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[CCR] Read changes from Lucene instead of translog (#30120)
This commit adds an API to read translog snapshot from Lucene, then cut-over from the existing translog to the new API in CCR. Relates #30086 Relates #29530
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server/src/main/java/org/elasticsearch/index/engine/LuceneChangesSnapshot.java
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| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.elasticsearch.index.engine; | ||
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| import org.apache.lucene.document.LongPoint; | ||
| import org.apache.lucene.index.LeafReader; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.index.NumericDocValues; | ||
| import org.apache.lucene.index.ReaderUtil; | ||
| import org.apache.lucene.index.Term; | ||
| import org.apache.lucene.search.DocIdSetIterator; | ||
| import org.apache.lucene.search.IndexSearcher; | ||
| import org.apache.lucene.search.Query; | ||
| import org.apache.lucene.search.Sort; | ||
| import org.apache.lucene.search.SortField; | ||
| import org.apache.lucene.search.SortedNumericSortField; | ||
| import org.apache.lucene.search.TopDocs; | ||
| import org.elasticsearch.common.bytes.BytesReference; | ||
| import org.elasticsearch.common.lucene.Lucene; | ||
| import org.elasticsearch.index.VersionType; | ||
| import org.elasticsearch.index.fieldvisitor.FieldsVisitor; | ||
| import org.elasticsearch.index.mapper.IdFieldMapper; | ||
| import org.elasticsearch.index.mapper.MapperService; | ||
| import org.elasticsearch.index.mapper.SeqNoFieldMapper; | ||
| import org.elasticsearch.index.mapper.Uid; | ||
| import org.elasticsearch.index.mapper.VersionFieldMapper; | ||
| import org.elasticsearch.index.translog.Translog; | ||
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|
||
| import java.io.Closeable; | ||
| import java.io.IOException; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
|
|
||
| /** | ||
| * A {@link Translog.Snapshot} from changes in a Lucene index | ||
| */ | ||
| final class LuceneChangesSnapshot implements Translog.Snapshot { | ||
| private final long fromSeqNo, toSeqNo; | ||
| private long lastSeenSeqNo; | ||
| private int skippedOperations; | ||
| private final boolean requiredFullRange; | ||
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| private final IndexSearcher indexSearcher; | ||
| private final MapperService mapperService; | ||
| private int docIndex = 0; | ||
| private final TopDocs topDocs; | ||
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| private final Closeable onClose; | ||
| private final CombinedDocValues[] docValues; // Cache of DocValues | ||
|
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| /** | ||
| * Creates a new "translog" snapshot from Lucene for reading operations whose seq# in the specified range. | ||
| * | ||
| * @param engineSearcher the internal engine searcher which will be taken over if the snapshot is opened successfully | ||
| * @param mapperService the mapper service which will be mainly used to resolve the document's type and uid | ||
| * @param fromSeqNo the min requesting seq# - inclusive | ||
| * @param toSeqNo the maximum requesting seq# - inclusive | ||
| * @param requiredFullRange if true, the snapshot will strictly check for the existence of operations between fromSeqNo and toSeqNo | ||
| */ | ||
| LuceneChangesSnapshot(Engine.Searcher engineSearcher, MapperService mapperService, | ||
| long fromSeqNo, long toSeqNo, boolean requiredFullRange) throws IOException { | ||
| if (fromSeqNo < 0 || toSeqNo < 0 || fromSeqNo > toSeqNo) { | ||
| throw new IllegalArgumentException("Invalid range; from_seqno [" + fromSeqNo + "], to_seqno [" + toSeqNo + "]"); | ||
| } | ||
| this.mapperService = mapperService; | ||
| this.fromSeqNo = fromSeqNo; | ||
| this.toSeqNo = toSeqNo; | ||
| this.lastSeenSeqNo = fromSeqNo - 1; | ||
| this.requiredFullRange = requiredFullRange; | ||
| this.indexSearcher = new IndexSearcher(Lucene.wrapAllDocsLive(engineSearcher.getDirectoryReader())); | ||
| this.indexSearcher.setQueryCache(null); | ||
| this.topDocs = searchOperations(indexSearcher); | ||
| final List<LeafReaderContext> leaves = indexSearcher.getIndexReader().leaves(); | ||
| this.docValues = new CombinedDocValues[leaves.size()]; | ||
| for (LeafReaderContext leaf : leaves) { | ||
| this.docValues[leaf.ord] = new CombinedDocValues(leaf.reader()); | ||
