Hi everyone, I would like to get some opinions from our Scala users, therefore I'm also looping in the user mailing list.
Flink currently is tied to Scala 2.12.7. As outlined in FLINK-12461 [1] there is a binary incompatibility introduced by Scala 2.12.8, which currently limits Flink from upgrading to a later Scala 2.12 version. According to the Scala 2.12.8 release notes, "The fix is not binary compatible: the 2.12.8 compiler omits certain methods that are generated by earlier 2.12 compilers. However, we believe that these methods are never used and existing compiled code will continue to work" We could still consider upgrading to a later Scala 2.12 version, the latest one currently being 2.12.15. Next to any benefits that are introduced in the newer Scala versions, it would also resolve a blocker for Flink to add support for Java 17 [2]. My question to Scala users of Flink and others who have an opinion on this: * Has any of you already manually compiled Flink with Scala 2.12.8 or later? * If so, have you experienced any problems with checkpoint and/or savepoint incompatibility? * Would you prefer Flink breaking binary compatibility by upgrading to a later Scala 2.12 version or would you prefer Flink to stick with Scala 2.12.7? Note: I know there are also questions about Scala 2.13 and Scala 3 support in Flink; I think that deserves its own discussion thread. Best regards, Martijn Visser https://twitter.com/MartijnVisser82 https://github.com/MartijnVisser [1] https://issues.apache.org/jira/browse/FLINK-12461 [2] https://issues.apache.org/jira/browse/FLINK-25000
