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Elasticsearch - Open Source, Distributed, RESTful Search Engine
/*
* 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.search;
import org.apache.lucene.search.FieldDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.util.IOUtils;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.OriginalIndices;
import org.elasticsearch.action.search.SearchTask;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.lucene.Lucene;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.common.util.concurrent.ConcurrentMapLong;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.query.InnerHitContextBuilder;
import org.elasticsearch.index.query.MatchAllQueryBuilder;
import org.elasticsearch.index.query.MatchNoneQueryBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.index.shard.IndexEventListener;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.index.shard.SearchOperationListener;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.indices.cluster.IndicesClusterStateService.AllocatedIndices.IndexRemovalReason;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.aggregations.AggregationInitializationException;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.SearchContextAggregations;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.collapse.CollapseContext;
import org.elasticsearch.search.dfs.DfsPhase;
import org.elasticsearch.search.dfs.DfsSearchResult;
import org.elasticsearch.search.fetch.FetchPhase;
import org.elasticsearch.search.fetch.FetchSearchResult;
import org.elasticsearch.search.fetch.QueryFetchSearchResult;
import org.elasticsearch.search.fetch.ScrollQueryFetchSearchResult;
import org.elasticsearch.search.fetch.ShardFetchRequest;
import org.elasticsearch.search.fetch.subphase.DocValueFieldsContext;
import org.elasticsearch.search.fetch.subphase.ScriptFieldsContext.ScriptField;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.internal.AliasFilter;
import org.elasticsearch.search.internal.InternalScrollSearchRequest;
import org.elasticsearch.search.internal.ScrollContext;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.internal.SearchContext.Lifetime;
import org.elasticsearch.search.internal.ShardSearchRequest;
import org.elasticsearch.search.profile.Profilers;
import org.elasticsearch.search.query.QueryPhase;
import org.elasticsearch.search.query.QuerySearchRequest;
import org.elasticsearch.search.query.QuerySearchResult;
import org.elasticsearch.search.query.ScrollQuerySearchResult;
import org.elasticsearch.search.rescore.RescoreBuilder;
import org.elasticsearch.search.searchafter.SearchAfterBuilder;
import org.elasticsearch.search.sort.SortAndFormats;
import org.elasticsearch.search.sort.SortBuilder;
import org.elasticsearch.search.suggest.Suggest;
import org.elasticsearch.search.suggest.completion.CompletionSuggestion;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.threadpool.ThreadPool.Cancellable;
import org.elasticsearch.threadpool.ThreadPool.Names;
import org.elasticsearch.transport.TransportRequest;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicLong;
import static org.elasticsearch.common.unit.TimeValue.timeValueMillis;
import static org.elasticsearch.common.unit.TimeValue.timeValueMinutes;
public class SearchService extends AbstractLifecycleComponent implements IndexEventListener {
// we can have 5 minutes here, since we make sure to clean with search requests and when shard/index closes
public static final Setting DEFAULT_KEEPALIVE_SETTING =
Setting.positiveTimeSetting("search.default_keep_alive", timeValueMinutes(5), Property.NodeScope);
public static final Setting KEEPALIVE_INTERVAL_SETTING =
Setting.positiveTimeSetting("search.keep_alive_interval", timeValueMinutes(1), Property.NodeScope);
/**
* Enables low-level, frequent search cancellation checks. Enabling low-level checks will make long running searches to react
* to the cancellation request faster. However, since it will produce more cancellation checks it might slow the search performance
* down.
