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/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* 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.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*/
package org.opensearch.action.search;
import org.opensearch.action.OriginalIndices;
import org.opensearch.action.admin.cluster.node.tasks.cancel.CancelTasksRequest;
import org.opensearch.action.admin.cluster.shards.ClusterSearchShardsGroup;
import org.opensearch.action.admin.cluster.shards.ClusterSearchShardsRequest;
import org.opensearch.action.admin.cluster.shards.ClusterSearchShardsResponse;
import org.opensearch.action.support.ActionFilters;
import org.opensearch.action.support.HandledTransportAction;
import org.opensearch.action.support.IndicesOptions;
import org.opensearch.action.support.TimeoutTaskCancellationUtility;
import org.opensearch.client.Client;
import org.opensearch.client.OriginSettingClient;
import org.opensearch.client.node.NodeClient;
import org.opensearch.cluster.ClusterState;
import org.opensearch.cluster.block.ClusterBlockException;
import org.opensearch.cluster.block.ClusterBlockLevel;
import org.opensearch.cluster.metadata.IndexMetadata;
import org.opensearch.cluster.metadata.IndexNameExpressionResolver;
import org.opensearch.cluster.node.DiscoveryNode;
import org.opensearch.cluster.node.DiscoveryNodes;
import org.opensearch.cluster.routing.GroupShardsIterator;
import org.opensearch.cluster.routing.OperationRouting;
import org.opensearch.cluster.routing.ShardIterator;
import org.opensearch.cluster.service.ClusterService;
import org.opensearch.common.Nullable;
import org.opensearch.common.inject.Inject;
import org.opensearch.common.settings.Setting;
import org.opensearch.common.settings.Setting.Property;
import org.opensearch.common.unit.TimeValue;
import org.opensearch.common.util.concurrent.AtomicArray;
import org.opensearch.common.util.concurrent.CountDown;
import org.opensearch.core.action.ActionListener;
import org.opensearch.core.common.Strings;
import org.opensearch.core.common.breaker.CircuitBreaker;
import org.opensearch.core.common.io.stream.NamedWriteableRegistry;
import org.opensearch.core.common.io.stream.Writeable;
import org.opensearch.core.index.Index;
import org.opensearch.core.index.shard.ShardId;
import org.opensearch.core.indices.breaker.CircuitBreakerService;
import org.opensearch.core.tasks.TaskId;
import org.opensearch.index.query.Rewriteable;
import org.opensearch.search.SearchPhaseResult;
import org.opensearch.search.SearchService;
import org.opensearch.search.SearchShardTarget;
import org.opensearch.search.aggregations.InternalAggregation;
import org.opensearch.search.aggregations.InternalAggregations;
import org.opensearch.search.builder.SearchSourceBuilder;
import org.opensearch.search.internal.AliasFilter;
import org.opensearch.search.internal.InternalSearchResponse;
import org.opensearch.search.internal.SearchContext;
import org.opensearch.search.pipeline.PipelinedRequest;
import org.opensearch.search.pipeline.SearchPipelineService;
import org.opensearch.search.profile.ProfileShardResult;
import org.opensearch.search.profile.SearchProfileShardResults;
import org.opensearch.tasks.CancellableTask;
import org.opensearch.tasks.Task;
import org.opensearch.tasks.TaskResourceTrackingService;
import org.opensearch.telemetry.metrics.MetricsRegistry;
import org.opensearch.telemetry.tracing.Span;
import org.opensearch.telemetry.tracing.SpanBuilder;
import org.opensearch.telemetry.tracing.SpanScope;
import org.opensearch.telemetry.tracing.Tracer;
import org.opensearch.telemetry.tracing.listener.TraceableActionListener;
import org.opensearch.telemetry.tracing.listener.TraceableSearchRequestOperationsListener;
import org.opensearch.threadpool.ThreadPool;
import org.opensearch.transport.RemoteClusterAware;