| } | ||
| this.onClose = engineSearcher; | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| onClose.close(); | ||
| } | ||
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| @Override | ||
| public int totalOperations() { | ||
| return Math.toIntExact(topDocs.totalHits); | ||
| } | ||
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| @Override | ||
| public int overriddenOperations() { | ||
| return skippedOperations; | ||
| } | ||
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| @Override | ||
| public Translog.Operation next() throws IOException { | ||
| Translog.Operation op = null; | ||
| for (int docId = nextDocId(); docId != DocIdSetIterator.NO_MORE_DOCS; docId = nextDocId()) { | ||
| op = readDocAsOp(docId); | ||
| if (op != null) { | ||
| break; | ||
| } | ||
| } | ||
| if (requiredFullRange) { | ||
| rangeCheck(op); | ||
| } | ||
| if (op != null) { | ||
| lastSeenSeqNo = op.seqNo(); | ||
| } | ||
| return op; | ||
| } | ||
|
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| private void rangeCheck(Translog.Operation op) { | ||
| if (op == null) { | ||
| if (lastSeenSeqNo < toSeqNo) { | ||
| throw new IllegalStateException("Not all operations between min_seqno [" + fromSeqNo + "] " + | ||
| "and max_seqno [" + toSeqNo + "] found; prematurely terminated last_seen_seqno [" + lastSeenSeqNo + "]"); | ||
| } | ||
| } else { | ||
| final long expectedSeqNo = lastSeenSeqNo + 1; | ||
| if (op.seqNo() != expectedSeqNo) { | ||
| throw new IllegalStateException("Not all operations between min_seqno [" + fromSeqNo + "] " + | ||
| "and max_seqno [" + toSeqNo + "] found; expected seqno [" + expectedSeqNo + "]; found [" + op + "]"); | ||
| } | ||
| } | ||
| } | ||
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| private int nextDocId() { | ||
| if (docIndex < topDocs.scoreDocs.length) { | ||
| final int docId = topDocs.scoreDocs[docIndex].doc; | ||
| docIndex++; | ||
| return docId; | ||
| } else { | ||
| return DocIdSetIterator.NO_MORE_DOCS; | ||
| } | ||
| } | ||
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| private TopDocs searchOperations(IndexSearcher searcher) throws IOException { | ||
| final Query rangeQuery = LongPoint.newRangeQuery(SeqNoFieldMapper.NAME, fromSeqNo, toSeqNo); | ||
| final Sort sortedBySeqNoThenByTerm = new Sort( | ||
| new SortedNumericSortField(SeqNoFieldMapper.NAME, SortField.Type.LONG), | ||
| new SortedNumericSortField(SeqNoFieldMapper.PRIMARY_TERM_NAME, SortField.Type.LONG, true) | ||
| ); | ||
| return searcher.search(rangeQuery, Integer.MAX_VALUE, sortedBySeqNoThenByTerm); | ||
| } | ||
|
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| private Translog.Operation readDocAsOp(int docID) throws IOException { | ||
| final List<LeafReaderContext> leaves = indexSearcher.getIndexReader().leaves(); | ||
| final LeafReaderContext leaf = leaves.get(ReaderUtil.subIndex(docID, leaves)); | ||
| final int segmentDocID = docID - leaf.docBase; | ||
| final long primaryTerm = docValues[leaf.ord].docPrimaryTerm(segmentDocID); | ||
| // We don't have to read the nested child documents - those docs don't have primary terms. | ||
| if (primaryTerm == -1) { | ||
| skippedOperations++; | ||
| return null; | ||
| } | ||
| final long seqNo = docValues[leaf.ord].docSeqNo(segmentDocID); | ||
| // Only pick the first seen seq# | ||
| if (seqNo == lastSeenSeqNo) { | ||
| skippedOperations++; | ||
| return null; | ||
| } | ||
| final long version = docValues[leaf.ord].docVersion(segmentDocID); | ||
| final FieldsVisitor fields = new FieldsVisitor(true); | ||
| indexSearcher.doc(docID, fields); | ||
| fields.postProcess(mapperService); | ||
|
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| final Translog.Operation op; | ||
| final boolean isTombstone = docValues[leaf.ord].isTombstone(segmentDocID); | ||
| if (isTombstone && fields.uid() == null) { | ||
| op = new Translog.NoOp(seqNo, primaryTerm, ""); // TODO: store reason in ignored fields? | ||
| assert version == 1L : "Noop tombstone should have version 1L; actual version [" + version + "]"; | ||
| assert assertDocSoftDeleted(leaf.reader(), segmentDocID) : "Noop but soft_deletes field is not set [" + op + "]"; | ||
| } else { | ||
| final String id = fields.uid().id(); | ||
| final String type = fields.uid().type(); | ||
| final Term uid = new Term(IdFieldMapper.NAME, Uid.encodeId(id)); | ||
| if (isTombstone) { | ||