*/
public static final Setting LOW_LEVEL_CANCELLATION_SETTING =
Setting.boolSetting("search.low_level_cancellation", false, Property.Dynamic, Property.NodeScope);
public static final TimeValue NO_TIMEOUT = timeValueMillis(-1);
public static final Setting DEFAULT_SEARCH_TIMEOUT_SETTING =
Setting.timeSetting("search.default_search_timeout", NO_TIMEOUT, Property.Dynamic, Property.NodeScope);
private final ThreadPool threadPool;
private final ClusterService clusterService;
private final IndicesService indicesService;
private final ScriptService scriptService;
private final BigArrays bigArrays;
private final DfsPhase dfsPhase = new DfsPhase();
private final QueryPhase queryPhase;
private final FetchPhase fetchPhase;
private final long defaultKeepAlive;
private volatile TimeValue defaultSearchTimeout;
private volatile boolean lowLevelCancellation;
private final Cancellable keepAliveReaper;
private final AtomicLong idGenerator = new AtomicLong();
private final ConcurrentMapLong activeContexts = ConcurrentCollections.newConcurrentMapLongWithAggressiveConcurrency();
public SearchService(ClusterService clusterService, IndicesService indicesService,
ThreadPool threadPool, ScriptService scriptService, BigArrays bigArrays, FetchPhase fetchPhase) {
super(clusterService.getSettings());
this.threadPool = threadPool;
this.clusterService = clusterService;
this.indicesService = indicesService;
this.scriptService = scriptService;
this.bigArrays = bigArrays;
this.queryPhase = new QueryPhase(settings);
this.fetchPhase = fetchPhase;
TimeValue keepAliveInterval = KEEPALIVE_INTERVAL_SETTING.get(settings);
this.defaultKeepAlive = DEFAULT_KEEPALIVE_SETTING.get(settings).millis();
this.keepAliveReaper = threadPool.scheduleWithFixedDelay(new Reaper(), keepAliveInterval, Names.SAME);
defaultSearchTimeout = DEFAULT_SEARCH_TIMEOUT_SETTING.get(settings);
clusterService.getClusterSettings().addSettingsUpdateConsumer(DEFAULT_SEARCH_TIMEOUT_SETTING, this::setDefaultSearchTimeout);
lowLevelCancellation = LOW_LEVEL_CANCELLATION_SETTING.get(settings);
clusterService.getClusterSettings().addSettingsUpdateConsumer(LOW_LEVEL_CANCELLATION_SETTING, this::setLowLevelCancellation);
}
private void setDefaultSearchTimeout(TimeValue defaultSearchTimeout) {
this.defaultSearchTimeout = defaultSearchTimeout;
}
private void setLowLevelCancellation(Boolean lowLevelCancellation) {
this.lowLevelCancellation = lowLevelCancellation;
}
@Override
public void afterIndexRemoved(Index index, IndexSettings indexSettings, IndexRemovalReason reason) {
// once an index is removed due to deletion or closing, we can just clean up all the pending search context information
// if we then close all the contexts we can get some search failures along the way which are not expected.
// it's fine to keep the contexts open if the index is still "alive"
// unfortunately we don't have a clear way to signal today why an index is closed.
// to release memory and let references to the filesystem go etc.
if (reason == IndexRemovalReason.DELETED || reason == IndexRemovalReason.CLOSED) {
freeAllContextForIndex(index);
}
}
protected void putContext(SearchContext context) {
final SearchContext previous = activeContexts.put(context.id(), context);
assert previous == null;
}
protected SearchContext removeContext(long id) {
return activeContexts.remove(id);
}
@Override
protected void doStart() {
}
@Override
protected void doStop() {
for (final SearchContext context : activeContexts.values()) {
freeContext(context.id());
}
}
@Override
protected void doClose() {
doStop();
keepAliveReaper.cancel();
}
public DfsSearchResult executeDfsPhase(ShardSearchRequest request, SearchTask task) throws IOException {
final SearchContext context = createAndPutContext(request);
context.incRef();
try {
context.setTask(task);
contextProcessing(context);
dfsPhase.execute(context);
contextProcessedSuccessfully(context);
return context.dfsResult();
} catch (Exception e) {
logger.trace("Dfs phase failed", e);
processFailure(context, e);
throw ExceptionsHelper.convertToRuntime(e);
} finally {
cleanContext(context);
}
}
/**
* Try to load the query results from the cache or execute the query phase directly if the cache cannot be used.
