+1 for dropping 2.9.x support Kind regards, Stevo Slavic.
On Fri, Mar 27, 2015 at 3:20 PM, Ismael Juma <mli...@juma.me.uk> wrote: > Hi all, > > The Kafka build currently includes support for Scala 2.9, which means that > it cannot take advantage of features introduced in Scala 2.10 or depend on > libraries that require it. > > This restricts the solutions available while trying to solve existing > issues. I was browsing JIRA looking for areas to contribute and I quickly > ran into two issues where this is the case: > > * KAFKA-1351: "String.format is very expensive in Scala" could be solved > nicely by using the String interpolation feature introduced in Scala 2.10. > > * KAFKA-1595: "Remove deprecated and slower scala JSON parser from > kafka.consumer.TopicCount" could be solved by using an existing JSON > library, but both jackson-scala and play-json require 2.10 (argonaut > supports Scala 2.9, but it brings other dependencies like scalaz). We can > workaround this by writing our own code instead of using libraries, of > course, but it's not ideal. > > Other features like Scala Futures and value classes would also be useful in > some situations, I would think (for a more extensive list of new features, > see > > http://scala-language.1934581.n4.nabble.com/Scala-2-10-0-now-available-td4634126.html > ). > > Another pain point of supporting 2.9.x is that it doubles the number of > build and test configurations required from 2 to 4 (because the 2.9.x > series was not necessarily binary compatible). > > A strong argument for maintaining support for 2.9.x was the client library, > but that has been rewritten in Java. > > It's also worth mentioning that Scala 2.9.1 was released in August 2011 > (more than 3.5 years ago) and the 2.9.x series hasn't received updates of > any sort since early 2013. Scala 2.10.0, in turn, was released in January > 2013 (over 2 years ago) and 2.10.5, the last planned release in the 2.10.x > series, has been recently released (so even 2.10.x won't be receiving > updates any longer). > > All in all, I think it would not be unreasonable to drop support for Scala > 2.9.x in a future release, but I may be missing something. What do others > think? > > Ismael >
