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It seems like there are a few different projects under the Apache umbrella vying to be the thing that replaces Hadoop. Can anyone compare/contrast them, and in particular, offer pros/cons of Flink vs. Apache Spark?

The same question was asked on their mailing list https://www.mail-archive.com/user@flink.incubator.apache.org...

Also (later on in the same thread) a comparison with Drill https://www.mail-archive.com/user@flink.incubator.apache.org...

Yeah. I feel like the Apache project needs a roadmap just of its own projects.

Recent interview with some committers: http://sdtimes.com/inside-apache-software-foundations-newest...

Publications from the academic project that spawned this work can apparently be found here: http://stratosphere.eu/project/publications/

I also found the slideshare helpful (it's a little more "tl;dr"):

http://www.slideshare.net/GyulaFra/flink-apachecon

Apache Flink – Fast and reliable large-scale data processing engine