-
Notifications
You must be signed in to change notification settings - Fork 24.9k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
[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
- Loading branch information
Showing
12 changed files
with
833 additions
and
183 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
280 changes: 280 additions & 0 deletions
280
server/src/main/java/org/elasticsearch/index/engine/LuceneChangesSnapshot.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,280 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
||
| package org.elasticsearch.index.engine; | ||
|
|
||
| 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; | ||
|
|
||
| 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; | ||
|
|
||
| private final IndexSearcher indexSearcher; | ||
| private final MapperService mapperService; | ||
| private int docIndex = 0; | ||
| private final TopDocs topDocs; | ||
|
|
||
| private final Closeable onClose; | ||
| private final CombinedDocValues[] docValues; // Cache of DocValues | ||
|
|
||
| /** | ||
| * 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; | ||
| } | ||
|
|
||
| @Override | ||
| public void close() throws IOException { | ||
| onClose.close(); | ||
| } | ||
|
|
||
| @Override | ||
| public int totalOperations() { | ||
| return Math.toIntExact(topDocs.totalHits); | ||
| } | ||
|
|
||
| @Override | ||
| public int overriddenOperations() { | ||
| return skippedOperations; | ||
| } | ||
|
|
||
| @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; | ||
| } | ||
|
|
||
| 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 + "]"); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private int nextDocId() { | ||
| if (docIndex < topDocs.scoreDocs.length) { | ||
| final int docId = topDocs.scoreDocs[docIndex].doc; | ||
| docIndex++; | ||
| return docId; | ||
| } else { | ||
| return DocIdSetIterator.NO_MORE_DOCS; | ||
| } | ||
| } | ||
|
|
||
| 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); | ||
| } | ||
|
|
||
| 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); | ||
|
|
||
| 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; | ||
| } | ||
|
|
||
| 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; | ||
| } | ||
|
|
||
| private static final class CombinedDocValues { | ||
| private final LeafReader leafReader; | ||
| private NumericDocValues versionDV; | ||
| private NumericDocValues seqNoDV; | ||
| private NumericDocValues primaryTermDV; | ||
| private NumericDocValues tombstoneDV; | ||
|
|
||
| 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); | ||
| } | ||
|
|
||
| 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(); | ||
| } | ||
|
|
||
| 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(); | ||
| } | ||
|
|
||
| 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(); | ||
| } | ||
|
|
||
| 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; | ||
| } | ||
| } | ||
| } |
Oops, something went wrong.