SearchProfileShardResults profile = profileResults == null || profileResults.isEmpty()
? null : new SearchProfileShardResults(profileResults);
InternalSearchResponse internalSearchResponse = new InternalSearchResponse(searchResponse.getHits(),
(InternalAggregations) searchResponse.getAggregations(), searchResponse.getSuggest(), profile,
searchResponse.isTimedOut(), searchResponse.isTerminatedEarly(), searchResponse.getNumReducePhases());
listener.onResponse(new SearchResponse(internalSearchResponse, searchResponse.getScrollId(),
searchResponse.getTotalShards(), searchResponse.getSuccessfulShards(), searchResponse.getSkippedShards(),
timeProvider.buildTookInMillis(), searchResponse.getShardFailures(), new SearchResponse.Clusters(1, 1, 0)));
}
@Override
public void onFailure(Exception e) {
if (skipUnavailable) {
listener.onResponse(SearchResponse.empty(timeProvider::buildTookInMillis, new SearchResponse.Clusters(1, 0, 1)));
} else {
listener.onFailure(wrapRemoteClusterFailure(clusterAlias, e));
}
}
});
} else {
SearchResponseMerger searchResponseMerger = createSearchResponseMerger(searchRequest.source(), timeProvider, reduceContext);
AtomicInteger skippedClusters = new AtomicInteger(0);
final AtomicReference exceptions = new AtomicReference<>();
int totalClusters = remoteIndices.size() + (localIndices == null ? 0 : 1);
final CountDown countDown = new CountDown(totalClusters);
for (Map.Entry entry : remoteIndices.entrySet()) {
String clusterAlias = entry.getKey();
boolean skipUnavailable = remoteClusterService.isSkipUnavailable(clusterAlias);
OriginalIndices indices = entry.getValue();
SearchRequest ccsSearchRequest = SearchRequest.subSearchRequest(searchRequest, indices.indices(),
clusterAlias, timeProvider.getAbsoluteStartMillis(), false);
ActionListener ccsListener = createCCSListener(clusterAlias, skipUnavailable, countDown,
skippedClusters, exceptions, searchResponseMerger, totalClusters, listener);
Client remoteClusterClient = remoteClusterService.getRemoteClusterClient(threadPool, clusterAlias);
remoteClusterClient.search(ccsSearchRequest, ccsListener);
}
if (localIndices != null) {
ActionListener ccsListener = createCCSListener(RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY,
false, countDown, skippedClusters, exceptions, searchResponseMerger, totalClusters, listener);
SearchRequest ccsLocalSearchRequest = SearchRequest.subSearchRequest(searchRequest, localIndices.indices(),
RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY, timeProvider.getAbsoluteStartMillis(), false);
localSearchConsumer.accept(ccsLocalSearchRequest, ccsListener);
}
}
}
static SearchResponseMerger createSearchResponseMerger(SearchSourceBuilder source, SearchTimeProvider timeProvider,
Function reduceContextFunction) {
final int from;
final int size;
final int trackTotalHitsUpTo;
if (source == null) {
from = SearchService.DEFAULT_FROM;
size = SearchService.DEFAULT_SIZE;
trackTotalHitsUpTo = SearchContext.DEFAULT_TRACK_TOTAL_HITS_UP_TO;
} else {
from = source.from() == -1 ? SearchService.DEFAULT_FROM : source.from();
size = source.size() == -1 ? SearchService.DEFAULT_SIZE : source.size();
trackTotalHitsUpTo = source.trackTotalHitsUpTo() == null
? SearchContext.DEFAULT_TRACK_TOTAL_HITS_UP_TO : source.trackTotalHitsUpTo();
//here we modify the original source so we can re-use it by setting it to each outgoing search request
source.from(0);
source.size(from + size);
}
return new SearchResponseMerger(from, size, trackTotalHitsUpTo, timeProvider, reduceContextFunction);
}
static void collectSearchShards(IndicesOptions indicesOptions, String preference, String routing, AtomicInteger skippedClusters,
Map remoteIndicesByCluster, RemoteClusterService remoteClusterService,
ThreadPool threadPool, ActionListener> listener) {
final CountDown responsesCountDown = new CountDown(remoteIndicesByCluster.size());
final Map searchShardsResponses = new ConcurrentHashMap<>();
final AtomicReference exceptions = new AtomicReference<>();
for (Map.Entry entry : remoteIndicesByCluster.entrySet()) {
final String clusterAlias = entry.getKey();
boolean skipUnavailable = remoteClusterService.isSkipUnavailable(clusterAlias);
Client clusterClient = remoteClusterService.getRemoteClusterClient(threadPool, clusterAlias);
final String[] indices = entry.getValue().indices();
ClusterSearchShardsRequest searchShardsRequest = new ClusterSearchShardsRequest(indices)
.indicesOptions(indicesOptions).local(true).preference(preference).routing(routing);
