Katta - Lucene in the cloud.

Katta is a scalable, failure tolerant, distributed, indexed, data storage.
Katta serves large, replicated, Lucene indexes as shards to serve high loads and very large data sets.

• Makes serving large or high load Lucene indexes easy
• Serves very large Lucene indexes as index shards on many servers
• Replicate shards on different servers for performance and fault-tolerance
• Supports pluggable network topologies
• Master fail-over
• Fast, lightweight, easy to integrate
• Plays well with Hadoop clusters
• Apache Version 2 License

For more information read our About Katta Page, try the Katta Quick Start, browse the Katta Documentation or subscribe to the Katta Mailing List (archive).
There is also a #katta channel @ irc.freenode.net. Please use #katta in your twitter messages.

Ted Dunning:
“We are using a variant of Katta as the basis of some of our search at
Deepdyve. Very, very nice. …
Much of the simplicity and reliability of Katta is directly inherited from
the simple programming model and solid implementation of Zookeeper.”