*/
private void loadOrExecuteQueryPhase(final ShardSearchRequest request, final SearchContext context) throws Exception {
final boolean canCache = indicesService.canCache(request, context);
context.getQueryShardContext().freezeContext();
if (canCache) {
indicesService.loadIntoContext(request, context, queryPhase);
} else {
queryPhase.execute(context);
}
}
public SearchPhaseResult executeQueryPhase(ShardSearchRequest request, SearchTask task) throws IOException {
final SearchContext context = createAndPutContext(request);
final SearchOperationListener operationListener = context.indexShard().getSearchOperationListener();
context.incRef();
boolean queryPhaseSuccess = false;
try {
context.setTask(task);
operationListener.onPreQueryPhase(context);
long time = System.nanoTime();
contextProcessing(context);
loadOrExecuteQueryPhase(request, context);
if (context.queryResult().hasSearchContext() == false && context.scrollContext() == null) {
freeContext(context.id());
} else {
contextProcessedSuccessfully(context);
}
final long afterQueryTime = System.nanoTime();
queryPhaseSuccess = true;
operationListener.onQueryPhase(context, afterQueryTime - time);
if (request.numberOfShards() == 1) {
return executeFetchPhase(context, operationListener, afterQueryTime);
}
return context.queryResult();
} catch (Exception e) {
// execution exception can happen while loading the cache, strip it
if (e instanceof ExecutionException) {
e = (e.getCause() == null || e.getCause() instanceof Exception) ?
(Exception) e.getCause() : new ElasticsearchException(e.getCause());
}
if (!queryPhaseSuccess) {
operationListener.onFailedQueryPhase(context);
}
logger.trace("Query phase failed", e);
processFailure(context, e);
throw ExceptionsHelper.convertToRuntime(e);
} finally {
cleanContext(context);
}
}
private QueryFetchSearchResult executeFetchPhase(SearchContext context, SearchOperationListener operationListener,
long afterQueryTime) {
operationListener.onPreFetchPhase(context);
try {
shortcutDocIdsToLoad(context);
fetchPhase.execute(context);
if (fetchPhaseShouldFreeContext(context)) {
freeContext(context.id());
} else {
contextProcessedSuccessfully(context);
}
} catch (Exception e) {
operationListener.onFailedFetchPhase(context);
throw ExceptionsHelper.convertToRuntime(e);
}
operationListener.onFetchPhase(context, System.nanoTime() - afterQueryTime);
return new QueryFetchSearchResult(context.queryResult(), context.fetchResult());
}
public ScrollQuerySearchResult executeQueryPhase(InternalScrollSearchRequest request, SearchTask task) {
final SearchContext context = findContext(request.id(), request);
SearchOperationListener operationListener = context.indexShard().getSearchOperationListener();
context.incRef();
try {
context.setTask(task);
operationListener.onPreQueryPhase(context);
long time = System.nanoTime();
contextProcessing(context);
processScroll(request, context);
queryPhase.execute(context);
contextProcessedSuccessfully(context);
operationListener.onQueryPhase(context, System.nanoTime() - time);
return new ScrollQuerySearchResult(context.queryResult(), context.shardTarget());
} catch (Exception e) {
operationListener.onFailedQueryPhase(context);
logger.trace("Query phase failed", e);
processFailure(context, e);
throw ExceptionsHelper.convertToRuntime(e);
} finally {
cleanContext(context);
}
}
public QuerySearchResult executeQueryPhase(QuerySearchRequest request, SearchTask task) {
final SearchContext context = findContext(request.id(), request);
context.setTask(task);
IndexShard indexShard = context.indexShard();
SearchOperationListener operationListener = indexShard.getSearchOperationListener();
context.incRef();
try {
contextProcessing(context);
context.searcher().setAggregatedDfs(request.dfs());
operationListener.onPreQueryPhase(context);
long time = System.nanoTime();
queryPhase.execute(context);
if (context.queryResult().hasSearchContext() == false && context.scrollContext() == null) {
// no hits, we can release the context since there will be no fetch phase
freeContext(context.id());
} else {
contextProcessedSuccessfully(context);
}
operationListener.onQueryPhase(context, System.nanoTime() - time);
return context.queryResult();
} catch (Exception e) {
operationListener.onFailedQueryPhase(context);
logger.trace("Query phase failed", e);
processFailure(context, e);
throw ExceptionsHelper.convertToRuntime(e);
} finally {
cleanContext(context);
}
}
private boolean fetchPhaseShouldFreeContext(SearchContext context) {
if (context.scrollContext() == null) {
// simple search, no scroll
return true;
} else {
// scroll request, but the scroll was not extended
return context.scrollContext().scroll == null;
}
}
public ScrollQueryFetchSearchResult executeFetchPhase(InternalScrollSearchRequest request, SearchTask task) {
final SearchContext context = findContext(request.id(), request);
context.incRef();
try {
context.setTask(task);
contextProcessing(context);
