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* 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
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package org.elasticsearch.action.search;
import com.carrotsearch.hppc.IntArrayList;
import org.apache.lucene.search.ScoreDoc;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionRunnable;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.util.concurrent.AtomicArray;
import org.elasticsearch.search.SearchShardTarget;
import org.elasticsearch.search.action.SearchServiceTransportAction;
import org.elasticsearch.search.controller.SearchPhaseController;
import org.elasticsearch.search.dfs.AggregatedDfs;
import org.elasticsearch.search.dfs.DfsSearchResult;
import org.elasticsearch.search.fetch.FetchSearchResult;
import org.elasticsearch.search.fetch.ShardFetchSearchRequest;
import org.elasticsearch.search.internal.InternalSearchResponse;
import org.elasticsearch.search.internal.ShardSearchTransportRequest;
import org.elasticsearch.search.query.QuerySearchRequest;
import org.elasticsearch.search.query.QuerySearchResult;
import org.elasticsearch.threadpool.ThreadPool;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
class SearchDfsQueryThenFetchAsyncAction extends AbstractSearchAsyncAction<DfsSearchResult> {
final AtomicArray<QuerySearchResult> queryResults;
final AtomicArray<FetchSearchResult> fetchResults;
final AtomicArray<IntArrayList> docIdsToLoad;
SearchDfsQueryThenFetchAsyncAction(ESLogger logger, SearchServiceTransportAction searchService,
ClusterService clusterService, IndexNameExpressionResolver indexNameExpressionResolver,
SearchPhaseController searchPhaseController, ThreadPool threadPool,
SearchRequest request, ActionListener<SearchResponse> listener) {
super(logger, searchService, clusterService, indexNameExpressionResolver, searchPhaseController, threadPool, request, listener);
queryResults = new AtomicArray<>(firstResults.length());
fetchResults = new AtomicArray<>(firstResults.length());
docIdsToLoad = new AtomicArray<>(firstResults.length());
}
@Override
protected String firstPhaseName() {
return "dfs";
}
@Override
protected void sendExecuteFirstPhase(DiscoveryNode node, ShardSearchTransportRequest request,
ActionListener<DfsSearchResult> listener) {
searchService.sendExecuteDfs(node, request, listener);
}
@Override
protected void moveToSecondPhase() {
final AggregatedDfs dfs = searchPhaseController.aggregateDfs(firstResults);
final AtomicInteger counter = new AtomicInteger(firstResults.asList().size());
for (final AtomicArray.Entry<DfsSearchResult> entry : firstResults.asList()) {
DfsSearchResult dfsResult = entry.value;
DiscoveryNode node = nodes.get(dfsResult.shardTarget().nodeId());
QuerySearchRequest querySearchRequest = new QuerySearchRequest(request, dfsResult.id(), dfs);
executeQuery(entry.index, dfsResult, counter, querySearchRequest, node);
}
}
void executeQuery(final int shardIndex, final DfsSearchResult dfsResult, final AtomicInteger counter,
final QuerySearchRequest querySearchRequest, final DiscoveryNode node) {
searchService.sendExecuteQuery(node, querySearchRequest, new ActionListener<QuerySearchResult>() {
@Override
public void onResponse(QuerySearchResult result) {
result.shardTarget(dfsResult.shardTarget());
queryResults.set(shardIndex, result);
if (counter.decrementAndGet() == 0) {
executeFetchPhase();
}
}
@Override
public void onFailure(Throwable t) {
try {
onQueryFailure(t, querySearchRequest, shardIndex, dfsResult, counter);
} finally {
// the query might not have been executed at all (for example because thread pool rejected
// execution) and the search context that was created in dfs phase might not be released.
