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title: Apache Accumulo
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legal_notice: Apache Accumulo, Apache Hadoop, and the Accumulo project logo are trademarks<br>of the [Apache Software Foundation](https://www.apache.org).
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      <h3>Apache Accumulo&reg; is a sorted, distributed key/value store that provides robust, scalable data storage and retrieval.</h3>
      <a class="btn btn-success" href="downloads/" role="button"><i class="fa fa-download fa-lg"></i> Download</a>
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    <p id="home-description">Apache Accumulo is a key/value store based on the design of Google's <a href="https://research.google.com/archive/bigtable.html">BigTable</a>. Accumulo stores its data in <a href="https://hadoop.apache.org">Apache Hadoop</a>'s HDFS and uses <a href="https://zookeeper.apache.org">Apache Zookeeper</a> for consensus. While many users interact directly with Accumulo, several <a href="/related-projects">open source projects</a> use Accumulo as their underlying store.</p>
    <p id="home-description">To learn more about Accumulo, take the <a href="/tour">Accumulo tour</a>, read the <a href="/{{ site.latest_minor_release }}/accumulo_user_manual.html">user manual</a> and run the Accumulo <a href="https://github.com/apache/accumulo-examples">example code</a>. Feel free to <a href="/contact-us">contact us</a> if you have any questions.

    <h3>Major Features</h3>

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        <h4>Server-side programming</h4>
        <p>Accumulo has a programing meachinism (called Iterators) that can modify key/value pairs at various points in the data management process.</p>
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        <h4>Cell-based access control</h4>
        <p>Every Accumulo key/value pair has its own security label which limits query results based off user authorizations.</p>
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        <h4>Designed to scale</h4>
        <p>Accumulo runs on a cluster using one or more HDFS instances. Nodes can be added or removed as the amount of data stored in Accumulo changes.</p>
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        <h4>Stable</h4>
        <p>Accumulo has a stable <a href="/latest/apidocs">client API</a> that follows <a href="https://semver.org">semantic versioning</a>. Each Accumulo release goes through <a href="/features/#testing">extensive testing</a>.</p>
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