cloud-fan commented on code in PR #52642: URL: https://github.com/apache/spark/pull/52642#discussion_r2463840301
########## docs/streaming/ss-migration-guide.md: ########## @@ -23,6 +23,10 @@ Note that this migration guide describes the items specific to Structured Stream Many items of SQL migration can be applied when migrating Structured Streaming to higher versions. Please refer [Migration Guide: SQL, Datasets and DataFrame](../sql-migration-guide.html). +## Upgrading from Structured Streaming 4.0 to 4.1 + +- Since Spark 4.1, AQE is supported for stateless workloads, and it could affect the behavior of the query after upgrade (especially since AQE is turned on by default). In general, it helps to achieve better performance including resolution of skewed partition, but you can turn off AQE via changing `spark.sql.adaptive.enabled` to `false` to restore the behavior if you see regression. Review Comment: shall we have a dedicated config for streaming AQE? It seems overkill to turn off AQE entirely. -- 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]
