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https://issues.apache.org/jira/browse/KAFKA-3889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15342984#comment-15342984
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Ismael Juma commented on KAFKA-3889:
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Scala 2.10 is used if you do `./gradlew test` or `./gradlew jar` (instead of
`./gradlew testAll` and `./gradlew jarAll`). During development, we typically
use the `test` variant while Jenkins uses the `testAll` variant. The latter
takes longer obviously.
> Change default Scala version to 2.11
> ------------------------------------
>
> Key: KAFKA-3889
> URL: https://issues.apache.org/jira/browse/KAFKA-3889
> Project: Kafka
> Issue Type: Improvement
> Components: build, tools
> Reporter: Kevin Lafferty
> Priority: Minor
>
> The [downloads page|http://kafka.apache.org/downloads.html] says that Scala
> 2.11 is recommended. However, 2.10 is the default build version as well as
> the default in the bin scripts.
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