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Allow efficient can_match phases on frozen indices (#35431)
This change adds a special caching reader that caches all relevant values for a range query to rewrite correctly in a can_match phase without actually opening the underlying directory reader. This allows frozen indices to be filtered with can_match and in-turn searched with wildcards in a efficient way since it allows us to exclude shards that won't match based on their date-ranges without opening their directory readers. Relates to #34352 Depends on #34357
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267 changes: 267 additions & 0 deletions
267
...ugin/core/src/main/java/org/elasticsearch/index/engine/RewriteCachingDirectoryReader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,267 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License; | ||
| * you may not use this file except in compliance with the Elastic License. | ||
| */ | ||
| package org.elasticsearch.index.engine; | ||
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|
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| import org.apache.lucene.index.BinaryDocValues; | ||
| import org.apache.lucene.index.DirectoryReader; | ||
| import org.apache.lucene.index.FieldInfo; | ||
| import org.apache.lucene.index.FieldInfos; | ||
| import org.apache.lucene.index.Fields; | ||
| import org.apache.lucene.index.IndexCommit; | ||
| import org.apache.lucene.index.IndexWriter; | ||
| import org.apache.lucene.index.LeafMetaData; | ||
| import org.apache.lucene.index.LeafReader; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.index.NumericDocValues; | ||
| import org.apache.lucene.index.PointValues; | ||
| import org.apache.lucene.index.SortedDocValues; | ||
| import org.apache.lucene.index.SortedNumericDocValues; | ||
| import org.apache.lucene.index.SortedSetDocValues; | ||
| import org.apache.lucene.index.StoredFieldVisitor; | ||
| import org.apache.lucene.index.Terms; | ||
| import org.apache.lucene.store.Directory; | ||
| import org.apache.lucene.util.Bits; | ||
|
|
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| import java.io.IOException; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
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| /** | ||
| * This special DirectoryReader is used to handle can_match requests against frozen indices. | ||
| * It' caches all relevant point value data for every point value field ie. min/max packed values etc. | ||
| * to hold enough information to rewrite a date range query and make a decisions if an index can match or not. | ||
| * This allows frozen indices to be searched with wildcards in a very efficient way without opening a reader on them. | ||
| */ | ||
| final class RewriteCachingDirectoryReader extends DirectoryReader { | ||
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| RewriteCachingDirectoryReader(Directory directory, List<LeafReaderContext> segmentReaders) throws | ||
| IOException { | ||
| super(directory, wrap(segmentReaders)); | ||
| } | ||
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| private static LeafReader[] wrap(List<LeafReaderContext> readers) throws IOException { | ||
| LeafReader[] wrapped = new LeafReader[readers.size()]; | ||
| int i = 0; | ||
| for (LeafReaderContext ctx : readers) { | ||
| LeafReader wrap = new RewriteCachingLeafReader(ctx.reader()); | ||
| wrapped[i++] = wrap; | ||
| } | ||
| return wrapped; | ||
| } | ||
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| @Override | ||
| protected DirectoryReader doOpenIfChanged() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| protected DirectoryReader doOpenIfChanged(IndexCommit commit) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| protected DirectoryReader doOpenIfChanged(IndexWriter writer, boolean applyAllDeletes) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| @Override | ||
| public long getVersion() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public boolean isCurrent() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public IndexCommit getIndexCommit() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| @Override | ||
| protected void doClose() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public CacheHelper getReaderCacheHelper() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| // except of a couple of selected methods everything else will | ||
| // throw a UOE which causes a can_match phase to just move to the actual phase | ||
| // later such that we never false exclude a shard if something else is used to rewrite. | ||
| private static final class RewriteCachingLeafReader extends LeafReader { | ||
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| private final int maxDoc; | ||
| private final int numDocs; | ||
| private final Map<String, PointValues> pointValuesMap; | ||
| private final FieldInfos fieldInfos; | ||
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| private RewriteCachingLeafReader(LeafReader original) throws IOException { | ||
| this.maxDoc = original.maxDoc(); | ||
| this.numDocs = original.numDocs(); | ||
| fieldInfos = original.getFieldInfos(); | ||
| Map<String, PointValues> valuesMap = new HashMap<>(); | ||
| for (FieldInfo info : fieldInfos) { | ||
| if (info.getPointIndexDimensionCount() != 0) { | ||
| PointValues pointValues = original.getPointValues(info.name); | ||
| if (pointValues != null) { // might not be in this reader | ||
| byte[] minPackedValue = pointValues.getMinPackedValue(); | ||
| byte[] maxPackedValue = pointValues.getMaxPackedValue(); | ||
| int numDimensions = pointValues.getNumIndexDimensions(); | ||
| int bytesPerDimension = pointValues.getBytesPerDimension(); | ||
| int numDataDimensions = pointValues.getNumDataDimensions(); | ||
| long size = pointValues.size(); | ||
| int docCount = pointValues.getDocCount(); | ||
| valuesMap.put(info.name, new PointValues() { | ||
| @Override | ||
| public void intersect(IntersectVisitor visitor) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public long estimatePointCount(IntersectVisitor visitor) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public byte[] getMinPackedValue() { | ||
| return minPackedValue; | ||
| } | ||
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| @Override | ||
| public byte[] getMaxPackedValue() { | ||
| return maxPackedValue; | ||
| } | ||
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| @Override | ||
| public int getNumDataDimensions() { | ||
| return numDataDimensions; | ||
| } | ||
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| @Override | ||
| public int getNumIndexDimensions() { | ||
| return numDimensions; | ||
| } | ||
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| @Override | ||
| public int getBytesPerDimension() { | ||
| return bytesPerDimension; | ||
| } | ||
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| @Override | ||
| public long size() { | ||
| return size; | ||
| } | ||
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| @Override | ||
| public int getDocCount() { | ||
| return docCount; | ||
| } | ||
| }); | ||
| } | ||
| } | ||
| } | ||
| pointValuesMap = valuesMap; | ||
| } | ||
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| @Override | ||
| public CacheHelper getCoreCacheHelper() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public Terms terms(String field) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public NumericDocValues getNumericDocValues(String field) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public BinaryDocValues getBinaryDocValues(String field) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public SortedDocValues getSortedDocValues(String field) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public SortedNumericDocValues getSortedNumericDocValues(String field) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public SortedSetDocValues getSortedSetDocValues(String field) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public NumericDocValues getNormValues(String field) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public FieldInfos getFieldInfos() { | ||
| return fieldInfos; | ||
| } | ||
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| @Override | ||
| public Bits getLiveDocs() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public PointValues getPointValues(String field) { | ||
| return pointValuesMap.get(field); | ||
| } | ||
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| @Override | ||
| public void checkIntegrity() { | ||
| } | ||
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| @Override | ||
| public LeafMetaData getMetaData() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public Fields getTermVectors(int docID) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public int numDocs() { | ||
| return numDocs; | ||
| } | ||
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| @Override | ||
| public int maxDoc() { | ||
| return maxDoc; | ||
| } | ||
|
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| @Override | ||
| public void document(int docID, StoredFieldVisitor visitor) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| protected void doClose() { | ||
| } | ||
|
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| @Override | ||
| public CacheHelper getReaderCacheHelper() { | ||
| return null; | ||
| } | ||
| } | ||
| } |
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