import org.opensearch.transport.RemoteClusterService;
import org.opensearch.transport.RemoteTransportException;
import org.opensearch.transport.Transport;
import org.opensearch.transport.TransportService;
import org.opensearch.wlm.QueryGroupTask;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
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 java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import static org.opensearch.action.admin.cluster.node.tasks.get.GetTaskAction.TASKS_ORIGIN;
import static org.opensearch.action.search.SearchType.DFS_QUERY_THEN_FETCH;
import static org.opensearch.action.search.SearchType.QUERY_THEN_FETCH;
import static org.opensearch.search.sort.FieldSortBuilder.hasPrimaryFieldSort;
/**
* Perform search action
*
* @opensearch.internal
*/
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
);
// cluster level setting for timeout based search cancellation. If search request level parameter is present then that will take
// precedence over the cluster setting value
public static final String SEARCH_CANCEL_AFTER_TIME_INTERVAL_SETTING_KEY = "search.cancel_after_time_interval";
public static final Setting SEARCH_CANCEL_AFTER_TIME_INTERVAL_SETTING = Setting.timeSetting(
SEARCH_CANCEL_AFTER_TIME_INTERVAL_SETTING_KEY,
SearchService.NO_TIMEOUT,
Setting.Property.Dynamic,
Setting.Property.NodeScope
);
public static final String SEARCH_PHASE_TOOK_ENABLED_KEY = "search.phase_took_enabled";
public static final Setting SEARCH_PHASE_TOOK_ENABLED = Setting.boolSetting(
SEARCH_PHASE_TOOK_ENABLED_KEY,
false,
Setting.Property.Dynamic,
Setting.Property.NodeScope
);
private final NodeClient client;
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;
private final NamedWriteableRegistry namedWriteableRegistry;
private final CircuitBreaker circuitBreaker;
private final SearchPipelineService searchPipelineService;
private final SearchRequestOperationsCompositeListenerFactory searchRequestOperationsCompositeListenerFactory;
private final Tracer tracer;
private final MetricsRegistry metricsRegistry;
private TaskResourceTrackingService taskResourceTrackingService;
@Inject
public TransportSearchAction(
NodeClient client,
ThreadPool threadPool,
CircuitBreakerService circuitBreakerService,
TransportService transportService,
SearchService searchService,
SearchTransportService searchTransportService,
SearchPhaseController searchPhaseController,
ClusterService clusterService,
ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver,
NamedWriteableRegistry namedWriteableRegistry,
SearchPipelineService searchPipelineService,
MetricsRegistry metricsRegistry,
SearchRequestOperationsCompositeListenerFactory searchRequestOperationsCompositeListenerFactory,
Tracer tracer,
TaskResourceTrackingService taskResourceTrackingService
) {
super(SearchAction.NAME, transportService, actionFilters, (Writeable.Reader) SearchRequest::new);
this.client = client;
this.threadPool = threadPool;
this.circuitBreaker = circuitBreakerService.getBreaker(CircuitBreaker.REQUEST);
this.searchPhaseController = searchPhaseController;
this.searchTransportService = searchTransportService;
this.remoteClusterService = searchTransportService.getRemoteClusterService();
SearchTransportService.registerRequestHandler(transportService, searchService);
this.clusterService = clusterService;
this.searchService = searchService;
this.indexNameExpressionResolver = indexNameExpressionResolver;
this.namedWriteableRegistry = namedWriteableRegistry;
this.searchPipelineService = searchPipelineService;
this.metricsRegistry = metricsRegistry;
this.searchRequestOperationsCompositeListenerFactory = searchRequestOperationsCompositeListenerFactory;
this.tracer = tracer;
this.taskResourceTrackingService = taskResourceTrackingService;
}
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.