// release it again to be in the safe side
sendReleaseSearchContext(querySearchRequest.id(), node);
}
}
});
}
void onQueryFailure(Throwable t, QuerySearchRequest querySearchRequest, int shardIndex, DfsSearchResult dfsResult,
AtomicInteger counter) {
if (logger.isDebugEnabled()) {
logger.debug("[{}] Failed to execute query phase", t, querySearchRequest.id());
}
this.addShardFailure(shardIndex, dfsResult.shardTarget(), t);
successfulOps.decrementAndGet();
if (counter.decrementAndGet() == 0) {
if (successfulOps.get() == 0) {
listener.onFailure(new SearchPhaseExecutionException("query", "all shards failed", buildShardFailures()));
} else {
executeFetchPhase();
}
}
}
void executeFetchPhase() {
try {
innerExecuteFetchPhase();
} catch (Throwable e) {
listener.onFailure(new ReduceSearchPhaseException("query", "", e, buildShardFailures()));
}
}
void innerExecuteFetchPhase() throws Exception {
boolean useScroll = request.scroll() != null;
sortedShardList = searchPhaseController.sortDocs(useScroll, queryResults);
searchPhaseController.fillDocIdsToLoad(docIdsToLoad, sortedShardList);
if (docIdsToLoad.asList().isEmpty()) {
finishHim();
return;
}
final ScoreDoc[] lastEmittedDocPerShard = searchPhaseController.getLastEmittedDocPerShard(
request, sortedShardList, firstResults.length()
);
final AtomicInteger counter = new AtomicInteger(docIdsToLoad.asList().size());
for (final AtomicArray.Entry<IntArrayList> entry : docIdsToLoad.asList()) {
QuerySearchResult queryResult = queryResults.get(entry.index);
DiscoveryNode node = nodes.get(queryResult.shardTarget().nodeId());
ShardFetchSearchRequest fetchSearchRequest = createFetchRequest(queryResult, entry, lastEmittedDocPerShard);
executeFetch(entry.index, queryResult.shardTarget(), counter, fetchSearchRequest, node);
}
}
void executeFetch(final int shardIndex, final SearchShardTarget shardTarget, final AtomicInteger counter,
final ShardFetchSearchRequest fetchSearchRequest, DiscoveryNode node) {
searchService.sendExecuteFetch(node, fetchSearchRequest, new ActionListener<FetchSearchResult>() {
@Override
public void onResponse(FetchSearchResult result) {
result.shardTarget(shardTarget);
fetchResults.set(shardIndex, result);
if (counter.decrementAndGet() == 0) {
finishHim();
}
}
@Override
public void onFailure(Throwable t) {
// the search context might not be cleared on the node where the fetch was executed for example
// because the action was rejected by the thread pool. in this case we need to send a dedicated
// request to clear the search context. by setting docIdsToLoad to null, the context will be cleared
// in TransportSearchTypeAction.releaseIrrelevantSearchContexts() after the search request is done.
docIdsToLoad.set(shardIndex, null);
onFetchFailure(t, fetchSearchRequest, shardIndex, shardTarget, counter);
}
});
}
void onFetchFailure(Throwable t, ShardFetchSearchRequest fetchSearchRequest, int shardIndex,
SearchShardTarget shardTarget, AtomicInteger counter) {
if (logger.isDebugEnabled()) {
logger.debug("[{}] Failed to execute fetch phase", t, fetchSearchRequest.id());
}
this.addShardFailure(shardIndex, shardTarget, t);
successfulOps.decrementAndGet();
if (counter.decrementAndGet() == 0) {
finishHim();
}
}
private void finishHim() {
threadPool.executor(ThreadPool.Names.SEARCH).execute(new ActionRunnable<SearchResponse>(listener) {
@Override
public void doRun() throws IOException {
final InternalSearchResponse internalResponse = searchPhaseController.merge(sortedShardList, queryResults,
fetchResults, request);
String scrollId = null;
if (request.scroll() != null) {
scrollId = TransportSearchHelper.buildScrollId(request.searchType(), firstResults, null);
}
listener.onResponse(new SearchResponse(internalResponse, scrollId, expectedSuccessfulOps, successfulOps.get(),
buildTookInMillis(), buildShardFailures()));
releaseIrrelevantSearchContexts(queryResults, docIdsToLoad);
}
@Override
public void onFailure(Throwable t) {
try {
ReduceSearchPhaseException failure = new ReduceSearchPhaseException("merge", "", t, buildShardFailures());
if (logger.isDebugEnabled()) {
logger.debug("failed to reduce search", failure);
}
super.onFailure(failure);
} finally {
releaseIrrelevantSearchContexts(queryResults, docIdsToLoad);
}
}
});
}
}