jihoonson commented on a change in pull request #8311: Docusaurus build framework + ingestion doc refresh. URL: https://github.com/apache/incubator-druid/pull/8311#discussion_r315439786
########## File path: docs/ingestion/data-management.md ########## @@ -0,0 +1,255 @@ +--- +id: data-management +title: "Data management" +--- + +<!-- + ~ 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. + --> + + + + +## Schema changes + +Schemas for datasources can change at any time and Apache Druid (incubating) supports different schemas among segments. + +### Replacing segments + +Druid uniquely +identifies segments using the datasource, interval, version, and partition number. The partition number is only visible in the segment id if +there are multiple segments created for some granularity of time. For example, if you have hourly segments, but you +have more data in an hour than a single segment can hold, you can create multiple segments for the same hour. These segments will share +the same datasource, interval, and version, but have linearly increasing partition numbers. + +``` +foo_2015-01-01/2015-01-02_v1_0 Review comment: It could be better if we use a more realistic version than `v1`. ---------------------------------------------------------------- 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] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