*
* @opensearch.internal
*/
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) {
// only if task is of type CancellableTask and support cancellation on timeout, treat this request eligible for timeout based
// cancellation. There may be other top level requests like AsyncSearch which is using SearchRequest internally and has it's own
// cancellation mechanism. For such cases, the SearchRequest when created can override the createTask and set the
// cancelAfterTimeInterval to NO_TIMEOUT and bypass this mechanism
if (task instanceof CancellableTask) {
listener = TimeoutTaskCancellationUtility.wrapWithCancellationListener(
client,
(CancellableTask) task,
clusterService.getClusterSettings().get(SEARCH_CANCEL_AFTER_TIME_INTERVAL_SETTING),
listener,
e -> {}
);
}
executeRequest(task, searchRequest, this::searchAsyncAction, listener);
}
/**
* The single phase search action.
*
* @opensearch.internal
*/
public interface SinglePhaseSearchAction {
void executeOnShardTarget(
SearchTask searchTask,
SearchShardTarget target,
Transport.Connection connection,
ActionListener listener
);
}
public void executeRequest(
Task task,
SearchRequest searchRequest,
String actionName,
boolean includeSearchContext,
SinglePhaseSearchAction phaseSearchAction,
ActionListener listener
) {
executeRequest(task, searchRequest, new SearchAsyncActionProvider() {
@Override
public AbstractSearchAsyncAction asyncSearchAction(
SearchTask task,
SearchRequest searchRequest,
Executor executor,
GroupShardsIterator shardsIts,
SearchTimeProvider timeProvider,
BiFunction connectionLookup,
ClusterState clusterState,
Map aliasFilter,
Map concreteIndexBoosts,
Map> indexRoutings,
ActionListener listener,
boolean preFilter,
ThreadPool threadPool,
SearchResponse.Clusters clusters,
SearchRequestContext searchRequestContext
) {
return new AbstractSearchAsyncAction(
actionName,
logger,
searchTransportService,
connectionLookup,
aliasFilter,
concreteIndexBoosts,
indexRoutings,
executor,
searchRequest,
listener,
shardsIts,
timeProvider,
clusterState,
task,
new ArraySearchPhaseResults<>(shardsIts.size()),
searchRequest.getMaxConcurrentShardRequests(),
clusters,
searchRequestContext,
tracer
) {
@Override
protected void executePhaseOnShard(
SearchShardIterator shardIt,
SearchShardTarget shard,
SearchActionListener listener
) {
final Transport.Connection connection = getConnection(shard.getClusterAlias(), shard.getNodeId());
phaseSearchAction.executeOnShardTarget(task, shard, connection, listener);
}
@Override
protected SearchPhase getNextPhase(SearchPhaseResults results, SearchPhaseContext context) {
return new SearchPhase(getName()) {
@Override
public void run() {
final AtomicArray atomicArray = results.getAtomicArray();
sendSearchResponse(InternalSearchResponse.empty(), atomicArray);
}
};
}
@Override
boolean buildPointInTimeFromSearchResults() {
return includeSearchContext;
}
};
}
}, listener);
}
private void executeRequest(
Task task,
SearchRequest originalSearchRequest,
SearchAsyncActionProvider searchAsyncActionProvider,
ActionListener originalListener
) {
final long relativeStartNanos = System.nanoTime();
final SearchTimeProvider timeProvider = new SearchTimeProvider(
originalSearchRequest.getOrCreateAbsoluteStartMillis(),
relativeStartNanos,
System::nanoTime
);
if (originalSearchRequest.isPhaseTook() == null) {
originalSearchRequest.setPhaseTook(clusterService.getClusterSettings().get(SEARCH_PHASE_TOOK_ENABLED));
}
final Span requestSpan = tracer.startSpan(SpanBuilder.from(task, actionName));
try (final SpanScope spanScope = tracer.withSpanInScope(requestSpan)) {
SearchRequestOperationsListener.CompositeListener requestOperationsListeners;
