cbalci commented on a change in pull request #6346: URL: https://github.com/apache/incubator-pinot/pull/6346#discussion_r543770437
########## File path: pinot-core/src/main/java/org/apache/pinot/core/data/manager/offline/DimensionTableDataManager.java ########## @@ -0,0 +1,160 @@ +/** + * 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.pinot.core.data.manager.offline; + +import com.google.common.base.Preconditions; +import java.io.File; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReadWriteLock; +import java.util.concurrent.locks.ReentrantReadWriteLock; +import javax.annotation.concurrent.GuardedBy; +import javax.annotation.concurrent.ThreadSafe; +import org.apache.commons.collections.CollectionUtils; +import org.apache.pinot.common.metadata.ZKMetadataProvider; +import org.apache.pinot.core.data.manager.SegmentDataManager; +import org.apache.pinot.core.data.readers.MultiplePinotSegmentRecordReader; +import org.apache.pinot.core.indexsegment.IndexSegment; +import org.apache.pinot.core.segment.index.loader.IndexLoadingConfig; +import org.apache.pinot.spi.data.FieldSpec; +import org.apache.pinot.spi.data.Schema; +import org.apache.pinot.spi.data.readers.GenericRow; +import org.apache.pinot.spi.data.readers.PrimaryKey; + +/** + * Dimension Table is a special type of OFFLINE table which is assigned to all servers + * in a tenant and is used to execute a LOOKUP Transform Function. DimensionTableDataManager + * loads the contents into a HashMap for faster access thus the size should be small + * enough to easily fit in memory. + * + * DimensionTableDataManager uses Registry of Singletons pattern to store one instance per table + * which can be accessed via `getInstanceByTableName` static method. + */ +@ThreadSafe +public class DimensionTableDataManager extends OfflineTableDataManager { + // Storing singletons per table in a HashMap + private static final Map<String, DimensionTableDataManager> _instances = new ConcurrentHashMap<>(); + + private DimensionTableDataManager() {} + + public static DimensionTableDataManager createInstanceByTableName(String tableName) { + _instances.putIfAbsent(tableName, new DimensionTableDataManager()); + return _instances.get(tableName); + } + + public static DimensionTableDataManager getInstanceByTableName(String tableName) { + return _instances.get(tableName); + } + + /* + * DimensionTableDataManager Instance Properties/Methods + */ + + private final ReadWriteLock _rwl = new ReentrantReadWriteLock(); + private final Lock _lookupTableReadLock = _rwl.readLock(); + private final Lock _lookupTableWriteLock = _rwl.writeLock(); + + // _lookupTable is a HashMap used for storing/serving records for a table keyed by table PK + @GuardedBy("_rwl") + private final Map<PrimaryKey, GenericRow> _lookupTable = new HashMap<>(); + private Schema _tableSchema; + private List<String> _primaryKeyColumns; + + @Override + protected void doInit() { + super.doInit(); + + _tableSchema = ZKMetadataProvider.getTableSchema(_propertyStore, _tableNameWithType); + Preconditions.checkState(_tableSchema != null, "Failed to find schema for table: %s", _tableNameWithType); + _primaryKeyColumns = _tableSchema.getPrimaryKeyColumns(); + Preconditions.checkState(!CollectionUtils.isEmpty(_primaryKeyColumns), + "Primary key columns must be configured for dimension table: %s", _tableNameWithType); + } + + @Override + public void addSegment(File indexDir, IndexLoadingConfig indexLoadingConfig) + throws Exception { + super.addSegment(indexDir, indexLoadingConfig); + try { + loadLookupTable(); + _logger.info("Successfully loaded lookup table for {}", getTableName()); Review comment: Done ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For additional commands, e-mail: commits-h...@pinot.apache.org
