Hey guys, This may be relevant to people on this list. A few of us at LinkedIn have been working on Samza, a stream processing framework built on YARN. We just added this as an Apache Incubator project. We would love to get people's feedback (and help!). Here are the docs:
http://samza.incubator.apache.org If anyone has any questions I'm happy to discuss what we are up to. Our mailing list is here: http://samza.incubator.apache.org/community/mailing-lists.html -Jay