final ActionListener updatedListener = TraceableActionListener.create(originalListener, requestSpan, tracer);
requestOperationsListeners = searchRequestOperationsCompositeListenerFactory.buildCompositeListener(
originalSearchRequest,
logger,
TraceableSearchRequestOperationsListener.create(tracer, requestSpan)
);
SearchRequestContext searchRequestContext = new SearchRequestContext(
requestOperationsListeners,
originalSearchRequest,
taskResourceTrackingService::getTaskResourceUsageFromThreadContext
);
searchRequestContext.getSearchRequestOperationsListener().onRequestStart(searchRequestContext);
// At this point either the QUERY_GROUP_ID header will be present in ThreadContext either via ActionFilter
// or HTTP header (HTTP header will be deprecated once ActionFilter is implemented)
if (task instanceof QueryGroupTask) {
((QueryGroupTask) task).setQueryGroupId(threadPool.getThreadContext());
}
PipelinedRequest searchRequest;
ActionListener listener;
try {
searchRequest = searchPipelineService.resolvePipeline(originalSearchRequest, indexNameExpressionResolver);
listener = searchRequest.transformResponseListener(updatedListener);
} catch (Exception e) {
updatedListener.onFailure(e);
return;
}
ActionListener requestTransformListener = ActionListener.wrap(sr -> {
ActionListener rewriteListener = buildRewriteListener(
sr,
task,
timeProvider,
searchAsyncActionProvider,
listener,
searchRequestContext
);
if (sr.source() == null) {
rewriteListener.onResponse(sr.source());
} else {
Rewriteable.rewriteAndFetch(
sr.source(),
searchService.getRewriteContext(timeProvider::getAbsoluteStartMillis),
rewriteListener
);
}
}, listener::onFailure);
searchRequest.transformRequest(requestTransformListener);
}
}
private ActionListener buildRewriteListener(
SearchRequest searchRequest,
Task task,
SearchTimeProvider timeProvider,
SearchAsyncActionProvider searchAsyncActionProvider,
ActionListener listener,
SearchRequestContext searchRequestContext
) {
return 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 SearchContextId searchContext;
final Map remoteClusterIndices;
if (searchRequest.pointInTimeBuilder() != null) {
searchContext = SearchContextId.decode(namedWriteableRegistry, searchRequest.pointInTimeBuilder().getId());
remoteClusterIndices = getIndicesFromSearchContexts(searchContext, searchRequest.indicesOptions());
} else {
searchContext = null;
remoteClusterIndices = remoteClusterService.groupIndices(
searchRequest.indicesOptions(),
searchRequest.indices(),
idx -> indexNameExpressionResolver.hasIndexAbstraction(idx, clusterState)
);
}
OriginalIndices localIndices = remoteClusterIndices.remove(RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY);
if (remoteClusterIndices.isEmpty()) {
executeLocalSearch(
task,
timeProvider,
searchRequest,
localIndices,
clusterState,
listener,
searchContext,
searchAsyncActionProvider,
searchRequestContext
);
} else {
if (shouldMinimizeRoundtrips(searchRequest)) {
ccsRemoteReduce(
searchRequest,
localIndices,
remoteClusterIndices,
timeProvider,
searchService.aggReduceContextBuilder(searchRequest.source()),
remoteClusterService,
threadPool,
listener,
(r, l) -> executeLocalSearch(
task,
timeProvider,
r,
localIndices,
clusterState,
l,
searchContext,
searchAsyncActionProvider,
searchRequestContext
),
searchRequestContext
);
} else {
AtomicInteger skippedClusters = new AtomicInteger(0);
collectSearchShards(
searchRequest.indicesOptions(),
searchRequest.preference(),
searchRequest.routing(),
skippedClusters,
remoteClusterIndices,
remoteClusterService,
threadPool,
ActionListener.wrap(searchShardsResponses -> {
final BiFunction clusterNodeLookup = getRemoteClusterNodeLookup(
searchShardsResponses
);
final Map remoteAliasFilters;
final List remoteShardIterators;
