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LUCENE-10122 Use NumericDocValue to store taxonomy parent array instead of custom term positions (#451)

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Patrick Zhai 2021-11-17 16:32:34 -08:00 committed by GitHub
parent bae095ae48
commit b4476e4318
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4 changed files with 32 additions and 116 deletions
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14
lucene/CHANGES.txt
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@ -251,7 +251,7 @@ Improvements
* LUCENE-9633: Improve match highlighter behavior for degenerate intervals (on non-existing positions).
(Dawid Weiss)
* LUCENE-9618: Do not call IntervalIterator.nextInterval after NO_MORE_DOCS is returned. (Haoyu Zhai)
* LUCENE-9618: Do not call IntervalIterator.nextInterval after NO_MORE_DOCS is returned. (Patrick Zhai)
* LUCENE-9576: Improve ConcurrentMergeScheduler settings by default, assuming modern I/O.
Previously Lucene was too conservative, jumping through hoops to detect if disks were SSD-backed.
@ -460,6 +460,8 @@ Build
Other
---------------------
* LUCENE-10122: Use NumericDocValues to store taxonomy parent array (Patrick Zhai)
* LUCENE-10136: allow 'var' declarations in source code (Dawid Weiss)
* LUCENE-9570, LUCENE-9564: Apply google java format and enforce it on source Java files.
@ -468,7 +470,7 @@ Other
* LUCENE-9631: Properly override slice() on subclasses of OffsetRange. (Dawid Weiss)
* LUCENE-9391: Upgrade HPPC to 0.8.2. (Haoyu Zhai)
* LUCENE-9391: Upgrade HPPC to 0.8.2. (Patrick Zhai)
* LUCENE-10021: Upgrade HPPC to 0.9.0. Replace usage of ...ScatterMap to ...HashMap. (Patrick Zhai)
@ -529,7 +531,7 @@ Improvements
* LUCENE-9662: Make CheckIndex concurrent by parallelizing index check across segments.
(Zach Chen, Mike McCandless, Dawid Weiss, Robert Muir)
* LUCENE-10103: Make QueryCache respect Accountable queries. (Haoyu Zhai)
* LUCENE-10103: Make QueryCache respect Accountable queries. (Patrick Zhai)
Optimizations
---------------------
@ -741,7 +743,7 @@ New Features
(Cameron VandenBerg)
* LUCENE-9694: New tool for creating a deterministic index to enable benchmarking changes
on a consistent multi-segment index even when they require re-indexing. (Haoyu Zhai)
on a consistent multi-segment index even when they require re-indexing. (Patrick Zhai)
* LUCENE-9385: Add FacetsConfig option to control which drill-down
terms are indexed for a FacetLabel (Zachary Chen)
@ -944,7 +946,7 @@ Improvements
* LUCENE-8574: Add a new ExpressionValueSource which will enforce only one value per name
per hit in dependencies, ExpressionFunctionValues will no longer
recompute already computed values (Haoyu Zhai)
recompute already computed values (Patrick Zhai)
* LUCENE-9416: Fix CheckIndex to print an invalid non-zero norm as
unsigned long when detecting corruption.
@ -1017,7 +1019,7 @@ Bug Fixes
Documentation
---------------------
* LUCENE-9424: Add a performance warning to AttributeSource.captureState javadocs (Haoyu Zhai)
* LUCENE-9424: Add a performance warning to AttributeSource.captureState javadocs (Patrick Zhai)
Changes in Runtime Behavior
---------------------

6
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/Consts.java
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@ -16,12 +16,8 @@
*/
package org.apache.lucene.facet.taxonomy.directory;
import org.apache.lucene.util.BytesRef;
/** @lucene.experimental */
abstract class Consts {
static final String FULL = "$full_path$";
static final String FIELD_PAYLOADS = "$payloads$";
static final String PAYLOAD_PARENT = "p";
static final BytesRef PAYLOAD_PARENT_BYTES_REF = new BytesRef(PAYLOAD_PARENT);
static final String FIELD_PARENT_ORDINAL_NDV = "$parent_ndv$";
}

69
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/DirectoryTaxonomyWriter.java
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@ -27,15 +27,11 @@ import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.document.BinaryDocValuesField;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.document.NumericDocValuesField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.facet.FacetsConfig;
import org.apache.lucene.facet.taxonomy.FacetLabel;
import org.apache.lucene.facet.taxonomy.TaxonomyReader;
@ -97,9 +93,6 @@ public class DirectoryTaxonomyWriter implements TaxonomyWriter {
// Records the taxonomy index epoch, updated on replaceTaxonomy as well.