clusterClient.admin().cluster().searchShards(searchShardsRequest,
new CCSActionListener>(
clusterAlias, skipUnavailable, responsesCountDown, skippedClusters, exceptions, listener) {
@Override
void innerOnResponse(ClusterSearchShardsResponse clusterSearchShardsResponse) {
searchShardsResponses.put(clusterAlias, clusterSearchShardsResponse);
}
@Override
Map createFinalResponse() {
return searchShardsResponses;
}
}
);
}
}
private static ActionListener createCCSListener(String clusterAlias, boolean skipUnavailable, CountDown countDown,
AtomicInteger skippedClusters, AtomicReference exceptions,
SearchResponseMerger searchResponseMerger, int totalClusters,
ActionListener originalListener) {
return new CCSActionListener(clusterAlias, skipUnavailable, countDown, skippedClusters,
exceptions, originalListener) {
@Override
void innerOnResponse(SearchResponse searchResponse) {
searchResponseMerger.add(searchResponse);
}
@Override
SearchResponse createFinalResponse() {
SearchResponse.Clusters clusters = new SearchResponse.Clusters(totalClusters, searchResponseMerger.numResponses(),
skippedClusters.get());
return searchResponseMerger.getMergedResponse(clusters);
}
};
}
private void executeLocalSearch(Task task, SearchTimeProvider timeProvider, SearchRequest searchRequest, OriginalIndices localIndices,
ClusterState clusterState, ActionListener listener) {
executeSearch((SearchTask)task, timeProvider, searchRequest, localIndices, Collections.emptyList(),
(clusterName, nodeId) -> null, clusterState, Collections.emptyMap(), listener, SearchResponse.Clusters.EMPTY);
}
static BiFunction processRemoteShards(Map searchShardsResponses,
Map remoteIndicesByCluster,
List remoteShardIterators,
Map aliasFilterMap) {
Map> clusterToNode = new HashMap<>();
for (Map.Entry entry : searchShardsResponses.entrySet()) {
String clusterAlias = entry.getKey();
ClusterSearchShardsResponse searchShardsResponse = entry.getValue();
HashMap idToDiscoveryNode = new HashMap<>();
clusterToNode.put(clusterAlias, idToDiscoveryNode);
for (DiscoveryNode remoteNode : searchShardsResponse.getNodes()) {
idToDiscoveryNode.put(remoteNode.getId(), remoteNode);
}
final Map indicesAndFilters = searchShardsResponse.getIndicesAndFilters();
for (ClusterSearchShardsGroup clusterSearchShardsGroup : searchShardsResponse.getGroups()) {
//add the cluster name to the remote index names for indices disambiguation
//this ends up in the hits returned with the search response
ShardId shardId = clusterSearchShardsGroup.getShardId();
final AliasFilter aliasFilter;
if (indicesAndFilters == null) {
aliasFilter = AliasFilter.EMPTY;
} else {
aliasFilter = indicesAndFilters.get(shardId.getIndexName());
assert aliasFilter != null : "alias filter must not be null for index: " + shardId.getIndex();
}
String[] aliases = aliasFilter.getAliases();
String[] finalIndices = aliases.length == 0 ? new String[] {shardId.getIndexName()} : aliases;
// here we have to map the filters to the UUID since from now on we use the uuid for the lookup
aliasFilterMap.put(shardId.getIndex().getUUID(), aliasFilter);
final OriginalIndices originalIndices = remoteIndicesByCluster.get(clusterAlias);
assert originalIndices != null : "original indices are null for clusterAlias: " + clusterAlias;
SearchShardIterator shardIterator = new SearchShardIterator(clusterAlias, shardId,
Arrays.asList(clusterSearchShardsGroup.getShards()), new OriginalIndices(finalIndices,
originalIndices.indicesOptions()));
remoteShardIterators.add(shardIterator);
}
}
return (clusterAlias, nodeId) -> {
Map clusterNodes = clusterToNode.get(clusterAlias);
if (clusterNodes == null) {
throw new IllegalArgumentException("unknown remote cluster: " + clusterAlias);
}
return clusterNodes.get(nodeId);
};
}
private Index[] resolveLocalIndices(OriginalIndices localIndices,
IndicesOptions indicesOptions,
ClusterState clusterState,
SearchTimeProvider timeProvider) {
if (localIndices == null) {
return Index.EMPTY_ARRAY; //don't search on any local index (happens when only remote indices were specified)
}
return indexNameExpressionResolver.concreteIndices(clusterState, indicesOptions,
timeProvider.getAbsoluteStartMillis(), localIndices.indices());
}
private void executeSearch(SearchTask task, SearchTimeProvider timeProvider, SearchRequest searchRequest,
OriginalIndices localIndices, List remoteShardIterators,
BiFunction remoteConnections, ClusterState clusterState,
Map remoteAliasMap, ActionListener listener,
SearchResponse.Clusters clusters) {
clusterState.blocks().globalBlockedRaiseException(ClusterBlockLevel.READ);