if (searchContext != null) {
remoteAliasFilters = searchContext.aliasFilter();
remoteShardIterators = getRemoteShardsIteratorFromPointInTime(
searchShardsResponses,
searchContext,
searchRequest.pointInTimeBuilder().getKeepAlive(),
remoteClusterIndices
);
} else {
remoteAliasFilters = getRemoteAliasFilters(searchShardsResponses);
remoteShardIterators = getRemoteShardsIterator(
searchShardsResponses,
remoteClusterIndices,
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()),
searchContext,
searchAsyncActionProvider,
searchRequestContext
);
}, listener::onFailure)
);
}
}
}, listener::onFailure);
}
static boolean shouldMinimizeRoundtrips(SearchRequest searchRequest) {
if (searchRequest.isCcsMinimizeRoundtrips() == false) {
return false;
}
if (searchRequest.scroll() != null) {
return false;
}
if (searchRequest.pointInTimeBuilder() != 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,
InternalAggregation.ReduceContextBuilder aggReduceContextBuilder,
RemoteClusterService remoteClusterService,
ThreadPool threadPool,
ActionListener listener,
BiConsumer> localSearchConsumer,
SearchRequestContext searchRequestContext
) {
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(),
searchRequestContext.getPhaseTook(),
searchResponse.getShardFailures(),
new SearchResponse.Clusters(1, 1, 0),
searchResponse.pointInTimeId()
)
);
}
@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,
aggReduceContextBuilder
);
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,
searchRequestContext
);
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,
searchRequestContext
);
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,
InternalAggregation.ReduceContextBuilder aggReduceContextBuilder
) {
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, aggReduceContextBuilder);
}
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,
SearchRequestContext searchRequestContext
) {
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, searchRequestContext);
}
};
}
private void executeLocalSearch(
Task task,
SearchTimeProvider timeProvider,
SearchRequest searchRequest,
OriginalIndices localIndices,
ClusterState clusterState,
ActionListener listener,
SearchContextId searchContext,
SearchAsyncActionProvider searchAsyncActionProvider,
SearchRequestContext searchRequestContext
) {
executeSearch(
(SearchTask) task,
timeProvider,
searchRequest,
localIndices,
Collections.emptyList(),
(clusterName, nodeId) -> null,
clusterState,
Collections.emptyMap(),
listener,
SearchResponse.Clusters.EMPTY,
searchContext,
searchAsyncActionProvider,
searchRequestContext
);
}
static BiFunction getRemoteClusterNodeLookup(Map searchShardsResp) {
Map> clusterToNode = new HashMap<>();
for (Map.Entry entry : searchShardsResp.entrySet()) {
String clusterAlias = entry.getKey();
for (DiscoveryNode remoteNode : entry.getValue().getNodes()) {
clusterToNode.computeIfAbsent(clusterAlias, k -> new HashMap<>()).put(remoteNode.getId(), remoteNode);
}
}
return (clusterAlias, nodeId) -> {
Map clusterNodes = clusterToNode.get(clusterAlias);
if (clusterNodes == null) {
throw new IllegalArgumentException("unknown remote cluster: " + clusterAlias);
}
return clusterNodes.get(nodeId);
};
}
static Map getRemoteAliasFilters(Map searchShardsResp) {
final Map aliasFilterMap = new HashMap<>();
for (Map.Entry entry : searchShardsResp.entrySet()) {
ClusterSearchShardsResponse searchShardsResponse = entry.getValue();
final Map indicesAndFilters = searchShardsResponse.getIndicesAndFilters();
for (ClusterSearchShardsGroup clusterSearchShardsGroup : searchShardsResponse.getGroups()) {
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();
}
// 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);
}
}
return aliasFilterMap;
}
