| /* |
| * 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.drill.exec.store.hive.client; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| |
| import org.apache.calcite.schema.Schema.TableType; |
| import org.apache.drill.common.AutoCloseables; |
| import com.google.common.cache.CacheLoader; |
| import org.apache.hadoop.hive.metastore.api.MetaException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static org.apache.hadoop.hive.metastore.TableType.VIRTUAL_VIEW; |
| |
| /** |
| * CacheLoader that synchronized on client and tries to reconnect when |
| * client fails. Used by {@link HiveMetadataCache}. |
| */ |
| final class TableNameCacheLoader extends CacheLoader<String, Map<String, TableType>> { |
| |
| private static final Logger logger = LoggerFactory.getLogger(TableNameCacheLoader.class); |
| |
| private final DrillHiveMetaStoreClient client; |
| |
| TableNameCacheLoader(DrillHiveMetaStoreClient client) { |
| this.client = client; |
| } |
| |
| @Override |
| @SuppressWarnings("NullableProblems") |
| public Map<String, TableType> load(String dbName) throws Exception { |
| List<String> tableAndViewNames; |
| final Set<String> viewNames = new HashSet<>(); |
| synchronized (client) { |
| try { |
| tableAndViewNames = client.getAllTables(dbName); |
| viewNames.addAll(client.getTables(dbName, "*", VIRTUAL_VIEW)); |
| } catch (MetaException e) { |
| /* |
| HiveMetaStoreClient is encapsulating both the MetaException/TExceptions inside MetaException. |
| Since we don't have good way to differentiate, we will close older connection and retry once. |
| This is only applicable for getAllTables and getAllDatabases method since other methods are |
| properly throwing correct exceptions. |
| */ |
| logger.warn("Failure while attempting to get hive tables. Retries once.", e); |
| AutoCloseables.closeSilently(client::close); |
| client.reconnect(); |
| tableAndViewNames = client.getAllTables(dbName); |
| viewNames.addAll(client.getTables(dbName, "*", VIRTUAL_VIEW)); |
| } |
| } |
| Map<String, TableType> result = tableAndViewNames.stream() |
| .collect(Collectors.toMap(Function.identity(), getValueMapper(viewNames))); |
| return Collections.unmodifiableMap(result); |
| } |
| |
| /** |
| * Creates function used to map table or view name to appropriate |
| * {@link TableType} value based on set of view names. |
| * |
| * @param viewNames set of view names |
| * @return mapping function |
| */ |
| private Function<String, TableType> getValueMapper(Set<String> viewNames) { |
| if (viewNames.isEmpty()) { |
| return tableName -> TableType.TABLE; |
| } else { |
| return tableName -> viewNames.contains(tableName) ? TableType.VIEW : TableType.TABLE; |
| } |
| } |
| |
| } |