private long indexEpoch;
private SinglePositionTokenStream parentStream =
new SinglePositionTokenStream(Consts.PAYLOAD_PARENT);
private Field parentStreamField;
private Field fullPathField;
private int cacheMissesUntilFill = 11;
private boolean shouldFillCache = true;
@ -176,9 +169,6 @@ public class DirectoryTaxonomyWriter implements TaxonomyWriter {
++indexEpoch;
}
FieldType ft = new FieldType(TextField.TYPE_NOT_STORED);
ft.setOmitNorms(true);
parentStreamField = new Field(Consts.FIELD_PAYLOADS, parentStream, ft);
fullPathField = new StringField(Consts.FULL, "", Field.Store.NO);
nextID = indexWriter.getDocStats().maxDoc;
@ -457,18 +447,9 @@ public class DirectoryTaxonomyWriter implements TaxonomyWriter {
* effectively synchronized as well.
*/
private int addCategoryDocument(FacetLabel categoryPath, int parent) throws IOException {
// Before Lucene 2.9, position increments >=0 were supported, so we
// added 1 to parent to allow the parent -1 (the parent of the root).
// Unfortunately, starting with Lucene 2.9, after LUCENE-1542, this is
// no longer enough, since 0 is not encoded consistently either (see
// comment in SinglePositionTokenStream). But because we must be
// backward-compatible with existing indexes, we can't just fix what
// we write here (e.g., to write parent+2), and need to do a workaround
// in the reader (which knows that anyway only category 0 has a parent
// -1).
parentStream.set(Math.max(parent + 1, 1));
Document d = new Document();
d.add(parentStreamField);
/* Lucene 9 switches to NumericDocValuesField for storing parent ordinals */
d.add(new NumericDocValuesField(Consts.FIELD_PARENT_ORDINAL_NDV, parent));
String fieldPath = FacetsConfig.pathToString(categoryPath.components, categoryPath.length);
fullPathField.setStringValue(fieldPath);
@ -497,50 +478,6 @@ public class DirectoryTaxonomyWriter implements TaxonomyWriter {
return id;
}
private static class SinglePositionTokenStream extends TokenStream {
private CharTermAttribute termAtt;
private PositionIncrementAttribute posIncrAtt;
private boolean returned;
private int val;
private final String word;
public SinglePositionTokenStream(String word) {
termAtt = addAttribute(CharTermAttribute.class);
posIncrAtt = addAttribute(PositionIncrementAttribute.class);
this.word = word;
returned = true;
}
/**
* Set the value we want to keep, as the position increment. Note that when
* TermPositions.nextPosition() is later used to retrieve this value, val-1 will be returned,
* not val.
*
* <p>IMPORTANT NOTE: Before Lucene 2.9, val&gt;=0 were safe (for val==0, the retrieved position
* would be -1). But starting with Lucene 2.9, this unfortunately changed, and only val&gt;0 are
* safe. val=0 can still be used, but don't count on the value you retrieve later (it could be 0
* or -1, depending on circumstances or versions). This change is described in Lucene's JIRA:
* LUCENE-1542.
