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Introduce new setting search.concurrent.max_slice to control the slic…
…e computation for concurrent segment search. It uses lucene default mechanism if the setting value is <=0 otherwise uses custom max target slice mechanism Signed-off-by: Sorabh Hamirwasia <[email protected]>
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38 changes: 38 additions & 0 deletions
38
server/src/main/java/org/opensearch/search/SearchBootstrapSettings.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,38 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.opensearch.search; | ||
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| import org.opensearch.common.settings.Setting; | ||
| import org.opensearch.common.settings.Settings; | ||
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| /** | ||
| * Keeps track of all the search related node level settings which can be accessed via static methods | ||
| */ | ||
| public class SearchBootstrapSettings { | ||
| // settings to configure maximum slice created per search request using OS custom slice computation mechanism. Default lucene | ||
| // mechanism will not be used if this setting is set with value > 0 | ||
| public static final String CONCURRENT_SEGMENT_SEARCH_TARGET_MAX_SLICE_COUNT_KEY = "search.concurrent.max_slice"; | ||
| public static final int CONCURRENT_SEGMENT_SEARCH_TARGET_MAX_SLICE_COUNT_DEFAULT_VALUE = -1; | ||
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| // value <= 0 means lucene slice computation will be used | ||
| public static final Setting<Integer> CONCURRENT_SEGMENT_SEARCH_TARGET_MAX_SLICE_COUNT_SETTING = Setting.intSetting( | ||
| CONCURRENT_SEGMENT_SEARCH_TARGET_MAX_SLICE_COUNT_KEY, | ||
| CONCURRENT_SEGMENT_SEARCH_TARGET_MAX_SLICE_COUNT_DEFAULT_VALUE, | ||
| Setting.Property.NodeScope | ||
| ); | ||
| private static Settings settings; | ||
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| public static void initialize(Settings openSearchSettings) { | ||
| settings = openSearchSettings; | ||
| } | ||
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| public static int getValueAsInt(String settingName, int defaultValue) { | ||
| return (settings != null) ? settings.getAsInt(settingName, defaultValue) : defaultValue; | ||
| } | ||
| } |
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61 changes: 61 additions & 0 deletions
61
server/src/main/java/org/opensearch/search/internal/MaxTargetSliceSupplier.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.opensearch.search.internal; | ||
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| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.search.IndexSearcher; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.Comparator; | ||
| import java.util.List; | ||
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| /** | ||
| * Supplier to compute leaf slices based on passed in leaves and max target slice count to limit the number of computed slices. It sorts | ||
| * all the leaves based on document count and then assign each leaf in round-robin fashion to the target slice count slices. Based on | ||
| * experiment results as shared in <a href=https://github.com/opensearch-project/OpenSearch/issues/7358>issue-7358</a> | ||
| * we can see this mechanism helps to achieve better tail/median latency over default lucene slice computation. | ||
| */ | ||
| public class MaxTargetSliceSupplier { | ||
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| public static IndexSearcher.LeafSlice[] getSlices(List<LeafReaderContext> leaves, int target_max_slice) { | ||
| if (target_max_slice <= 0) { | ||
| throw new IllegalArgumentException("MaxTargetSliceSupplier called with unexpected slice count of " + target_max_slice); | ||
| } | ||
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| // slice count should not exceed the segment count | ||
| int target_slice_count = Math.min(target_max_slice, leaves.size()); | ||
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| // Make a copy so we can sort: | ||
| List<LeafReaderContext> sortedLeaves = new ArrayList<>(leaves); | ||
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| // Sort by maxDoc, descending: | ||
| sortedLeaves.sort(Collections.reverseOrder(Comparator.comparingInt(l -> l.reader().maxDoc()))); | ||
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| final List<List<LeafReaderContext>> groupedLeaves = new ArrayList<>(); | ||
| for (int i = 0; i < target_slice_count; ++i) { | ||
| groupedLeaves.add(new ArrayList<>()); | ||
| } | ||
| // distribute the slices in round-robin fashion | ||
| List<LeafReaderContext> group; | ||
| for (int idx = 0; idx < sortedLeaves.size(); ++idx) { | ||
| int currentGroup = idx % target_slice_count; | ||
| group = groupedLeaves.get(currentGroup); | ||
| group.add(sortedLeaves.get(idx)); | ||
| } | ||
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| IndexSearcher.LeafSlice[] slices = new IndexSearcher.LeafSlice[target_slice_count]; | ||
| int upto = 0; | ||
| for (List<LeafReaderContext> currentLeaf : groupedLeaves) { | ||
| slices[upto] = new IndexSearcher.LeafSlice(currentLeaf); | ||
| ++upto; | ||
| } | ||
| return slices; | ||
| } | ||
| } |
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51 changes: 51 additions & 0 deletions
51
server/src/test/java/org/opensearch/search/internal/IndexReaderUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.opensearch.search.internal; | ||
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| import org.apache.lucene.analysis.standard.StandardAnalyzer; | ||
| import org.apache.lucene.document.Document; | ||
| import org.apache.lucene.document.Field; | ||
| import org.apache.lucene.document.StringField; | ||
| import org.apache.lucene.index.DirectoryReader; | ||
| import org.apache.lucene.index.IndexWriter; | ||
| import org.apache.lucene.index.IndexWriterConfig; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.index.NoMergePolicy; | ||
| import org.apache.lucene.store.Directory; | ||
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| import java.util.List; | ||
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| import static org.apache.lucene.tests.util.LuceneTestCase.newDirectory; | ||
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| public class IndexReaderUtils { | ||
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| /** | ||
| * Utility to create leafCount number of {@link LeafReaderContext} | ||
| * @param leafCount count of leaves to create | ||
| * @return created leaves | ||
| */ | ||
| public static List<LeafReaderContext> getLeaves(int leafCount) throws Exception { | ||
| final Directory directory = newDirectory(); | ||
| IndexWriter iw = new IndexWriter(directory, new IndexWriterConfig(new StandardAnalyzer()).setMergePolicy(NoMergePolicy.INSTANCE)); | ||
| for (int i = 0; i < leafCount; ++i) { | ||
| Document document = new Document(); | ||
| final String fieldValue = "value" + i; | ||
| document.add(new StringField("field1", fieldValue, Field.Store.NO)); | ||
| document.add(new StringField("field2", fieldValue, Field.Store.NO)); | ||
| iw.addDocument(document); | ||
| iw.commit(); | ||
| } | ||
| iw.close(); | ||
| DirectoryReader directoryReader = DirectoryReader.open(directory); | ||
| List<LeafReaderContext> leaves = directoryReader.leaves(); | ||
| directoryReader.close(); | ||
| directory.close(); | ||
| return leaves; | ||
| } | ||
| } |
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