abstractdog commented on code in PR #5613: URL: https://github.com/apache/hive/pull/5613#discussion_r1923858932
########## ql/src/java/org/apache/hadoop/hive/ql/queryhistory/QueryHistoryService.java: ########## @@ -0,0 +1,266 @@ +/* + * 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.hadoop.hive.ql.queryhistory; + +import java.util.ArrayList; +import java.util.List; +import java.util.Queue; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.LinkedBlockingQueue; + +import com.google.common.annotations.VisibleForTesting; +import org.apache.hadoop.hive.conf.HiveConf; +import org.apache.hadoop.hive.ql.DriverContext; +import org.apache.hadoop.hive.ql.QueryState; +import org.apache.hadoop.hive.ql.ServiceContext; +import org.apache.hadoop.hive.ql.queryhistory.persist.QueryHistoryPersistor; +import org.apache.hadoop.hive.ql.queryhistory.schema.QueryHistoryRecord; +import org.apache.hadoop.hive.ql.queryhistory.schema.QueryHistorySchema; +import org.apache.hadoop.hive.ql.session.SessionState; +import org.apache.hive.common.util.ReflectionUtil; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.google.common.util.concurrent.ThreadFactoryBuilder; + +public class QueryHistoryService { + private static final Logger LOG = LoggerFactory.getLogger(QueryHistoryService.class); + + private static QueryHistoryService INSTANCE = null; + + private QueryHistoryPersistor queryHistoryPersistor; + + protected final Queue<QueryHistoryRecord> queryHistoryQueue = new LinkedBlockingQueue<>(); + private int maxBatchSize = 0; + private int maxQueueSizeInMemoryBytes = 0; + + private final ExecutorService persistExecutor = Executors.newFixedThreadPool(1, + new ThreadFactoryBuilder().setNameFormat("QueryHistoryService persistor thread").build()); + + private ServiceContext serviceContext; + + public static QueryHistoryService start(HiveConf inputConf, ServiceContext serviceContext) { + HiveConf conf = new HiveConf(inputConf); + // we can only hit this codepath if the INSTANCE is already initialized while calling start(...) + // for convenient test compatibility, this call is allowed to be idempotent (LOG.warn instead of exception) + if (INSTANCE != null) { + LOG.warn("There is already a QueryHistoryService instance ({}), returning existing instance", INSTANCE); Review Comment: hm, we don't, let me remove in the early stages, the singleton design changed quite often, but I'm ready to refactor this are and get rid of the message -- 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: gitbox-unsubscr...@hive.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org
