org.elasticsearch.action.search.SearchScrollQueryThenFetchAsyncAction Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :core
/*
* 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 com.carrotsearch.hppc.IntArrayList;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.apache.logging.log4j.util.Supplier;
import org.apache.lucene.search.ScoreDoc;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.util.concurrent.AtomicArray;
import org.elasticsearch.search.fetch.FetchSearchResult;
import org.elasticsearch.search.fetch.ShardFetchRequest;
import org.elasticsearch.search.internal.InternalScrollSearchRequest;
import org.elasticsearch.search.internal.InternalSearchResponse;
import org.elasticsearch.search.query.QuerySearchResult;
import org.elasticsearch.search.query.ScrollQuerySearchResult;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import static org.elasticsearch.action.search.TransportSearchHelper.internalScrollSearchRequest;
class SearchScrollQueryThenFetchAsyncAction extends AbstractAsyncAction {
private final Logger logger;
private final SearchTask task;
private final SearchTransportService searchTransportService;
private final SearchPhaseController searchPhaseController;
private final SearchScrollRequest request;
private final ActionListener listener;
private final ParsedScrollId scrollId;
private final DiscoveryNodes nodes;
private volatile AtomicArray shardFailures;
final AtomicArray queryResults;
final AtomicArray fetchResults;
private volatile ScoreDoc[] sortedShardDocs;
private final AtomicInteger successfulOps;
SearchScrollQueryThenFetchAsyncAction(Logger logger, ClusterService clusterService, SearchTransportService searchTransportService,
SearchPhaseController searchPhaseController, SearchScrollRequest request, SearchTask task,
ParsedScrollId scrollId, ActionListener listener) {
this.logger = logger;
this.searchTransportService = searchTransportService;
this.searchPhaseController = searchPhaseController;
this.request = request;
this.task = task;
this.listener = listener;
this.scrollId = scrollId;
this.nodes = clusterService.state().nodes();
this.successfulOps = new AtomicInteger(scrollId.getContext().length);
this.queryResults = new AtomicArray<>(scrollId.getContext().length);
this.fetchResults = new AtomicArray<>(scrollId.getContext().length);
}
protected final ShardSearchFailure[] buildShardFailures() {
if (shardFailures == null) {
return ShardSearchFailure.EMPTY_ARRAY;
}
List> entries = shardFailures.asList();
ShardSearchFailure[] failures = new ShardSearchFailure[entries.size()];
for (int i = 0; i < failures.length; i++) {
failures[i] = entries.get(i).value;
}
return failures;
}
// we do our best to return the shard failures, but its ok if its not fully concurrently safe
// we simply try and return as much as possible
protected final void addShardFailure(final int shardIndex, ShardSearchFailure failure) {
if (shardFailures == null) {
shardFailures = new AtomicArray<>(scrollId.getContext().length);
}
shardFailures.set(shardIndex, failure);
}
public void start() {
if (scrollId.getContext().length == 0) {
listener.onFailure(new SearchPhaseExecutionException("query", "no nodes to search on", ShardSearchFailure.EMPTY_ARRAY));
return;
}
final AtomicInteger counter = new AtomicInteger(scrollId.getContext().length);
ScrollIdForNode[] context = scrollId.getContext();
for (int i = 0; i < context.length; i++) {
ScrollIdForNode target = context[i];
DiscoveryNode node = nodes.get(target.getNode());
if (node != null) {
executeQueryPhase(i, counter, node, target.getScrollId());
} else {
if (logger.isDebugEnabled()) {
logger.debug("Node [{}] not available for scroll request [{}]", target.getNode(), scrollId.getSource());
}
successfulOps.decrementAndGet();
