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From "Jingguo Yao (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-7048) Wrong description of Block-Compressed SequenceFile Format in SequenceFile's javadoc
Date Tue, 23 Nov 2010 14:05:15 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jingguo Yao updated HADOOP-7048:
--------------------------------

    Status: Patch Available  (was: Open)

> 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
>         Attachments: HADOOP-7048.patch
>
>   Original Estimate: 0.17h
>  Remaining Estimate: 0.17h
>
> 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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