// TODO: I think startTime() should become part of ActionRequest and that should be used both for index name
// date math expressions and $now in scripts. This way all apis will deal with now in the same way instead
// of just for the _search api
final Index[] indices = resolveLocalIndices(localIndices, searchRequest.indicesOptions(), clusterState, timeProvider);
Map aliasFilter = buildPerIndexAliasFilter(searchRequest, clusterState, indices, remoteAliasMap);
Map> routingMap = indexNameExpressionResolver.resolveSearchRouting(clusterState, searchRequest.routing(),
searchRequest.indices());
routingMap = routingMap == null ? Collections.emptyMap() : Collections.unmodifiableMap(routingMap);
String[] concreteIndices = new String[indices.length];
for (int i = 0; i < indices.length; i++) {
concreteIndices[i] = indices[i].getName();
}
Map nodeSearchCounts = searchTransportService.getPendingSearchRequests();
GroupShardsIterator localShardsIterator = clusterService.operationRouting().searchShards(clusterState,
concreteIndices, routingMap, searchRequest.preference(), searchService.getResponseCollectorService(), nodeSearchCounts);
GroupShardsIterator shardIterators = mergeShardsIterators(localShardsIterator, localIndices,
searchRequest.getLocalClusterAlias(), remoteShardIterators);
failIfOverShardCountLimit(clusterService, shardIterators.size());
Map concreteIndexBoosts = resolveIndexBoosts(searchRequest, clusterState);
// optimize search type for cases where there is only one shard group to search on
if (shardIterators.size() == 1) {
// if we only have one group, then we always want Q_T_F, no need for DFS, and no need to do THEN since we hit one shard
searchRequest.searchType(QUERY_THEN_FETCH);
}
if (searchRequest.allowPartialSearchResults() == null) {
// No user preference defined in search request - apply cluster service default
searchRequest.allowPartialSearchResults(searchService.defaultAllowPartialSearchResults());
}
if (searchRequest.isSuggestOnly()) {
// disable request cache if we have only suggest
searchRequest.requestCache(false);
switch (searchRequest.searchType()) {
case DFS_QUERY_THEN_FETCH:
// convert to Q_T_F if we have only suggest
searchRequest.searchType(QUERY_THEN_FETCH);
break;
}
}
final DiscoveryNodes nodes = clusterState.nodes();
BiFunction connectionLookup = buildConnectionLookup(searchRequest.getLocalClusterAlias(),
nodes::get, remoteConnections, searchTransportService::getConnection);
boolean preFilterSearchShards = shouldPreFilterSearchShards(searchRequest, shardIterators);
searchAsyncAction(task, searchRequest, shardIterators, timeProvider, connectionLookup, clusterState.version(),
Collections.unmodifiableMap(aliasFilter), concreteIndexBoosts, routingMap, listener, preFilterSearchShards, clusters).start();
}
static BiFunction buildConnectionLookup(String requestClusterAlias,
Function localNodes,
BiFunction remoteNodes,
BiFunction nodeToConnection) {
return (clusterAlias, nodeId) -> {
final DiscoveryNode discoveryNode;
final boolean remoteCluster;
if (clusterAlias == null || requestClusterAlias != null) {
assert requestClusterAlias == null || requestClusterAlias.equals(clusterAlias);
discoveryNode = localNodes.apply(nodeId);
remoteCluster = false;
} else {
discoveryNode = remoteNodes.apply(clusterAlias, nodeId);
remoteCluster = true;
}
if (discoveryNode == null) {
throw new IllegalStateException("no node found for id: " + nodeId);
}
return nodeToConnection.apply(remoteCluster ? clusterAlias : null, discoveryNode);
};
}
private static boolean shouldPreFilterSearchShards(SearchRequest searchRequest,
GroupShardsIterator shardIterators) {
SearchSourceBuilder source = searchRequest.source();
return searchRequest.searchType() == QUERY_THEN_FETCH // we can't do this for DFS it needs to fan out to all shards all the time
&& (SearchService.canRewriteToMatchNone(source) || FieldSortBuilder.hasPrimaryFieldSort(source))
&& searchRequest.getPreFilterShardSize() < shardIterators.size();
}
static GroupShardsIterator mergeShardsIterators(GroupShardsIterator localShardsIterator,
OriginalIndices localIndices,
@Nullable String localClusterAlias,
List remoteShardIterators) {
List shards = new ArrayList<>(remoteShardIterators);
for (ShardIterator shardIterator : localShardsIterator) {
shards.add(new SearchShardIterator(localClusterAlias, shardIterator.shardId(), shardIterator.getShardRoutings(), localIndices));
}
return new GroupShardsIterator<>(shards);
}
