The Apache Accumulo project is happy to announce its 1.6.4 release. Version 1.6.4 is the most recent bug-fix release in its 1.6.x release line. This version includes a fix for a data-loss bug over previous versions in addition to other bug fixes. Existing users of the 1.6.x release line are encouraged to upgrade immediately with confidence. The Apache Accumulo sorted, distributed key/value store is a robust, scalable, high performance data storage system that features cell-based access control and customizable server-side processing. It is based on Google's BigTable design and is built on top of Apache Hadoop, Apache Zookeeper, and Apache Thrift. The release is available at http://accumulo.apache.org/downloads/ and release notes at http://accumulo.apache.org/release_notes/1.6.4.html. - The Apache Accumulo Team