SearchOperationListener operationListener = context.indexShard().getSearchOperationListener();
processScroll(request, context);
operationListener.onPreQueryPhase(context);
final long time = System.nanoTime();
try {
queryPhase.execute(context);
} catch (Exception e) {
operationListener.onFailedQueryPhase(context);
throw ExceptionsHelper.convertToRuntime(e);
}
long afterQueryTime = System.nanoTime();
operationListener.onQueryPhase(context, afterQueryTime - time);
QueryFetchSearchResult fetchSearchResult = executeFetchPhase(context, operationListener, afterQueryTime);
return new ScrollQueryFetchSearchResult(fetchSearchResult,
context.shardTarget());
} catch (Exception e) {
logger.trace("Fetch phase failed", e);
processFailure(context, e);
throw ExceptionsHelper.convertToRuntime(e);
} finally {
cleanContext(context);
}
}
public FetchSearchResult executeFetchPhase(ShardFetchRequest request, SearchTask task) {
final SearchContext context = findContext(request.id(), request);
final SearchOperationListener operationListener = context.indexShard().getSearchOperationListener();
context.incRef();
try {
context.setTask(task);
contextProcessing(context);
if (request.lastEmittedDoc() != null) {
context.scrollContext().lastEmittedDoc = request.lastEmittedDoc();
}
context.docIdsToLoad(request.docIds(), 0, request.docIdsSize());
operationListener.onPreFetchPhase(context);
long time = System.nanoTime();
fetchPhase.execute(context);
if (fetchPhaseShouldFreeContext(context)) {
freeContext(request.id());
} else {
contextProcessedSuccessfully(context);
}
operationListener.onFetchPhase(context, System.nanoTime() - time);
return context.fetchResult();
} catch (Exception e) {
operationListener.onFailedFetchPhase(context);
logger.trace("Fetch phase failed", e);
processFailure(context, e);
throw ExceptionsHelper.convertToRuntime(e);
} finally {
cleanContext(context);
}
}
private SearchContext findContext(long id, TransportRequest request) throws SearchContextMissingException {
SearchContext context = activeContexts.get(id);
if (context == null) {
throw new SearchContextMissingException(id);
}
SearchOperationListener operationListener = context.indexShard().getSearchOperationListener();
try {
operationListener.validateSearchContext(context, request);
return context;
} catch (Exception e) {
processFailure(context, e);
throw e;
}
}
final SearchContext createAndPutContext(ShardSearchRequest request) throws IOException {
SearchContext context = createContext(request, null);
boolean success = false;
try {
putContext(context);
if (request.scroll() != null) {
context.indexShard().getSearchOperationListener().onNewScrollContext(context);
}
context.indexShard().getSearchOperationListener().onNewContext(context);
success = true;
return context;
} finally {
if (!success) {
freeContext(context.id());
}
}
}
final SearchContext createContext(ShardSearchRequest request, @Nullable Engine.Searcher searcher) throws IOException {
final DefaultSearchContext context = createSearchContext(request, defaultSearchTimeout, searcher);
try {
if (request.scroll() != null) {
context.scrollContext(new ScrollContext());
context.scrollContext().scroll = request.scroll();
}
parseSource(context, request.source());
// if the from and size are still not set, default them
if (context.from() == -1) {
context.from(0);
}
if (context.size() == -1) {
context.size(10);
}
// pre process
dfsPhase.preProcess(context);
queryPhase.preProcess(context);
fetchPhase.preProcess(context);
// compute the context keep alive
long keepAlive = defaultKeepAlive;
if (request.scroll() != null && request.scroll().keepAlive() != null) {
keepAlive = request.scroll().keepAlive().millis();
}
context.keepAlive(keepAlive);
context.lowLevelCancellation(lowLevelCancellation);
} catch (Exception e) {
context.close();
throw ExceptionsHelper.convertToRuntime(e);
}
return context;
}
public DefaultSearchContext createSearchContext(ShardSearchRequest request, TimeValue timeout, @Nullable Engine.Searcher searcher)
throws IOException {
IndexService indexService = indicesService.indexServiceSafe(request.shardId().getIndex());
IndexShard indexShard = indexService.getShard(request.shardId().getId());
SearchShardTarget shardTarget = new SearchShardTarget(clusterService.localNode().getId(),
indexShard.shardId(), request.getClusterAlias(), OriginalIndices.NONE);
Engine.Searcher engineSearcher = searcher == null ? indexShard.acquireSearcher("search") : searcher;
final DefaultSearchContext searchContext = new DefaultSearchContext(idGenerator.incrementAndGet(), request, shardTarget,
engineSearcher, indexService, indexShard, bigArrays, threadPool.estimatedTimeInMillisCounter(), timeout, fetchPhase);
boolean success = false;
try {
// we clone the query shard context here just for rewriting otherwise we
// might end up with incorrect state since we are using now() or script services
// during rewrite and normalized / evaluate templates etc.
