maedhroz commented on code in PR #2498: URL: https://github.com/apache/cassandra/pull/2498#discussion_r1270144665
########## src/java/org/apache/cassandra/index/sai/disk/v1/WideRowAwarePrimaryKeyMap.java: ########## @@ -0,0 +1,162 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF 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.apache.cassandra.index.sai.disk.v1; + +import java.io.IOException; +import java.nio.ByteBuffer; + +import javax.annotation.concurrent.NotThreadSafe; +import javax.annotation.concurrent.ThreadSafe; + +import org.apache.cassandra.db.BufferDecoratedKey; +import org.apache.cassandra.db.Clustering; +import org.apache.cassandra.db.ClusteringComparator; +import org.apache.cassandra.db.DecoratedKey; +import org.apache.cassandra.db.marshal.ByteBufferAccessor; +import org.apache.cassandra.dht.IPartitioner; +import org.apache.cassandra.index.sai.disk.PrimaryKeyMap; +import org.apache.cassandra.index.sai.disk.format.IndexComponent; +import org.apache.cassandra.index.sai.disk.format.IndexDescriptor; +import org.apache.cassandra.index.sai.disk.v1.sortedterms.SortedTermsReader; +import org.apache.cassandra.index.sai.disk.v1.sortedterms.SortedTermsTrieSearcher; +import org.apache.cassandra.index.sai.utils.PrimaryKey; +import org.apache.cassandra.io.sstable.format.SSTableReader; +import org.apache.cassandra.io.util.FileHandle; +import org.apache.cassandra.io.util.FileUtils; +import org.apache.cassandra.utils.Throwables; +import org.apache.cassandra.utils.bytecomparable.ByteComparable; +import org.apache.cassandra.utils.bytecomparable.ByteSource; +import org.apache.cassandra.utils.bytecomparable.ByteSourceInverse; + +/** + * An extension of the {@link SkinnyRowAwarePrimaryKeyMap} for wide tables (those with clustering columns). + * <p> + * In addition to the on-disk structures used by the {@link SkinnyRowAwarePrimaryKeyMap} this uses: + * <ul> + * <li>A primary key trie {@link SortedTermsTrieSearcher} for performing primary key -> rowId lookups. Uses the + * {@link IndexComponent#PRIMARY_KEY_TRIE} component. + * </ul> + * + * While the {@link WideRowAwarePrimaryKeyMapFactory} is threadsafe, individual instances of the {@link WideRowAwarePrimaryKeyMap} + * are not. + */ +@NotThreadSafe +public class WideRowAwarePrimaryKeyMap extends SkinnyRowAwarePrimaryKeyMap +{ + @ThreadSafe + public static class WideRowAwarePrimaryKeyMapFactory extends SkinnyRowAwarePrimaryKeyMapFactory + { + private FileHandle primaryKeyTrieFile = null; + private final ClusteringComparator clusteringComparator; + + public WideRowAwarePrimaryKeyMapFactory(IndexDescriptor indexDescriptor, SSTableReader sstable) + { + super(indexDescriptor, sstable); + + try + { + this.primaryKeyTrieFile = indexDescriptor.createPerSSTableFileHandle(IndexComponent.PRIMARY_KEY_TRIE); + this.clusteringComparator = indexDescriptor.clusteringComparator; + } + catch (Throwable t) + { + throw Throwables.unchecked(Throwables.close(t, primaryKeyTrieFile)); + } + } + + @Override + @SuppressWarnings({ "resource", "RedundantSuppression" }) + public PrimaryKeyMap newPerSSTablePrimaryKeyMap() throws IOException + { + LongArray rowIdToToken = new LongArray.DeferredLongArray(tokenReaderFactory::open); + return new WideRowAwarePrimaryKeyMap(rowIdToToken, + new SortedTermsTrieSearcher(primaryKeyTrieFile.instantiateRebufferer(null), sortedTermsMeta), + sortedTermsReader.openCursor(), + partitioner, + primaryKeyFactory, + clusteringComparator); + } + } + + private final SortedTermsTrieSearcher trieSearcher; + private final ClusteringComparator clusteringComparator; + + private WideRowAwarePrimaryKeyMap(LongArray tokenArray, + SortedTermsTrieSearcher trieSearcher, + SortedTermsReader.Cursor cursor, + IPartitioner partitioner, + PrimaryKey.Factory primaryKeyFactory, + ClusteringComparator clusteringComparator) + { + super(tokenArray, cursor, partitioner, primaryKeyFactory); + + this.trieSearcher = trieSearcher; + this.clusteringComparator = clusteringComparator; + } + + @Override + public long rowIdFromPrimaryKey(PrimaryKey key) + { + long rowId = tokenArray.findTokenRowID(key.token().getLongValue()); + // If the key only has a token (initial range skip in the query) or the token is out of range + // the return the rowId from the token array. + if (key.isTokenOnly() || rowId == -1) Review Comment: nit: `rowId < 0`, given the way we documented `findTokenRowID()`? -- This is an automated message from the Apache Git Service. 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