| /* |
| * 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.List; |
| import java.util.Map; |
| |
| import org.apache.calcite.schema.Schema.TableType; |
| import org.apache.drill.exec.store.hive.HiveReadEntry; |
| import org.apache.hadoop.hive.conf.HiveConf; |
| import org.apache.hadoop.hive.metastore.HiveMetaStoreClient; |
| import org.apache.hadoop.hive.metastore.api.MetaException; |
| import org.apache.thrift.TException; |
| |
| /** |
| * Extension of HiveMetaStoreClient with addition of cache and methods useful |
| * for Drill schema. Note, that access to parent class is synchronized either |
| * on cache loading level or in overridden methods, and the synchronization |
| * should not be neglected in child classes. |
| */ |
| public class DrillHiveMetaStoreClient extends HiveMetaStoreClient { |
| |
| /** |
| * Unified API for work with HiveMetaStoreClient |
| * client through local caches. |
| */ |
| private final HiveMetadataCache hiveMetadataCache; |
| |
| /** |
| * Package visibility performs two roles here: |
| * 1) ensure that child classes in same package; |
| * 2) ensure that instances published to other packages |
| * by {@link DrillHiveMetaStoreClientFactory}. |
| * |
| * @param hiveConf hive conf from storage plugin |
| * @throws MetaException when initialization failed |
| */ |
| DrillHiveMetaStoreClient(final HiveConf hiveConf) throws MetaException { |
| super(hiveConf); |
| hiveMetadataCache = new HiveMetadataCache(this, hiveConf); |
| } |
| |
| /** |
| * Lists all Hive database names. |
| * |
| * @param ignoreAuthzErrors whether authorization errors should be ignored |
| * @return list of Hive databases |
| * @throws TException when client fails |
| */ |
| public List<String> getDatabases(boolean ignoreAuthzErrors) throws TException { |
| return hiveMetadataCache.getDbNames(); |
| } |
| |
| /** |
| * Returns table metadata for concrete table |
| * |
| * @param dbName name of database |
| * @param tableName name of table |
| * @return {@link HiveReadEntry} containing table meta like columns, partitions etc. |
| * @throws TException when client fails |
| */ |
| public HiveReadEntry getHiveReadEntry(final String dbName, final String tableName, boolean ignoreAuthzErrors) throws TException { |
| return hiveMetadataCache.getHiveReadEntry(dbName, tableName); |
| } |
| |
| /** |
| * Returns collection of view and table names along with their types. |
| * |
| * @param dbName name of database |
| * @param ignoreAuthzErrors hint for handling authorization errors |
| * @return map where keys are db object names values are types (VIEW or TABLE) |
| * @throws TException in case when if loader thrown ExecutionException |
| */ |
| public Map<String, TableType> getTableNamesAndTypes(final String dbName, boolean ignoreAuthzErrors) throws TException { |
| return hiveMetadataCache.getTableNamesAndTypes(dbName); |
| } |
| |
| /** |
| * Overridden to enforce synchronization. |
| * |
| * @param owner the intended owner for the token |
| * @param renewerKerberosPrincipalName kerberos user |
| * @return the string of the token |
| * @throws TException when client fails |
| */ |
| @Override |
| public synchronized String getDelegationToken(String owner, String renewerKerberosPrincipalName) throws TException { |
| return super.getDelegationToken(owner, renewerKerberosPrincipalName); |
| } |
| |
| } |