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POHBase Key-Value Compression?
 

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  1. POHBase Key-Value Compression?
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    <p>Thanks for taking interest in my question. Before I begin, I'd like to let you know that I'm very new to Hadoop &amp; HBase. So far, I find Hadoop very interesting and would like to contribute more in the future.</p> <p>I'm primarily interested in improving performance of HBase. To do so, I had modified <code>Writer</code> methods in HBase's <code>/io/hfile/Hfile.java</code> in a way that it does high-speed buffered data assembly and then directly write to Hadoop so that it can later be loaded by HBase.</p> <p>Now, I'm trying to come up with a way to compress key-value pairs so that bandwidth could be saved. I've done a lot of research to figure out how; and then realized that HBase has built-in compression libraries.</p> <p>I'm currently looking at SequenceFile <strong>(1)</strong>; setCompressMapOutput <strong>(2)</strong> (deprecated); and Class Compression <strong>(3)</strong>. I also found a <a href="http://hadoop.apache.org/common/docs/current/mapred_tutorial.html#Data+Compression" rel="nofollow">tutorial</a> on Apache's MapReduce. </p> <p>Could someone explain what "SequenceFile" is, and how I can implement those compression libraries and algorithms? These different classes and documents are so confusing to me.</p> <p>I'd sincerely appreciate your help.</p> <p>--</p> <p>Hyperlinks:</p> <p>(1): hadoop.apache.org/common/docs/current/api/org/apache/hadoop/io/SequenceFile.html</p> <p>(2): hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapred/JobConf.html#setCompressMapOutput%28boolean%29</p> <p>(3): www.apache.org/dist/hbase/docs/apidocs/org/apache/hadoop/hbase/io/hfile/Compression.html</p>
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