static List getRemoteShardsIterator(
Map searchShardsResponses,
Map remoteIndicesByCluster,
Map aliasFilterMap
) {
final List remoteShardIterators = new ArrayList<>();
for (Map.Entry entry : searchShardsResponses.entrySet()) {
for (ClusterSearchShardsGroup clusterSearchShardsGroup : entry.getValue().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();
AliasFilter aliasFilter = aliasFilterMap.get(shardId.getIndex().getUUID());
String[] aliases = aliasFilter.getAliases();
String clusterAlias = entry.getKey();
String[] finalIndices = aliases.length == 0 ? new String[] { shardId.getIndexName() } : aliases;
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 remoteShardIterators;
}
static List getRemoteShardsIteratorFromPointInTime(
Map searchShardsResponses,
SearchContextId searchContextId,
TimeValue searchContextKeepAlive,
Map remoteClusterIndices
) {
final List remoteShardIterators = new ArrayList<>();
for (Map.Entry entry : searchShardsResponses.entrySet()) {
for (ClusterSearchShardsGroup group : entry.getValue().getGroups()) {
final ShardId shardId = group.getShardId();
final String clusterAlias = entry.getKey();
final SearchContextIdForNode perNode = searchContextId.shards().get(shardId);
assert clusterAlias.equals(perNode.getClusterAlias()) : clusterAlias + " != " + perNode.getClusterAlias();
final List targetNodes = Collections.singletonList(perNode.getNode());
SearchShardIterator shardIterator = new SearchShardIterator(
clusterAlias,
shardId,
targetNodes,
remoteClusterIndices.get(clusterAlias),
perNode.getSearchContextId(),
searchContextKeepAlive
);
remoteShardIterators.add(shardIterator);
}
}
return remoteShardIterators;
}
private Index[] resolveLocalIndices(OriginalIndices localIndices, 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, localIndices, timeProvider.getAbsoluteStartMillis());
}
private void executeSearch(
SearchTask task,
SearchTimeProvider timeProvider,
SearchRequest searchRequest,
OriginalIndices localIndices,
List remoteShardIterators,
BiFunction remoteConnections,
ClusterState clusterState,
Map remoteAliasMap,
ActionListener listener,
SearchResponse.Clusters clusters,
@Nullable SearchContextId searchContext,
SearchAsyncActionProvider searchAsyncActionProvider,
SearchRequestContext searchRequestContext
) {
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 List localShardIterators;
final Map aliasFilter;
final Map> indexRoutings;
final String[] concreteLocalIndices;
if (searchContext != null) {
assert searchRequest.pointInTimeBuilder() != null;
aliasFilter = searchContext.aliasFilter();
indexRoutings = Collections.emptyMap();
concreteLocalIndices = localIndices == null ? new String[0] : localIndices.indices();
localShardIterators = getLocalLocalShardsIteratorFromPointInTime(
clusterState,
localIndices,
searchRequest.getLocalClusterAlias(),
searchContext,
searchRequest.pointInTimeBuilder().getKeepAlive()
);
} else {
final Index[] indices = resolveLocalIndices(localIndices, clusterState, timeProvider);
Map> routingMap = indexNameExpressionResolver.resolveSearchRouting(
clusterState,
searchRequest.routing(),
searchRequest.indices()
);
routingMap = routingMap == null ? Collections.emptyMap() : Collections.unmodifiableMap(routingMap);
concreteLocalIndices = new String[indices.length];
for (int i = 0; i < indices.length; i++) {
concreteLocalIndices[i] = indices[i].getName();
}
Map nodeSearchCounts = searchTransportService.getPendingSearchRequests();
GroupShardsIterator localShardRoutings = clusterService.operationRouting()
.searchShards(
clusterState,
concreteLocalIndices,
routingMap,
searchRequest.preference(),
searchService.getResponseCollectorService(),
nodeSearchCounts
);