request.rewrite(new QueryShardContext(searchContext.getQueryShardContext()));
assert searchContext.getQueryShardContext().isCachable();
success = true;
} finally {
if (success == false) {
IOUtils.closeWhileHandlingException(searchContext);
}
}
return searchContext;
}
private void freeAllContextForIndex(Index index) {
assert index != null;
for (SearchContext ctx : activeContexts.values()) {
if (index.equals(ctx.indexShard().shardId().getIndex())) {
freeContext(ctx.id());
}
}
}
public boolean freeContext(long id) {
final SearchContext context = removeContext(id);
if (context != null) {
assert context.refCount() > 0 : " refCount must be > 0: " + context.refCount();
try {
context.indexShard().getSearchOperationListener().onFreeContext(context);
if (context.scrollContext() != null) {
context.indexShard().getSearchOperationListener().onFreeScrollContext(context);
}
} finally {
context.close();
}
return true;
}
return false;
}
public void freeAllScrollContexts() {
for (SearchContext searchContext : activeContexts.values()) {
if (searchContext.scrollContext() != null) {
freeContext(searchContext.id());
}
}
}
private void contextProcessing(SearchContext context) {
// disable timeout while executing a search
context.accessed(-1);
}
private void contextProcessedSuccessfully(SearchContext context) {
context.accessed(threadPool.relativeTimeInMillis());
}
private void cleanContext(SearchContext context) {
try {
context.clearReleasables(Lifetime.PHASE);
context.setTask(null);
} finally {
context.decRef();
}
}
private void processFailure(SearchContext context, Exception e) {
freeContext(context.id());
try {
if (Lucene.isCorruptionException(e)) {
context.indexShard().failShard("search execution corruption failure", e);
}
} catch (Exception inner) {
inner.addSuppressed(e);
logger.warn("failed to process shard failure to (potentially) send back shard failure on corruption", inner);
}
}
private void parseSource(DefaultSearchContext context, SearchSourceBuilder source) throws SearchContextException {
// nothing to parse...
