We (BackType) recently released our database ElephantDB as open
source. I thought that the Clojure community at large would find this
project interesting as it's written in Clojure.
ElephantDB is a specialized database for exporting key/value data from
Hadoop and serving it in a read-only fashion. It has seemless
integration with Cascalog through the elephantdb-cascalog project.
ElephantDB makes use of Hadoop, Thrift, and BerkeleyDB Java Edition.
Writing this database in Clojure was a great experience. The place
where Clojure really shined was for writing the unit tests. Clojure's
dynamic capabilities made it really easy to do things like mock out
remote servers or mock out pieces that weren't deterministic so that
they could be tested. There were a few key macros I wrote for testing
purposes that made it a lot easier to write and understand the tests.
If you'd like to know more about the project, check out our
introductory blog post and the GitHub repos.
http://tech.backtype.com/introducing-elephantdb-a-distributed-database
https://github.com/nathanmarz/elephantdb
https://github.com/nathanmarz/elephantdb-cascalog
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