Title: Apache Accumulo
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The Apache Accumulo&trade; sorted, distributed key/value store is a robust, scalable, high performance data storage and retrieval system.  
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Apache Accumulo is based on Google's [BigTable][1] design and is built on
top of Apache [Hadoop][2], [Zookeeper][3], and [Thrift][4].  Apache Accumulo features a few novel 
improvements on the BigTable design in the form of cell-based access control and a server-side
programming mechanism that can modify key/value pairs at various points in the
data management process.  Other notable improvements and feature are outlined
[here](notable_features.html).

Google published the design of BigTable in 2006.  Several other open source
projects have implemented aspects of this design including [HBase][5], [Hypertable][6],
and [Cassandra][7].  Accumulo began its development in 2008 and joined the [Apache community][8] in 2011.

[1]: http://research.google.com/archive/bigtable.html "BigTable"
[2]: http://hadoop.apache.org/                   "Hadoop"
[3]: http://zookeeper.apache.org                 "Zookeeper"
[4]: http://thrift.apache.org                    "Thrift"
[5]: http://hbase.apache.org                     "HBase"
[6]: http://hypertable.org                       "Hypertable"
[7]: http://cassandra.apache.org                 "Cassandra"
[8]: http://www.apache.org/                      "Apache Software Foundation"