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Apache Accumulo
What it is
Apache Accumulo is a free, open-source distributed key/value store for storing and retrieving large datasets across a cluster. It uses Apache Hadoop HDFS for storage and Apache ZooKeeper for consensus. Accumulo Iterators can alter key/value pairs at different stages of data management, while a security label on each pair can restrict query results according to user authorizations. Clusters can run with one or more HDFS instances, and nodes can be added or removed as data needs change. The project says its client API follows Long Term Maintenance releases and semantic versioning, and that each release undergoes extensive testing. It is licensed under Apache License, Version 2.0. Available downloads include source and binary archives for 4.0.0-alpha-1, 3.0.0, and 2.1.6; the project identifies 4.0.0-alpha-1 as an alpha release and cautions that alpha and beta releases are not production ready. Users can turn to a mailing list for general questions, and contributors to a separate dev list. An interactive tour introduces the Java API through exercises and is intended for Accumulo 2.1.x or later.
For and against
For
- Distributed storage and retrieval across a cluster.
- Security labels can limit query results.
- Cluster nodes can be added or removed.
- Interactive Java API tour includes exercises.
Against
- The 4.0.0-alpha-1 release is not production ready.
- No free trial is listed.
The verdict
Accumulo combines cluster-based data storage with per-key/value authorization and server-side Iterators. Its listed alpha release is explicitly not production ready, so release maturity matters when choosing a download.
Who it suits
It is suited to teams that need distributed storage and retrieval for large datasets, with per-record query restrictions and the ability to adjust cluster nodes. The project also provides a Java API tour and separate user and developer mailing lists.
Plans and prices
Apache Accumulo
Open-source sorted, distributed key/value store · Apache License 2.0
Read 4 Oct 2026 · accumulo.apache.org
On the record
- Access control
- Each key/value pair has its own security label, which limits query results based on user authorizations.accumulo.apache.org · read 4 Oct 2026
- API stability
- The project says its client API follows Long Term Maintenance releases and semantic versioning, and each release undergoes extensive testing.accumulo.apache.org · read 4 Oct 2026
- Community support
- The project provides a user mailing list for general questions and help, and a dev list for contributor discussions.accumulo.apache.org · read 4 Oct 2026
- Hands-on learning
- The interactive tour introduces the Accumulo Java API through independent steps and exercises and is designed for Accumulo 2.1.x or greater.accumulo.apache.org · read 4 Oct 2026
- Large datasets
- Users can store and manage large data sets across a cluster.accumulo.apache.org · read 4 Oct 2026
- License
- The Apache Accumulo site identifies the software as licensed under Apache License, Version 2.0.accumulo.apache.org · read 4 Oct 2026
- Maintainer
- Apache Accumulo is an Apache Software Foundation project; the foundation describes itself as a U.S. 501(c)(3) nonprofit founded in 1999.apache.org · read 4 Oct 2026
- Purpose
- Apache Accumulo is a sorted, distributed key/value store for robust, scalable data storage and retrieval.accumulo.apache.org · read 4 Oct 2026
- Release maturity
- The site labels 4.0.0-alpha-1 an alpha release and says alpha or beta releases are not production ready.accumulo.apache.org · read 4 Oct 2026
- Release options
- The downloads page lists source and binary archives for Accumulo 4.0.0-alpha-1, 3.0.0, and 2.1.6.accumulo.apache.org · read 4 Oct 2026
- Scalability
- Accumulo runs on a cluster using one or more HDFS instances, and nodes can be added or removed as stored data changes.accumulo.apache.org · read 4 Oct 2026
- Security reporting
- The project asks that potential security issues be reported privately by email and says it follows the ASF vulnerability handling process.accumulo.apache.org · read 4 Oct 2026
- Server-side programming
- Accumulo Iterators can modify key/value pairs at various points in the data management process.accumulo.apache.org · read 4 Oct 2026
- Storage and coordination
- Accumulo uses Apache Hadoop HDFS to store its data and Apache ZooKeeper for consensus.accumulo.apache.org · read 4 Oct 2026
