+1 I was on a project that ended up not using kafka - and this was one reason: there are many other third party libraries that do not even have 2.9 versions so the interdependencies did not work.
2015-03-27 7:34 GMT-07:00 Stevo Slavić <ssla...@gmail.com>: > +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 > > >
