jackye1995 commented on code in PR #6600: URL: https://github.com/apache/iceberg/pull/6600#discussion_r1150948444
########## docs/table-migration.md: ########## @@ -0,0 +1,89 @@ +--- +title: "Table Migration" +url: table-migration +weight: 1300 +menu: main +--- +<!-- + - 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. + --> +# Table Migration +Apache Iceberg supports converting existing tables in other formats to Iceberg tables. This section introduces the general concept of table migration, its approaches, and existing implementations in Iceberg. + +## Migration Approaches +There are two main approaches to perform table migration: CTAS (Create Table As Select) and in-place migration. + +### Create-Table-As-Select Migration +CTAS migration involves creating a new Iceberg table and copying data from the existing table to the new one. This method is preferred when you want to completely cut ties with your old table, ensuring the new table is independent and fully managed by Iceberg. +However, CTAS migration may require more time to complete and might not be suitable for production use cases where downtime is not acceptable. + +### In-Place Migration +In-place migration retains the existing data files but adds Iceberg metadata on top of them. This approach is faster and does not require copying data, making it more suitable for production use cases. + +## In-Place Migration Actions +Apache Iceberg primarily supports the in-place migration approach, which includes three important actions: + +1. Snapshot Table Review Comment: since you already have dedicated sections below, we don't need to list them out here -- 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]
