[Remove] types from Uid and remaining types/Uid from translog (#2450)

Removes types from UID class along with cleaning up all obsolete MapperService
dependendices. This includes removing UID from the Translog Delete operation
which is no longer needed due to type dependency removal.

Signed-off-by: Nicholas Walter Knize <nknize@apache.org>

Author: nknize

server/src/main/java/org/opensearch/index/engine/Engine.java

@@ -72,7 +72,6 @@
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.ReleasableLock;
 import org.opensearch.index.VersionType;
-import org.opensearch.index.mapper.MapperService;
 import org.opensearch.index.mapper.Mapping;
 import org.opensearch.index.mapper.ParseContext.Document;
 import org.opensearch.index.mapper.ParsedDocument;
@@ -736,13 +735,8 @@ public enum SearcherScope {
      * Creates a new history snapshot from Lucene for reading operations whose seqno in the requesting seqno range (both inclusive).
      * This feature requires soft-deletes enabled. If soft-deletes are disabled, this method will throw an {@link IllegalStateException}.
      */
-    public abstract Translog.Snapshot newChangesSnapshot(
-        String source,
-        MapperService mapperService,
-        long fromSeqNo,
-        long toSeqNo,
-        boolean requiredFullRange
-    ) throws IOException;
+    public abstract Translog.Snapshot newChangesSnapshot(String source, long fromSeqNo, long toSeqNo, boolean requiredFullRange)
+        throws IOException;
 
     public abstract boolean hasCompleteOperationHistory(String reason, long startingSeqNo);
 

server/src/main/java/org/opensearch/index/engine/InternalEngine.java

@@ -91,7 +91,6 @@
 import org.opensearch.index.VersionType;
 import org.opensearch.index.fieldvisitor.IdOnlyFieldVisitor;
 import org.opensearch.index.mapper.IdFieldMapper;
-import org.opensearch.index.mapper.MapperService;
 import org.opensearch.index.mapper.ParseContext;
 import org.opensearch.index.mapper.ParsedDocument;
 import org.opensearch.index.mapper.SeqNoFieldMapper;
@@ -2773,20 +2772,13 @@ long getNumDocUpdates() {
     }
 
     @Override
-    public Translog.Snapshot newChangesSnapshot(
-        String source,
-        MapperService mapperService,
-        long fromSeqNo,
-        long toSeqNo,
-        boolean requiredFullRange
-    ) throws IOException {
+    public Translog.Snapshot newChangesSnapshot(String source, long fromSeqNo, long toSeqNo, boolean requiredFullRange) throws IOException {
         ensureOpen();
         refreshIfNeeded(source, toSeqNo);
         Searcher searcher = acquireSearcher(source, SearcherScope.INTERNAL);
         try {
             LuceneChangesSnapshot snapshot = new LuceneChangesSnapshot(
                 searcher,
-                mapperService,
                 LuceneChangesSnapshot.DEFAULT_BATCH_SIZE,
                 fromSeqNo,
                 toSeqNo,

server/src/main/java/org/opensearch/index/engine/LuceneChangesSnapshot.java

@@ -36,7 +36,6 @@
 import org.apache.lucene.index.LeafReader;
 import org.apache.lucene.index.LeafReaderContext;
 import org.apache.lucene.index.NumericDocValues;
-import org.apache.lucene.index.Term;
 import org.apache.lucene.search.BooleanClause;
 import org.apache.lucene.search.BooleanQuery;
 import org.apache.lucene.search.DocValuesFieldExistsQuery;
@@ -51,11 +50,8 @@
 import org.opensearch.common.lucene.Lucene;
 import org.opensearch.core.internal.io.IOUtils;
 import org.opensearch.index.fieldvisitor.FieldsVisitor;
-import org.opensearch.index.mapper.IdFieldMapper;
-import org.opensearch.index.mapper.MapperService;
 import org.opensearch.index.mapper.SeqNoFieldMapper;
 import org.opensearch.index.mapper.SourceFieldMapper;
-import org.opensearch.index.mapper.Uid;
 import org.opensearch.index.translog.Translog;
 
 import java.io.Closeable;
@@ -77,7 +73,6 @@ final class LuceneChangesSnapshot implements Translog.Snapshot {
     private final boolean requiredFullRange;
 
