aokolnychyi commented on a change in pull request #1862: URL: https://github.com/apache/iceberg/pull/1862#discussion_r535043116
########## File path: api/src/main/java/org/apache/iceberg/IsolationLevel.java ########## @@ -0,0 +1,39 @@ +/* + * 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.iceberg; + +/** + * An isolation level in a table. + * <p> + * Two isolation levels are supported: serializable and snapshot isolation. Both of them provide + * a read consistent view of the table to all operations and allow readers to see only already + * committed data. While serializable is the strongest isolation level in databases, + * snapshot isolation is beneficial for environments with many concurrent writers. + * <p> + * The serializable isolation level guarantees that an ongoing UPDATE/DELETE/MERGE operation + * fails if a concurrent transaction commits a new file that might contain rows matching + * the condition used in UPDATE/DELETE/MERGE. For example, if there is an ongoing update + * on a subset of rows and a concurrent transaction adds a new file with records + * that potentially match the update condition, the update operation must fail under + * the serializable isolation but can still commit under the snapshot isolation. + */ +public enum IsolationLevel { Review comment: Sound good to me. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
