any pointers ?

it might be a transient error.. we should probably add a profile to build only pinot core modules with minimal extensions

I see some people reporting this as an issue caused by the Confluent Maven repo not working with mirroring. If that’s the issue for you, see https://stackoverflow.com/questions/43488853/confluent-maven-repository-not-working for solutions, easiest might be to explicitly add to the pom.xml:

<repositories>
    <repository>
        <id>confluent</id>
        <url><http://packages.confluent.io/maven/></url>
    </repository>
</repositories>