     private final IndexSearcher indexSearcher;
-    private final MapperService mapperService;
     private int docIndex = 0;
     private final int totalHits;
     private ScoreDoc[] scoreDocs;
@@ -88,20 +83,13 @@ final class LuceneChangesSnapshot implements Translog.Snapshot {
      * 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 searchBatchSize   the number of documents should be returned by each search
      * @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,
-        int searchBatchSize,
-        long fromSeqNo,
-        long toSeqNo,
-        boolean requiredFullRange
-    ) throws IOException {
+    LuceneChangesSnapshot(Engine.Searcher engineSearcher, int searchBatchSize, 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 + "]");
         }
@@ -114,7 +102,6 @@ final class LuceneChangesSnapshot implements Translog.Snapshot {
                 IOUtils.close(engineSearcher);
             }
         };
-        this.mapperService = mapperService;
         final long requestingSize = (toSeqNo - fromSeqNo) == Long.MAX_VALUE ? Long.MAX_VALUE : (toSeqNo - fromSeqNo + 1L);
         this.searchBatchSize = requestingSize < searchBatchSize ? Math.toIntExact(requestingSize) : searchBatchSize;
         this.fromSeqNo = fromSeqNo;
@@ -278,19 +265,17 @@ private Translog.Operation readDocAsOp(int docIndex) throws IOException {
             : SourceFieldMapper.NAME;
         final FieldsVisitor fields = new FieldsVisitor(true, sourceField);
         leaf.reader().document(segmentDocID, fields);
-        fields.postProcess(mapperService);
 
         final Translog.Operation op;
         final boolean isTombstone = parallelArray.isTombStone[docIndex];
-        if (isTombstone && fields.uid() == null) {
+        if (isTombstone && fields.id() == null) {
             op = new Translog.NoOp(seqNo, primaryTerm, fields.source().utf8ToString());
             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 Term uid = new Term(IdFieldMapper.NAME, Uid.encodeId(id));
+            final String id = fields.id();
             if (isTombstone) {
-                op = new Translog.Delete(id, uid, seqNo, primaryTerm, version);
+                op = new Translog.Delete(id, seqNo, primaryTerm, version);
                 assert assertDocSoftDeleted(leaf.reader(), segmentDocID) : "Delete op but soft_deletes field is not set [" + op + "]";
             } else {
                 final BytesReference source = fields.source();

server/src/main/java/org/opensearch/index/engine/ReadOnlyEngine.java

@@ -46,7 +46,6 @@
 import org.opensearch.common.lucene.index.OpenSearchDirectoryReader;
 import org.opensearch.common.util.concurrent.ReleasableLock;
 import org.opensearch.core.internal.io.IOUtils;
-import org.opensearch.index.mapper.MapperService;
 import org.opensearch.index.seqno.SeqNoStats;
 import org.opensearch.index.seqno.SequenceNumbers;
 import org.opensearch.index.store.Store;
@@ -326,13 +325,7 @@ public Closeable acquireHistoryRetentionLock() {
     }
 
     @Override
-    public Translog.Snapshot newChangesSnapshot(
-        String source,
-        MapperService mapperService,
-        long fromSeqNo,
-        long toSeqNo,
-        boolean requiredFullRange
-    ) {
+    public Translog.Snapshot newChangesSnapshot(String source, long fromSeqNo, long toSeqNo, boolean requiredFullRange) {
         return newEmptySnapshot();
     }
 

server/src/main/java/org/opensearch/index/fieldvisitor/FieldsVisitor.java

@@ -36,7 +36,6 @@
 import org.apache.lucene.util.BytesRef;
 import org.opensearch.common.bytes.BytesArray;
 import org.opensearch.common.bytes.BytesReference;
-import org.opensearch.index.mapper.DocumentMapper;
 import org.opensearch.index.mapper.IdFieldMapper;
 import org.opensearch.index.mapper.IgnoredFieldMapper;
 import org.opensearch.index.mapper.MappedFieldType;
@@ -67,7 +66,7 @@ public class FieldsVisitor extends StoredFieldVisitor {
     private final String sourceFieldName;
     private final Set<String> requiredFields;
     protected BytesReference source;
-    protected String type, id;
+    protected String id;
     protected Map<String, List<Object>> fieldsValues;
 
     public FieldsVisitor(boolean loadSource) {
@@ -98,10 +97,6 @@ public Status needsField(FieldInfo fieldInfo) {
     }
 
     public void postProcess(MapperService mapperService) {
-        final DocumentMapper mapper = mapperService.documentMapper();
-        if (mapper != null) {
-            type = mapper.type();
-        }
         for (Map.Entry<String, List<Object>> entry : fields().entrySet()) {
             MappedFieldType fieldType = mapperService.fieldType(entry.getKey());
             if (fieldType == null) {
@@ -167,13 +162,8 @@ public BytesReference source() {
         return source;
     }
 