| op = new Translog.Delete(type, id, uid, seqNo, primaryTerm, version, VersionType.INTERNAL); | ||
| assert assertDocSoftDeleted(leaf.reader(), segmentDocID) : "Delete op but soft_deletes field is not set [" + op + "]"; | ||
| } else { | ||
| final BytesReference source = fields.source(); | ||
| // TODO: pass the latest timestamp from engine. | ||
| final long autoGeneratedIdTimestamp = -1; | ||
| op = new Translog.Index(type, id, seqNo, primaryTerm, version, VersionType.INTERNAL, | ||
| source.toBytesRef().bytes, fields.routing(), autoGeneratedIdTimestamp); | ||
| } | ||
| } | ||
| assert fromSeqNo <= op.seqNo() && op.seqNo() <= toSeqNo && lastSeenSeqNo < op.seqNo() : "Unexpected operation; " + | ||
| "last_seen_seqno [" + lastSeenSeqNo + "], from_seqno [" + fromSeqNo + "], to_seqno [" + toSeqNo + "], op [" + op + "]"; | ||
| return op; | ||
| } | ||
|
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| private boolean assertDocSoftDeleted(LeafReader leafReader, int segmentDocId) throws IOException { | ||
| final NumericDocValues ndv = leafReader.getNumericDocValues(Lucene.SOFT_DELETE_FIELD); | ||
| if (ndv == null || ndv.advanceExact(segmentDocId) == false) { | ||
| throw new IllegalStateException("DocValues for field [" + Lucene.SOFT_DELETE_FIELD + "] is not found"); | ||
| } | ||
| return ndv.longValue() == 1; | ||
| } | ||
|
|
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| private static final class CombinedDocValues { | ||
| private final LeafReader leafReader; | ||
| private NumericDocValues versionDV; | ||
| private NumericDocValues seqNoDV; | ||
| private NumericDocValues primaryTermDV; | ||
| private NumericDocValues tombstoneDV; | ||
|
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| CombinedDocValues(LeafReader leafReader) throws IOException { | ||
| this.leafReader = leafReader; | ||
| this.versionDV = Objects.requireNonNull(leafReader.getNumericDocValues(VersionFieldMapper.NAME), "VersionDV is missing"); | ||
| this.seqNoDV = Objects.requireNonNull(leafReader.getNumericDocValues(SeqNoFieldMapper.NAME), "SeqNoDV is missing"); | ||
| this.primaryTermDV = Objects.requireNonNull( | ||
| leafReader.getNumericDocValues(SeqNoFieldMapper.PRIMARY_TERM_NAME), "PrimaryTermDV is missing"); | ||
| this.tombstoneDV = leafReader.getNumericDocValues(SeqNoFieldMapper.TOMBSTONE_NAME); | ||
| } | ||
|
|
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| long docVersion(int segmentDocId) throws IOException { | ||
| if (versionDV.docID() > segmentDocId) { | ||
| versionDV = Objects.requireNonNull(leafReader.getNumericDocValues(VersionFieldMapper.NAME), "VersionDV is missing"); | ||
| } | ||
| if (versionDV.advanceExact(segmentDocId) == false) { | ||
| throw new IllegalStateException("DocValues for field [" + VersionFieldMapper.NAME + "] is not found"); | ||
| } | ||
| return versionDV.longValue(); | ||
| } | ||
|
|
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| long docSeqNo(int segmentDocId) throws IOException { | ||
| if (seqNoDV.docID() > segmentDocId) { | ||
| seqNoDV = Objects.requireNonNull(leafReader.getNumericDocValues(SeqNoFieldMapper.NAME), "SeqNoDV is missing"); | ||
| } | ||
| if (seqNoDV.advanceExact(segmentDocId) == false) { | ||
| throw new IllegalStateException("DocValues for field [" + SeqNoFieldMapper.NAME + "] is not found"); | ||
| } | ||
| return seqNoDV.longValue(); | ||
| } | ||
|
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| long docPrimaryTerm(int segmentDocId) throws IOException { | ||
| if (primaryTermDV == null) { | ||
| return -1L; | ||
| } | ||
| if (primaryTermDV.docID() > segmentDocId) { | ||
| primaryTermDV = leafReader.getNumericDocValues(SeqNoFieldMapper.PRIMARY_TERM_NAME); | ||
| } | ||
| // Use -1 for docs which don't have primary term. The caller considers those docs as nested docs. | ||
| if (primaryTermDV.advanceExact(segmentDocId) == false) { | ||
| return -1; | ||
| } | ||
| return primaryTermDV.longValue(); | ||
| } | ||
|
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| boolean isTombstone(int segmentDocId) throws IOException { | ||
| if (tombstoneDV == null) { | ||
| return false; | ||
| } | ||
| if (tombstoneDV.docID() > segmentDocId) { | ||
| tombstoneDV = leafReader.getNumericDocValues(SeqNoFieldMapper.TOMBSTONE_NAME); | ||
| } | ||
| return tombstoneDV.advanceExact(segmentDocId) && tombstoneDV.longValue() > 0; | ||
| } | ||
| } | ||
| } |
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