localShardIterators = StreamSupport.stream(localShardRoutings.spliterator(), false)
.map(it -> new SearchShardIterator(searchRequest.getLocalClusterAlias(), it.shardId(), it.getShardRoutings(), localIndices))
.collect(Collectors.toList());
aliasFilter = buildPerIndexAliasFilter(searchRequest, clusterState, indices, remoteAliasMap);
indexRoutings = routingMap;
}
final GroupShardsIterator shardIterators = mergeShardsIterators(localShardIterators, 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
);
final Executor asyncSearchExecutor = asyncSearchExecutor(concreteLocalIndices, clusterState);
final boolean preFilterSearchShards = shouldPreFilterSearchShards(
clusterState,
searchRequest,
concreteLocalIndices,
localShardIterators.size() + remoteShardIterators.size()
);
searchAsyncActionProvider.asyncSearchAction(
task,
searchRequest,
asyncSearchExecutor,
shardIterators,
timeProvider,
connectionLookup,
clusterState,
Collections.unmodifiableMap(aliasFilter),
concreteIndexBoosts,
indexRoutings,
listener,
preFilterSearchShards,
threadPool,
clusters,
searchRequestContext
).start();
}
Executor asyncSearchExecutor(final String[] indices, final ClusterState clusterState) {
final boolean onlySystemIndices = Arrays.stream(indices).allMatch(index -> {
final IndexMetadata indexMetadata = clusterState.metadata().index(index);
return indexMetadata != null && indexMetadata.isSystem();
});
return onlySystemIndices ? threadPool.executor(ThreadPool.Names.SYSTEM_READ) : threadPool.executor(ThreadPool.Names.SEARCH);
}
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);
};
}
static boolean shouldPreFilterSearchShards(ClusterState clusterState, SearchRequest searchRequest, String[] indices, int numShards) {
SearchSourceBuilder source = searchRequest.source();
Integer preFilterShardSize = searchRequest.getPreFilterShardSize();
if (preFilterShardSize == null && (hasReadOnlyIndices(indices, clusterState) || hasPrimaryFieldSort(source))) {
preFilterShardSize = 1;
} else if (preFilterShardSize == null) {
preFilterShardSize = SearchRequest.DEFAULT_PRE_FILTER_SHARD_SIZE;
}
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) || hasPrimaryFieldSort(source))
&& preFilterShardSize < numShards;
}
private static boolean hasReadOnlyIndices(String[] indices, ClusterState clusterState) {
for (String index : indices) {
ClusterBlockException writeBlock = clusterState.blocks().indexBlockedException(ClusterBlockLevel.WRITE, index);
if (writeBlock != null) {
return true;
}
}
return false;
}
static GroupShardsIterator mergeShardsIterators(
List localShardIterators,
List remoteShardIterators
) {
List shards = new ArrayList<>(remoteShardIterators);
shards.addAll(localShardIterators);
return GroupShardsIterator.sortAndCreate(shards);
}
interface SearchAsyncActionProvider {
AbstractSearchAsyncAction asyncSearchAction(
SearchTask task,
SearchRequest searchRequest,
Executor executor,
GroupShardsIterator shardIterators,
SearchTimeProvider timeProvider,
BiFunction connectionLookup,
ClusterState clusterState,
Map aliasFilter,
Map concreteIndexBoosts,
Map> indexRoutings,
ActionListener listener,
boolean preFilter,
ThreadPool threadPool,
SearchResponse.Clusters clusters,
SearchRequestContext searchRequestContext
);
}
private AbstractSearchAsyncAction searchAsyncAction(
SearchTask task,
SearchRequest searchRequest,
Executor executor,
GroupShardsIterator shardIterators,
SearchTimeProvider timeProvider,
BiFunction connectionLookup,
ClusterState clusterState,
Map aliasFilter,
Map concreteIndexBoosts,
Map> indexRoutings,
ActionListener listener,
boolean preFilter,
ThreadPool threadPool,
SearchResponse.Clusters clusters,
SearchRequestContext searchRequestContext
) {
if (preFilter) {
return new CanMatchPreFilterSearchPhase(