*/
public void set(int val) {
this.val = val;
returned = false;
}
@Override
public boolean incrementToken() throws IOException {
if (returned) {
return false;
}
clearAttributes();
posIncrAtt.setPositionIncrement(val);
termAtt.setEmpty();
termAtt.append(word);
returned = true;
return true;
}
}
private void addToCache(FacetLabel categoryPath, int id) throws IOException {
if (cache.put(categoryPath, id)) {
// If cache.put() returned true, it means the cache was limited in

59
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/TaxonomyIndexArrays.java
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@ -25,9 +25,8 @@ import org.apache.lucene.facet.taxonomy.ParallelTaxonomyArrays;
import org.apache.lucene.facet.taxonomy.TaxonomyReader;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiTerms;
import org.apache.lucene.index.PostingsEnum;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.util.Accountable;
import org.apache.lucene.util.Accountables;
import org.apache.lucene.util.ArrayUtil;
@ -58,13 +57,6 @@ class TaxonomyIndexArrays extends ParallelTaxonomyArrays implements Accountable
parents = new int[reader.maxDoc()];
if (parents.length > 0) {
initParents(reader, 0);
// Starting Lucene 2.9, following the change LUCENE-1542, we can
// no longer reliably read the parent "-1" (see comment in
// LuceneTaxonomyWriter.SinglePositionTokenStream). We have no way
// to fix this in indexing without breaking backward-compatibility
// with existing indexes, so what we'll do instead is just
// hard-code the parent of ordinal 0 to be -1, and assume (as is
// indeed the case) that no other parent can be -1.
parents[0] = TaxonomyReader.INVALID_ORDINAL;
}
}
@ -130,38 +122,27 @@ class TaxonomyIndexArrays extends ParallelTaxonomyArrays implements Accountable
return;
}
// it's ok to use MultiTerms because we only iterate on one posting list.
// breaking it to loop over the leaves() only complicates code for no
// apparent gain.
PostingsEnum positions =
MultiTerms.getTermPostingsEnum(
reader, Consts.FIELD_PAYLOADS, Consts.PAYLOAD_PARENT_BYTES_REF, PostingsEnum.PAYLOADS);
for (LeafReaderContext leafContext : reader.leaves()) {
int leafDocNum = leafContext.reader().maxDoc();
if (leafContext.docBase + leafDocNum <= first) {
// skip this leaf if it does not contain new categories
continue;
}
NumericDocValues parentValues =
leafContext.reader().getNumericDocValues(Consts.FIELD_PARENT_ORDINAL_NDV);
if (parentValues == null) {
throw new CorruptIndexException(
"Parent data field " + Consts.FIELD_PARENT_ORDINAL_NDV + " not exists",
leafContext.reader().toString());
}
// shouldn't really happen, if it does, something's wrong
if (positions == null || positions.advance(first) == DocIdSetIterator.NO_MORE_DOCS) {
throw new CorruptIndexException(
"Missing parent data for category " + first, reader.toString());
}
int num = reader.maxDoc();
for (int i = first; i < num; i++) {
if (positions.docID() == i) {
if (positions.freq() == 0) { // shouldn't happen
for (int doc = Math.max(first - leafContext.docBase, 0); doc < leafDocNum; doc++) {
if (parentValues.advanceExact(doc) == false) {
throw new CorruptIndexException(
"Missing parent data for category " + i, reader.toString());
"Missing parent data for category " + (doc + leafContext.docBase), reader.toString());
}
parents[i] = positions.nextPosition();
if (positions.nextDoc() == DocIdSetIterator.NO_MORE_DOCS) {
if (i + 1 < num) {
throw new CorruptIndexException(
"Missing parent data for category " + (i + 1), reader.toString());
}
break;
}
} else { // this shouldn't happen
throw new CorruptIndexException("Missing parent data for category " + i, reader.toString());
// we're putting an int and converting it back so it should be safe
parents[doc + leafContext.docBase] = Math.toIntExact(parentValues.longValue());
}
}
}