private AbstractSearchAsyncAction searchAsyncAction(SearchTask task, SearchRequest searchRequest,
GroupShardsIterator shardIterators,
SearchTimeProvider timeProvider,
BiFunction connectionLookup,
long clusterStateVersion,
Map aliasFilter,
Map concreteIndexBoosts,
Map> indexRoutings,
ActionListener listener,
boolean preFilter,
SearchResponse.Clusters clusters) {
Executor executor = threadPool.executor(ThreadPool.Names.SEARCH);
if (preFilter) {
return new CanMatchPreFilterSearchPhase(logger, searchTransportService, connectionLookup,
aliasFilter, concreteIndexBoosts, indexRoutings, executor, searchRequest, listener, shardIterators,
timeProvider, clusterStateVersion, task, (iter) -> {
AbstractSearchAsyncAction action = searchAsyncAction(task, searchRequest, iter, timeProvider, connectionLookup,
clusterStateVersion, aliasFilter, concreteIndexBoosts, indexRoutings, listener, false, clusters);
return new SearchPhase(action.getName()) {
@Override
public void run() {
action.start();
}
};
}, clusters);
} else {
AbstractSearchAsyncAction searchAsyncAction;
switch (searchRequest.searchType()) {
case DFS_QUERY_THEN_FETCH:
searchAsyncAction = new SearchDfsQueryThenFetchAsyncAction(logger, searchTransportService, connectionLookup,
aliasFilter, concreteIndexBoosts, indexRoutings, searchPhaseController, executor, searchRequest, listener,
shardIterators, timeProvider, clusterStateVersion, task, clusters);
break;
case QUERY_THEN_FETCH:
searchAsyncAction = new SearchQueryThenFetchAsyncAction(logger, searchTransportService, connectionLookup,
aliasFilter, concreteIndexBoosts, indexRoutings, searchPhaseController, executor, searchRequest, listener,
shardIterators, timeProvider, clusterStateVersion, task, clusters);
break;
default:
throw new IllegalStateException("Unknown search type: [" + searchRequest.searchType() + "]");
}
return searchAsyncAction;
}
}
private static void failIfOverShardCountLimit(ClusterService clusterService, int shardCount) {
final long shardCountLimit = clusterService.getClusterSettings().get(SHARD_COUNT_LIMIT_SETTING);
if (shardCount > shardCountLimit) {
throw new IllegalArgumentException("Trying to query " + shardCount + " shards, which is over the limit of "
+ shardCountLimit + ". This limit exists because querying many shards at the same time can make the "
+ "job of the coordinating node very CPU and/or memory intensive. It is usually a better idea to "
+ "have a smaller number of larger shards. Update [" + SHARD_COUNT_LIMIT_SETTING.getKey()
+ "] to a greater value if you really want to query that many shards at the same time.");
}
}
abstract static class CCSActionListener implements ActionListener {
private final String clusterAlias;
private final boolean skipUnavailable;
private final CountDown countDown;
private final AtomicInteger skippedClusters;
private final AtomicReference exceptions;
private final ActionListener originalListener;
CCSActionListener(String clusterAlias, boolean skipUnavailable, CountDown countDown, AtomicInteger skippedClusters,
AtomicReference exceptions, ActionListener originalListener) {
this.clusterAlias = clusterAlias;
this.skipUnavailable = skipUnavailable;
this.countDown = countDown;
this.skippedClusters = skippedClusters;
this.exceptions = exceptions;
this.originalListener = originalListener;
}
@Override
public final void onResponse(Response response) {
innerOnResponse(response);
maybeFinish();
}
abstract void innerOnResponse(Response response);
@Override
public final void onFailure(Exception e) {
if (skipUnavailable) {
skippedClusters.incrementAndGet();
} else {
Exception exception = e;
if (RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY.equals(clusterAlias) == false) {
exception = wrapRemoteClusterFailure(clusterAlias, e);
}
if (exceptions.compareAndSet(null, exception) == false) {
exceptions.accumulateAndGet(exception, (previous, current) -> {
current.addSuppressed(previous);
return current;
});
}
}
maybeFinish();
}
private void maybeFinish() {
if (countDown.countDown()) {
Exception exception = exceptions.get();
if (exception == null) {
FinalResponse response;
try {
response = createFinalResponse();
} catch(Exception e) {
originalListener.onFailure(e);
return;
}
originalListener.onResponse(response);
} else {
originalListener.onFailure(exceptions.get());
}
}
}
abstract FinalResponse createFinalResponse();
}
private static RemoteTransportException wrapRemoteClusterFailure(String clusterAlias, Exception e) {
return new RemoteTransportException("error while communicating with remote cluster [" + clusterAlias + "]", e);
}
}