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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.cluster.ClusterService;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.util.concurrent.AtomicArray;
import org.elasticsearch.search.action.SearchServiceTransportAction;
import org.elasticsearch.search.controller.SearchPhaseController;
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 ESLogger logger;
private final SearchServiceTransportAction searchService;
private final SearchPhaseController searchPhaseController;
private final SearchScrollRequest request;
private final ActionListener<SearchResponse> listener;
private final ParsedScrollId scrollId;
private final DiscoveryNodes nodes;
private volatile AtomicArray<ShardSearchFailure> shardFailures;
final AtomicArray<QuerySearchResult> queryResults;
final AtomicArray<FetchSearchResult> fetchResults;
private volatile ScoreDoc[] sortedShardList;
private final AtomicInteger successfulOps;
SearchScrollQueryThenFetchAsyncAction(ESLogger logger, ClusterService clusterService,
SearchServiceTransportAction searchService, SearchPhaseController searchPhaseController,
SearchScrollRequest request, ParsedScrollId scrollId, ActionListener<SearchResponse> listener) {
this.logger = logger;
this.searchService = searchService;
this.searchPhaseController = searchPhaseController;
this.request = request;
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<AtomicArray.Entry<ShardSearchFailure>> 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 [" + target.getNode() + "] not available for scroll request [" + scrollId.getSource() + "]");
}
successfulOps.decrementAndGet();
if (counter.decrementAndGet() == 0) {
try {
executeFetchPhase();
} catch (Throwable 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);
searchService.sendExecuteQuery(node, internalRequest, new ActionListener<ScrollQuerySearchResult>() {
@Override
public void onResponse(ScrollQuerySearchResult result) {
queryResults.set(shardIndex, result.queryResult());
if (counter.decrementAndGet() == 0) {
try {
executeFetchPhase();
} catch (Throwable e) {
onFailure(e);
}
}
}
@Override
public void onFailure(Throwable t) {
onQueryPhaseFailure(shardIndex, counter, searchId, t);
}
});
}
void onQueryPhaseFailure(final int shardIndex, final AtomicInteger counter, final long searchId, Throwable t) {
if (logger.isDebugEnabled()) {
logger.debug("[{}] Failed to execute query phase", t, searchId);
}
addShardFailure(shardIndex, new ShardSearchFailure(t));
successfulOps.decrementAndGet();
if (counter.decrementAndGet() == 0) {
if (successfulOps.get() == 0) {
listener.onFailure(new SearchPhaseExecutionException("query", "all shards failed", t, buildShardFailures()));
} else {
try {
executeFetchPhase();
} catch (Throwable e) {
listener.onFailure(new SearchPhaseExecutionException("query", "Fetch failed", e, ShardSearchFailure.EMPTY_ARRAY));
}
}
}
}
private void executeFetchPhase() throws Exception {
sortedShardList = searchPhaseController.sortDocs(true, queryResults);
AtomicArray<IntArrayList> docIdsToLoad = new AtomicArray<>(queryResults.length());
searchPhaseController.fillDocIdsToLoad(docIdsToLoad, sortedShardList);
if (docIdsToLoad.asList().isEmpty()) {
finishHim();
return;
}
final ScoreDoc[] lastEmittedDocPerShard = searchPhaseController.getLastEmittedDocPerShard(sortedShardList, queryResults.length());
final AtomicInteger counter = new AtomicInteger(docIdsToLoad.asList().size());
for (final AtomicArray.Entry<IntArrayList> entry : docIdsToLoad.asList()) {
IntArrayList docIds = entry.value;
final QuerySearchResult querySearchResult = queryResults.get(entry.index);
ScoreDoc lastEmittedDoc = lastEmittedDocPerShard[entry.index];
ShardFetchRequest shardFetchRequest = new ShardFetchRequest(request, querySearchResult.id(), docIds, lastEmittedDoc);
DiscoveryNode node = nodes.get(querySearchResult.shardTarget().nodeId());
searchService.sendExecuteFetchScroll(node, shardFetchRequest, new ActionListener<FetchSearchResult>() {
@Override
public void onResponse(FetchSearchResult result) {
result.shardTarget(querySearchResult.shardTarget());
fetchResults.set(entry.index, result);
if (counter.decrementAndGet() == 0) {
finishHim();
}
}
@Override
public void onFailure(Throwable 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 (Throwable e) {
listener.onFailure(new ReduceSearchPhaseException("fetch", "", e, buildShardFailures()));
}
}
private void innerFinishHim() {
InternalSearchResponse internalResponse = searchPhaseController.merge(sortedShardList, queryResults, fetchResults, request);
String scrollId = null;
if (request.scroll() != null) {
scrollId = request.scrollId();
}
listener.onResponse(new SearchResponse(internalResponse, scrollId, this.scrollId.getContext().length, successfulOps.get(),
buildTookInMillis(), buildShardFailures()));
}
}