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From "Jingguo Yao (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-7048) Wrong description of Block-Compressed SequenceFile Format in SequenceFile's javadoc
Date Tue, 23 Nov 2010 14:04:16 GMT
Wrong description of Block-Compressed SequenceFile Format in SequenceFile's javadoc
-----------------------------------------------------------------------------------

                 Key: HADOOP-7048
                 URL: https://issues.apache.org/jira/browse/HADOOP-7048
             Project: Hadoop Common
          Issue Type: Improvement
          Components: io
    Affects Versions: 0.21.0
            Reporter: Jingguo Yao
            Priority: Minor


Here is the following description for Block-Compressed SequenceFile Format in SequenceFile's
javadoc:

 * <li>
 * Record <i>Block</i>
 *   <ul>
 *     <li>Compressed key-lengths block-size</li>
 *     <li>Compressed key-lengths block</li>
 *     <li>Compressed keys block-size</li>
 *     <li>Compressed keys block</li>
 *     <li>Compressed value-lengths block-size</li>
 *     <li>Compressed value-lengths block</li>
 *     <li>Compressed values block-size</li>
 *     <li>Compressed values block</li>
 *   </ul>
 * </li>
 * <li>
 * A sync-marker every few <code>100</code> bytes or so.
 * </li>

This description misses "Uncompressed record number in the block". And "A sync-marker every
few <code>100</code> bytes or so" is not the case for Block-Compressed SequenceFile
Format. Correct description should be:

 * <li>
 * Record <i>Block</i>
 *   <ul>
 *     <li>Uncompressed record number in the block</li>
 *     <li>Compressed key-lengths block-size</li>
 *     <li>Compressed key-lengths block</li>
 *     <li>Compressed keys block-size</li>
 *     <li>Compressed keys block</li>
 *     <li>Compressed value-lengths block-size</li>
 *     <li>Compressed value-lengths block</li>
 *     <li>Compressed values block-size</li>
 *     <li>Compressed values block</li>
 *   </ul>
 * </li>
 * <li>
 * A sync-marker every block.
 * </li>



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