The Apache Accumulo project is pleased to announce the release of Apache Accumulo 1.9.1! This release contains fixes for **critical** bugs, which could result in *data loss* during recovery from a previous failure. (See the release notes linked below for details.)
Versions 1.8.0, 1.8.1, and 1.9.0 are affected, and users of those versions are encouraged to upgrade to this version immediately to avoid data loss. Users of earlier versions who are planning to upgrade to one of the affected versions are encouraged to upgrade directly to this version instead.
Apache Accumulo® is a sorted, distributed key/value store that provides robust, scalable data storage and retrieval. With Apache Accumulo, users can store and manage large data sets across a cluster. Accumulo uses Apache Hadoop's HDFS to store its data and Apache ZooKeeper for consensus.