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| <h1>Welcome to Hadoop!</h1> |
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| <li> |
| <a href="#Getting+Started"> Getting Started </a> |
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| <li> |
| <a href="#Getting+Involved"> Getting Involved </a> |
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| |
| <p> |
| Hadoop is a software platform lets one easily write and run |
| applications that process vast amounts of data.</p> |
| |
| |
| <p>Here's what makes Hadoop especially useful:</p> |
| |
| <ul> |
| |
| <li> |
| <strong>Scalable:</strong> |
| Hadoop can reliably store and process petabytes.</li> |
| |
| <li> |
| <strong>Economical:</strong> |
| It distributes the data and processing across clusters of |
| commonly available computers. These clusters can number into the |
| thousands of nodes.</li> |
| |
| <li> |
| <strong>Efficient:</strong> |
| By distributing the data, Hadoop can process it in parallel on |
| the nodes where the data is located. This makes it extremely |
| rapid.</li> |
| |
| <li> |
| <strong>Reliable:</strong> |
| Hadoop automatically maintains multiple copies of data and |
| automatically redeploys computing tasks based on failures.</li> |
| |
| </ul> |
| |
| <p> |
| Hadoop implements <a href="http://wiki.apache.org/lucene-hadoop/HadoopMapReduce">MapReduce</a>, |
| using the Hadoop Distributed File System (<a href="hdfs_design.html"><acronym title="Hadoop Distributed File System">HDFS</acronym></a>) (see figure below.) MapReduce divides |
| applications into many small blocks of work. HDFS creates |
| multiple replicas of data blocks for reliability, placing them on |
| compute nodes around the cluster. MapReduce can then process the |
| data where it is located. |
| </p> |
| |
| |
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| |
| |
| <a name="N1003A"></a><a name="Getting+Started"></a> |
| <h2 class="h3"> Getting Started </h2> |
| <div class="section"> |
| <p> |
| The Hadoop project plans to scale Hadoop up to handling thousands of computers. However, to begin with you can start by installing in on a single machine or a very small cluster. |
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| |
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| <a href="documentation.html">Learn about</a> Hadoop by reading the documentation.</li> |
| |
| <li> |
| <a href="releases.html">Download</a> Hadoop from the release page.</li> |
| |
| <li> |
| <a href="api/overview-summary.html#overview_description">Install and configure</a> Hadoop. Scroll down the page.</li> |
| |
| <li> |
| <a href="mailing_lists.html">Discuss it</a> on the mailing list.</li> |
| |
| </ol> |
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| |
| |
| <a name="N1005F"></a><a name="Getting+Involved"></a> |
| <h2 class="h3"> Getting Involved </h2> |
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| <p> |
| Hadoop is an open source volunteer project under the Apache Software Foundation. We encourage you to learn about the project and contribute your expertise. Here are some starter links: |
| </p> |
| <ol> |
| |
| <li>See our <a href="http://wiki.apache.org/lucene-hadoop/HowToContribute">How to Contribute to Hadoop</a> page.</li> |
| |
| <li>Give us <a href="issue_tracking.html">feedback</a>: What can we do better?</li> |
| |
| <li>Join the <a href="mailing_lists.html">mailing list</a>: Meet the community.</li> |
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