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ASF GitHub Bot commented on HUDI-1548: -------------------------------------- danny0405 commented on a change in pull request #3257: URL: https://github.com/apache/hudi/pull/3257#discussion_r672063103 ########## File path: docs/_docs/2_2_writing_data.md ########## @@ -424,3 +424,192 @@ Here are some ways to efficiently manage the storage of your Hudi tables. - Intelligently tuning the [bulk insert parallelism](/docs/configurations.html#withBulkInsertParallelism), can again in nicely sized initial file groups. It is in fact critical to get this right, since the file groups once created cannot be deleted, but simply expanded as explained before. - For workloads with heavy updates, the [merge-on-read table](/docs/concepts.html#merge-on-read-table) provides a nice mechanism for ingesting quickly into smaller files and then later merging them into larger base files via compaction. + + +## Schema Evolution + +Schema evolution is a very important aspect of data management. +Hudi supports common schema evolution scenarios, such as adding a nullable field or promoting a datatype of a field, out-of-the-box. +Furthermore, the evolved schema is queryable across engines, such as Presto, Hive and Spark SQL. +The following table presents a summary of the types of schema changes compatible with different Hudi table types. + +| Schema Change | COW | MOR | Remarks | Review comment: Thanks, let us take a look ~ -- 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: commits-unsubscr...@hudi.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org > Fix documentation around schema evolution > ------------------------------------------ > > Key: HUDI-1548 > URL: https://issues.apache.org/jira/browse/HUDI-1548 > Project: Apache Hudi > Issue Type: Improvement > Components: Docs > Reporter: sivabalan narayanan > Assignee: Nishith Agarwal > Priority: Blocker > Labels: ', pull-request-available, sev:high, user-support-issues > Fix For: 0.9.0 > > > Clearly call out what kind of schema evolution is supported by hudi in > documentation . > Context: https://github.com/apache/hudi/issues/2331 -- This message was sent by Atlassian Jira (v8.3.4#803005)