if (counter.decrementAndGet() == 0) {
try {
executeFetchPhase();
} catch (Exception e) {
listener.onFailure(new SearchPhaseExecutionException("query", "Fetch failed", e, ShardSearchFailure.EMPTY_ARRAY));
return;
}
}
}
}
}
private void executeQueryPhase(final int shardIndex, final AtomicInteger counter, DiscoveryNode node, final long searchId) {
InternalScrollSearchRequest internalRequest = internalScrollSearchRequest(searchId, request);
searchTransportService.sendExecuteQuery(node, internalRequest, task, new ActionListener() {
@Override
public void onResponse(ScrollQuerySearchResult result) {
queryResults.set(shardIndex, result.queryResult());
if (counter.decrementAndGet() == 0) {
try {
executeFetchPhase();
} catch (Exception e) {
onFailure(e);
}
}
}
@Override
public void onFailure(Exception t) {
onQueryPhaseFailure(shardIndex, counter, searchId, t);
}
});
}
void onQueryPhaseFailure(final int shardIndex, final AtomicInteger counter, final long searchId, Exception failure) {
if (logger.isDebugEnabled()) {
logger.debug((Supplier) () -> new ParameterizedMessage("[{}] Failed to execute query phase", searchId), failure);
}
addShardFailure(shardIndex, new ShardSearchFailure(failure));
successfulOps.decrementAndGet();
if (counter.decrementAndGet() == 0) {
if (successfulOps.get() == 0) {
listener.onFailure(new SearchPhaseExecutionException("query", "all shards failed", failure, buildShardFailures()));
} else {
try {
executeFetchPhase();
} catch (Exception e) {
e.addSuppressed(failure);
listener.onFailure(new SearchPhaseExecutionException("query", "Fetch failed", e, ShardSearchFailure.EMPTY_ARRAY));
}
}
}
}
private void executeFetchPhase() throws Exception {
sortedShardDocs = searchPhaseController.sortDocs(true, queryResults);
AtomicArray docIdsToLoad = new AtomicArray<>(queryResults.length());
searchPhaseController.fillDocIdsToLoad(docIdsToLoad, sortedShardDocs);
if (docIdsToLoad.asList().isEmpty()) {
finishHim();
return;
}
final ScoreDoc[] lastEmittedDocPerShard = searchPhaseController.getLastEmittedDocPerShard(queryResults.asList(),
sortedShardDocs, queryResults.length());
final AtomicInteger counter = new AtomicInteger(docIdsToLoad.asList().size());
for (final AtomicArray.Entry entry : docIdsToLoad.asList()) {
IntArrayList docIds = entry.value;
final QuerySearchResult querySearchResult = queryResults.get(entry.index);
ScoreDoc lastEmittedDoc = lastEmittedDocPerShard[entry.index];
ShardFetchRequest shardFetchRequest = new ShardFetchRequest(querySearchResult.id(), docIds, lastEmittedDoc);
DiscoveryNode node = nodes.get(querySearchResult.shardTarget().nodeId());
searchTransportService.sendExecuteFetchScroll(node, shardFetchRequest, task, new ActionListener() {
@Override
public void onResponse(FetchSearchResult result) {
result.shardTarget(querySearchResult.shardTarget());
fetchResults.set(entry.index, result);
if (counter.decrementAndGet() == 0) {
finishHim();
}
}
@Override
public void onFailure(Exception t) {
if (logger.isDebugEnabled()) {
logger.debug("Failed to execute fetch phase", t);
}
successfulOps.decrementAndGet();
if (counter.decrementAndGet() == 0) {
finishHim();
}
}
});
}
}
private void finishHim() {
try {
innerFinishHim();
} catch (Exception e) {
listener.onFailure(new ReduceSearchPhaseException("fetch", "inner finish failed", e, buildShardFailures()));
}
}
private void innerFinishHim() {
InternalSearchResponse internalResponse = searchPhaseController.merge(true, sortedShardDocs, queryResults, fetchResults);
String scrollId = null;
if (request.scroll() != null) {
scrollId = request.scrollId();
}
listener.onResponse(new SearchResponse(internalResponse, scrollId, this.scrollId.getContext().length, successfulOps.get(),
buildTookInMillis(), buildShardFailures()));
}
}