if (source == null) {
return;
}
QueryShardContext queryShardContext = context.getQueryShardContext();
context.from(source.from());
context.size(source.size());
Map innerHitBuilders = new HashMap<>();
if (source.query() != null) {
InnerHitContextBuilder.extractInnerHits(source.query(), innerHitBuilders);
context.parsedQuery(queryShardContext.toQuery(source.query()));
}
if (source.postFilter() != null) {
InnerHitContextBuilder.extractInnerHits(source.postFilter(), innerHitBuilders);
context.parsedPostFilter(queryShardContext.toQuery(source.postFilter()));
}
if (innerHitBuilders.size() > 0) {
for (Map.Entry entry : innerHitBuilders.entrySet()) {
try {
entry.getValue().build(context, context.innerHits());
} catch (IOException e) {
throw new SearchContextException(context, "failed to build inner_hits", e);
}
}
}
if (source.sorts() != null) {
try {
Optional optionalSort = SortBuilder.buildSort(source.sorts(), context.getQueryShardContext());
if (optionalSort.isPresent()) {
context.sort(optionalSort.get());
}
} catch (IOException e) {
throw new SearchContextException(context, "failed to create sort elements", e);
}
}
context.trackScores(source.trackScores());
if (source.minScore() != null) {
context.minimumScore(source.minScore());
}
if (source.profile()) {
context.setProfilers(new Profilers(context.searcher()));
}
if (source.timeout() != null) {
context.timeout(source.timeout());
}
context.terminateAfter(source.terminateAfter());
if (source.aggregations() != null) {
try {
AggregatorFactories factories = source.aggregations().build(context, null);
factories.validate();
context.aggregations(new SearchContextAggregations(factories));
} catch (IOException e) {
throw new AggregationInitializationException("Failed to create aggregators", e);
}
}
if (source.suggest() != null) {
try {
context.suggest(source.suggest().build(queryShardContext));
} catch (IOException e) {
throw new SearchContextException(context, "failed to create SuggestionSearchContext", e);
}
}
if (source.rescores() != null) {
try {
for (RescoreBuilder rescore : source.rescores()) {
context.addRescore(rescore.build(queryShardContext));
}
} catch (IOException e) {
throw new SearchContextException(context, "failed to create RescoreSearchContext", e);
}
}
if (source.explain() != null) {
context.explain(source.explain());
}
if (source.fetchSource() != null) {
context.fetchSourceContext(source.fetchSource());
}
if (source.docValueFields() != null) {
context.docValueFieldsContext(new DocValueFieldsContext(source.docValueFields()));
}
if (source.highlighter() != null) {
HighlightBuilder highlightBuilder = source.highlighter();
try {
context.highlight(highlightBuilder.build(queryShardContext));
} catch (IOException e) {
throw new SearchContextException(context, "failed to create SearchContextHighlighter", e);
}
}
if (source.scriptFields() != null) {
for (org.elasticsearch.search.builder.SearchSourceBuilder.ScriptField field : source.scriptFields()) {
SearchScript searchScript = scriptService.search(context.lookup(), field.script(), ScriptContext.Standard.SEARCH);
context.scriptFields().add(new ScriptField(field.fieldName(), searchScript, field.ignoreFailure()));
}
}
if (source.ext() != null) {
for (SearchExtBuilder searchExtBuilder : source.ext()) {
context.addSearchExt(searchExtBuilder);
}
}
if (source.version() != null) {
context.version(source.version());
}
if (source.stats() != null) {
context.groupStats(source.stats());
}
if (source.searchAfter() != null && source.searchAfter().length > 0) {
if (context.scrollContext() != null) {
throw new SearchContextException(context, "`search_after` cannot be used in a scroll context.");
}
if (context.from() > 0) {
throw new SearchContextException(context, "`from` parameter must be set to 0 when `search_after` is used.");
}
FieldDoc fieldDoc = SearchAfterBuilder.buildFieldDoc(context.sort(), source.searchAfter());
context.searchAfter(fieldDoc);
}
if (source.slice() != null) {
if (context.scrollContext() == null) {
throw new SearchContextException(context, "`slice` cannot be used outside of a scroll context");
}
context.sliceBuilder(source.slice());
}
if (source.storedFields() != null) {
if (source.storedFields().fetchFields() == false) {
if (context.version()) {
throw new SearchContextException(context, "`stored_fields` cannot be disabled if version is requested");
}
if (context.sourceRequested()) {
throw new SearchContextException(context, "`stored_fields` cannot be disabled if _source is requested");
}
}
context.storedFieldsContext(source.storedFields());
}
if (source.collapse() != null) {
final CollapseContext collapseContext = source.collapse().build(context);
context.collapse(collapseContext);
}
}
/**
* Shortcut ids to load, we load only "from" and up to "size". The phase controller
* handles this as well since the result is always size * shards for Q_A_F
*/
private void shortcutDocIdsToLoad(SearchContext context) {
final int[] docIdsToLoad;
int docsOffset = 0;
final Suggest suggest = context.queryResult().suggest();
int numSuggestDocs = 0;
final List completionSuggestions;
if (suggest != null && suggest.hasScoreDocs()) {
completionSuggestions = suggest.filter(CompletionSuggestion.class);
for (CompletionSuggestion completionSuggestion : completionSuggestions) {
numSuggestDocs += completionSuggestion.getOptions().size();
}
} else {
completionSuggestions = Collections.emptyList();
}
if (context.request().scroll() != null) {
TopDocs topDocs = context.queryResult().topDocs();
docIdsToLoad = new int[topDocs.scoreDocs.length + numSuggestDocs];
for (int i = 0; i < topDocs.scoreDocs.length; i++) {
docIdsToLoad[docsOffset++] = topDocs.scoreDocs[i].doc;
}
} else {
TopDocs topDocs = context.queryResult().topDocs();
if (topDocs.scoreDocs.length < context.from()) {
// no more docs...
