cbalci commented on a change in pull request #6346: URL: https://github.com/apache/incubator-pinot/pull/6346#discussion_r543770718
########## 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()); + } catch (Exception e) { + throw new RuntimeException( + String.format("Error loading lookup table: %s", getTableName()),e); + } + } + + @Override + public void removeSegment(String segmentName) { + super.removeSegment(segmentName); + try { + loadLookupTable(); + _logger.info("Successfully removed segment and reloaded lookup table for {}", getTableName()); + } catch (Exception e) { + _logger.error("Error reloading lookup table after segment remove for table {}", getTableName()); Review comment: Done ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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