logger,
searchTransportService,
connectionLookup,
aliasFilter,
concreteIndexBoosts,
indexRoutings,
executor,
searchRequest,
listener,
shardIterators,
timeProvider,
clusterState,
task,
(iter) -> new WrappingSearchAsyncActionPhase(
searchAsyncAction(
task,
searchRequest,
executor,
iter,
timeProvider,
connectionLookup,
clusterState,
aliasFilter,
concreteIndexBoosts,
indexRoutings,
listener,
false,
threadPool,
clusters,
searchRequestContext
)
),
clusters,
searchRequestContext,
tracer
);
} else {
final QueryPhaseResultConsumer queryResultConsumer = searchPhaseController.newSearchPhaseResults(
executor,
circuitBreaker,
task.getProgressListener(),
searchRequest,
shardIterators.size(),
exc -> cancelTask(task, exc)
);
AbstractSearchAsyncAction searchAsyncAction;
switch (searchRequest.searchType()) {
case DFS_QUERY_THEN_FETCH:
searchAsyncAction = new SearchDfsQueryThenFetchAsyncAction(
logger,
searchTransportService,
connectionLookup,
aliasFilter,
concreteIndexBoosts,
indexRoutings,
searchPhaseController,
executor,
queryResultConsumer,
searchRequest,
listener,
shardIterators,
timeProvider,
clusterState,
task,
clusters,
searchRequestContext,
tracer
);
break;
case QUERY_THEN_FETCH:
searchAsyncAction = new SearchQueryThenFetchAsyncAction(
logger,
searchTransportService,
connectionLookup,
aliasFilter,
concreteIndexBoosts,
indexRoutings,
searchPhaseController,
executor,
queryResultConsumer,
searchRequest,
listener,
shardIterators,
timeProvider,
clusterState,
task,
clusters,
searchRequestContext,
tracer
);
break;
default:
throw new IllegalStateException("Unknown search type: [" + searchRequest.searchType() + "]");
}
return searchAsyncAction;
}
}
private void cancelTask(SearchTask task, Exception exc) {
String errorMsg = exc.getMessage() != null ? exc.getMessage() : "";
CancelTasksRequest req = new CancelTasksRequest().setTaskId(new TaskId(client.getLocalNodeId(), task.getId()))
.setReason("Fatal failure during search: " + errorMsg);
// force the origin to execute the cancellation as a system user
new OriginSettingClient(client, TASKS_ORIGIN).admin().cluster().cancelTasks(req, ActionListener.wrap(() -> {}));
}
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."
);
}
}
/**
* xcluster search listener
*
* @opensearch.internal
*/
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);
}
static Map getIndicesFromSearchContexts(SearchContextId searchContext, IndicesOptions indicesOptions) {
final Map> indices = new HashMap<>();
for (Map.Entry entry : searchContext.shards().entrySet()) {
String clusterAlias = entry.getValue().getClusterAlias() == null
? RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY
: entry.getValue().getClusterAlias();
indices.computeIfAbsent(clusterAlias, k -> new HashSet<>()).add(entry.getKey().getIndexName());
}
return indices.entrySet()
.stream()
.collect(Collectors.toMap(Map.Entry::getKey, e -> new OriginalIndices(e.getValue().toArray(new String[0]), indicesOptions)));
}
static List getLocalLocalShardsIteratorFromPointInTime(
ClusterState clusterState,
OriginalIndices originalIndices,
String localClusterAlias,
SearchContextId searchContext,
TimeValue keepAlive
) {
final List iterators = new ArrayList<>(searchContext.shards().size());
for (Map.Entry entry : searchContext.shards().entrySet()) {
final SearchContextIdForNode perNode = entry.getValue();
if (Strings.isEmpty(perNode.getClusterAlias())) {
final ShardId shardId = entry.getKey();
OperationRouting.getShards(clusterState, shardId);
final List targetNodes = Collections.singletonList(perNode.getNode());
iterators.add(
new SearchShardIterator(
localClusterAlias,
shardId,
targetNodes,
originalIndices,
perNode.getSearchContextId(),
keepAlive
)
);
}
}
return iterators;
}
}