docIdsToLoad = new int[numSuggestDocs];
} else {
int totalSize = context.from() + context.size();
docIdsToLoad = new int[Math.min(topDocs.scoreDocs.length - context.from(), context.size()) +
numSuggestDocs];
for (int i = context.from(); i < Math.min(totalSize, topDocs.scoreDocs.length); i++) {
docIdsToLoad[docsOffset++] = topDocs.scoreDocs[i].doc;
}
}
}
for (CompletionSuggestion completionSuggestion : completionSuggestions) {
for (CompletionSuggestion.Entry.Option option : completionSuggestion.getOptions()) {
docIdsToLoad[docsOffset++] = option.getDoc().doc;
}
}
context.docIdsToLoad(docIdsToLoad, 0, docIdsToLoad.length);
}
private void processScroll(InternalScrollSearchRequest request, SearchContext context) {
// process scroll
context.from(context.from() + context.size());
context.scrollContext().scroll = request.scroll();
// update the context keep alive based on the new scroll value
if (request.scroll() != null && request.scroll().keepAlive() != null) {
context.keepAlive(request.scroll().keepAlive().millis());
}
}
/**
* Returns the number of active contexts in this
* SearchService
*/
public int getActiveContexts() {
return this.activeContexts.size();
}
class Reaper implements Runnable {
@Override
public void run() {
final long time = threadPool.relativeTimeInMillis();
for (SearchContext context : activeContexts.values()) {
// Use the same value for both checks since lastAccessTime can
// be modified by another thread between checks!
final long lastAccessTime = context.lastAccessTime();
if (lastAccessTime == -1L) { // its being processed or timeout is disabled
continue;
}
if ((time - lastAccessTime > context.keepAlive())) {
logger.debug("freeing search context [{}], time [{}], lastAccessTime [{}], keepAlive [{}]", context.id(), time,
lastAccessTime, context.keepAlive());
freeContext(context.id());
}
}
}
}
public AliasFilter buildAliasFilter(ClusterState state, String index, String... expressions) {
return indicesService.buildAliasFilter(state, index, expressions);
}
/**
* This method does a very quick rewrite of the query and returns true if the query can potentially match any documents.
* This method can have false positives while if it returns false the query won't match any documents on the current
* shard.
*/
public boolean canMatch(ShardSearchRequest request) throws IOException {
assert request.searchType() == SearchType.QUERY_THEN_FETCH : "unexpected search type: " + request.searchType();
try (DefaultSearchContext context = createSearchContext(request, defaultSearchTimeout, null)) {
SearchSourceBuilder source = context.request().source();
if (canRewriteToMatchNone(source)) {
QueryBuilder queryBuilder = source.query();
return queryBuilder instanceof MatchNoneQueryBuilder == false;
}
return true; // null query means match_all
}
}
/**
* Returns true iff the given search source builder can be early terminated by rewriting to a match none query. Or in other words
* if the execution of a the search request can be early terminated without executing it. This is for instance not possible if
* a global aggregation is part of this request or if there is a suggest builder present.
*/
public static boolean canRewriteToMatchNone(SearchSourceBuilder source) {
if (source == null || source.query() == null || source.query() instanceof MatchAllQueryBuilder || source.suggest() != null) {
return false;
} else {
AggregatorFactories.Builder aggregations = source.aggregations();
if (aggregations != null) {
if (aggregations.mustVisitAllDocs()) {
return false;
}
}
}
return true;
}
}
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