[GitHub] [flink] bowenli86 commented on a change in pull request #8205: [FLINK-12238] [TABLE/SQL] Support database related operations in GenericHiveMetastoreCatalog and setup flink-connector-hive module

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bowenli86 commented on a change in pull request #8205: [FLINK-12238] [TABLE/SQL] Support database related operations in GenericHiveMetastoreCatalog and setup flink-connector-hive module
URL: https://github.com/apache/flink/pull/8205#discussion_r276899612
 
 

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 File path: flink-connectors/flink-connector-hive/src/main/java/org/apache/flink/table/catalog/hive/GenericHiveMetastoreCatalog.java
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+/*
+ * 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.flink.table.catalog.hive;
+
+import org.apache.flink.table.catalog.CatalogBaseTable;
+import org.apache.flink.table.catalog.CatalogDatabase;
+import org.apache.flink.table.catalog.GenericCatalogDatabase;
+import org.apache.flink.table.catalog.ObjectPath;
+import org.apache.flink.table.catalog.ReadableWritableCatalog;
+import org.apache.flink.table.catalog.exceptions.CatalogException;
+import org.apache.flink.table.catalog.exceptions.DatabaseAlreadyExistException;
+import org.apache.flink.table.catalog.exceptions.DatabaseNotEmptyException;
+import org.apache.flink.table.catalog.exceptions.DatabaseNotExistException;
+import org.apache.flink.table.catalog.exceptions.TableAlreadyExistException;
+import org.apache.flink.table.catalog.exceptions.TableNotExistException;
+import org.apache.flink.util.StringUtils;
+
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;
+import org.apache.hadoop.hive.metastore.IMetaStoreClient;
+import org.apache.hadoop.hive.metastore.RetryingMetaStoreClient;
+import org.apache.hadoop.hive.metastore.api.AlreadyExistsException;
+import org.apache.hadoop.hive.metastore.api.Database;
+import org.apache.hadoop.hive.metastore.api.InvalidOperationException;
+import org.apache.hadoop.hive.metastore.api.MetaException;
+import org.apache.hadoop.hive.metastore.api.NoSuchObjectException;
+import org.apache.thrift.TException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.List;
+
+import static org.apache.flink.util.Preconditions.checkArgument;
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * A catalog that persists all Flink streaming and batch metadata by using Hive metastore as a persistent storage.
+ */
+public class GenericHiveMetastoreCatalog implements ReadableWritableCatalog {
+	private static final Logger LOG = LoggerFactory.getLogger(GenericHiveMetastoreCatalog.class);
+
+	public static final String DEFAULT_DB = "default";
+
+	private final String catalogName;
+	private final HiveConf hiveConf;
+
+	private String currentDatabase = DEFAULT_DB;
+	private IMetaStoreClient client;
+
+	public GenericHiveMetastoreCatalog(String catalogName, String hivemetastoreURI) {
+		this(catalogName, getHiveConf(hivemetastoreURI));
+	}
+
+	public GenericHiveMetastoreCatalog(String catalogName, HiveConf hiveConf) {
+		checkArgument(!StringUtils.isNullOrWhitespaceOnly(catalogName), "catalogName cannot be null or empty");
+		this.catalogName = catalogName;
+
+		this.hiveConf = checkNotNull(hiveConf, "hiveConf cannot be null");
+		LOG.info("Created GenericHiveMetastoreCatalog '{}'", catalogName);
+	}
+
+	private static HiveConf getHiveConf(String hiveMetastoreURI) {
+		checkArgument(!StringUtils.isNullOrWhitespaceOnly(hiveMetastoreURI), "hiveMetastoreURI cannot be null or empty");
+
+		HiveConf hiveConf = new HiveConf();
+		hiveConf.setVar(HiveConf.ConfVars.METASTOREURIS, hiveMetastoreURI);
+		return hiveConf;
+	}
+
+	private static IMetaStoreClient getmetastoreClient(HiveConf hiveConf) {
 
 Review comment:
   Good catch

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