veghlaci05 commented on code in PR #4384: URL: https://github.com/apache/hive/pull/4384#discussion_r1260685117
########## standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/retryhandling/RetryHandler.java: ########## @@ -0,0 +1,345 @@ +/* + * 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.metastore.txn.retryhandling; + +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.hive.metastore.DatabaseProduct; +import org.apache.hadoop.hive.metastore.api.MetaException; +import org.apache.hadoop.hive.metastore.conf.MetastoreConf; +import org.apache.hadoop.hive.metastore.txn.MetaWrapperException; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import org.springframework.dao.DataAccessException; +import org.springframework.jdbc.UncategorizedSQLException; +import org.springframework.transaction.TransactionDefinition; +import org.springframework.transaction.TransactionStatus; +import org.springframework.transaction.support.TransactionTemplate; + +import java.sql.SQLException; +import java.util.Objects; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.locks.ReentrantLock; +import java.util.regex.Pattern; + +/** + * Supports building resilient APIs by automatically retrying failed function calls. + */ +public class RetryHandler { + + private static final Logger LOG = LoggerFactory.getLogger(RetryHandler.class); + + private static final int ALLOWED_REPEATED_DEADLOCKS = 10; + private static final String MANUAL_RETRY = "ManualRetry"; + + /** + * Derby specific concurrency control + */ + private static final ReentrantLock derbyLock = new ReentrantLock(true); Review Comment: I think it is still required, I faced deadlock issues with Derby elsewhere in the code recently and had to use locking to solve it. However, I'm not completely sure to be honest. -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