-    public Uid uid() {
-        if (id == null) {
-            return null;
-        } else if (type == null) {
-            throw new IllegalStateException("Call postProcess before getting the uid");
-        }
-        return new Uid(type, id);
+    public String id() {
+        return id;
     }
 
     public String routing() {
@@ -195,7 +185,6 @@ public Map<String, List<Object>> fields() {
     public void reset() {
         if (fieldsValues != null) fieldsValues.clear();
         source = null;
-        type = null;
         id = null;
 
         requiredFields.addAll(BASE_REQUIRED_FIELDS);

server/src/main/java/org/opensearch/index/mapper/Uid.java

@@ -43,52 +43,13 @@ public final class Uid {
     public static final char DELIMITER = '#';
     public static final byte DELIMITER_BYTE = 0x23;
 
-    private final String type;
-
-    private final String id;
-
-    public Uid(String type, String id) {
-        this.type = type;
-        this.id = id;
-    }
-
-    public String type() {
-        return type;
-    }
-
-    public String id() {
-        return id;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-
-        Uid uid = (Uid) o;
-
-        if (id != null ? !id.equals(uid.id) : uid.id != null) return false;
-        if (type != null ? !type.equals(uid.type) : uid.type != null) return false;
-
-        return true;
-    }
-
-    @Override
-    public int hashCode() {
-        int result = type != null ? type.hashCode() : 0;
-        result = 31 * result + (id != null ? id.hashCode() : 0);
-        return result;
-    }
-
-    @Override
-    public String toString() {
-        return type + "#" + id;
-    }
-
     private static final int UTF8 = 0xff;
     private static final int NUMERIC = 0xfe;
     private static final int BASE64_ESCAPE = 0xfd;
 
+    // non-instantiable
+    private Uid() {}
+
     static boolean isURLBase64WithoutPadding(String id) {
         // We are not lenient about padding chars ('=') otherwise
         // 'xxx=' and 'xxx' could be considered the same id

server/src/main/java/org/opensearch/index/shard/IndexShard.java

@@ -1069,14 +1069,12 @@ private Engine.DeleteResult applyDeleteOperation(
             + getOperationPrimaryTerm()
             + "]";
         ensureWriteAllowed(origin);
-        final Term uid = new Term(IdFieldMapper.NAME, Uid.encodeId(id));
-        final Engine.Delete delete = prepareDelete(id, uid, seqNo, opPrimaryTerm, version, versionType, origin, ifSeqNo, ifPrimaryTerm);
+        final Engine.Delete delete = prepareDelete(id, seqNo, opPrimaryTerm, version, versionType, origin, ifSeqNo, ifPrimaryTerm);
         return delete(engine, delete);
     }
 
-    private Engine.Delete prepareDelete(
+    public static Engine.Delete prepareDelete(
         String id,
-        Term uid,
         long seqNo,
         long primaryTerm,
         long version,
@@ -1086,6 +1084,7 @@ private Engine.Delete prepareDelete(
         long ifPrimaryTerm
     ) {
         long startTime = System.nanoTime();
+        final Term uid = new Term(IdFieldMapper.NAME, Uid.encodeId(id));
         return new Engine.Delete(id, uid, seqNo, primaryTerm, version, versionType, origin, startTime, ifSeqNo, ifPrimaryTerm);
     }
 
@@ -2238,7 +2237,7 @@ public Closeable acquireHistoryRetentionLock() {
      * The returned snapshot can be retrieved from either Lucene index or translog files.
      */
     public Translog.Snapshot getHistoryOperations(String reason, long startingSeqNo, long endSeqNo) throws IOException {
-        return getEngine().newChangesSnapshot(reason, mapperService, startingSeqNo, endSeqNo, true);
+        return getEngine().newChangesSnapshot(reason, startingSeqNo, endSeqNo, true);
     }
 
     /**
@@ -2270,7 +2269,7 @@ public long getMinRetainedSeqNo() {
      *                          This parameter should be only enabled when the entire requesting range is below the global checkpoint.
      */
     public Translog.Snapshot newChangesSnapshot(String source, long fromSeqNo, long toSeqNo, boolean requiredFullRange) throws IOException {
-        return getEngine().newChangesSnapshot(source, mapperService, fromSeqNo, toSeqNo, requiredFullRange);
+        return getEngine().newChangesSnapshot(source, fromSeqNo, toSeqNo, requiredFullRange);
     }
 
     public List<Segment> segments(boolean verbose) {