Narcasserun commented on code in PR #10526: URL: https://github.com/apache/dolphinscheduler/pull/10526#discussion_r903190198
########## dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-hive/src/main/java/org/apache/dolphinscheduler/plugin/datasource/hive/MetaStoreClientPool.java: ########## @@ -0,0 +1,203 @@ +/* + * 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.dolphinscheduler.plugin.datasource.hive; + +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.hive.conf.HiveConf; +import org.apache.hadoop.hive.metastore.HiveMetaHook; +import org.apache.hadoop.hive.metastore.HiveMetaHookLoader; +import org.apache.hadoop.hive.metastore.HiveMetaStoreClient; +import org.apache.hadoop.hive.metastore.api.MetaException; +import org.apache.log4j.Logger; + +import java.util.concurrent.ConcurrentLinkedQueue; +import java.util.concurrent.TimeUnit; + +import com.google.common.base.Preconditions; + +/** + * Manages a pool of RetryingMetaStoreClient connections. If the connection pool is empty + * a new client is created and added to the pool. The idle pool can expand till a maximum + * size of MAX_HMS_CONNECTION_POOL_SIZE, beyond which the connections are closed. + * + * This default implementation reads the Hive metastore configuration from the HiveConf + * object passed in the c'tor. If you are looking for a temporary HMS instance created + * from scratch for unit tests, refer to EmbeddedMetastoreClientPool class. It mocks an + * actual HMS by creating a temporary Derby backend database on the fly. It should not + * be used for production Catalog server instances. + */ +public class MetaStoreClientPool { Review Comment: how to add license? -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
