FAQ
Wrong description of Block-Compressed SequenceFile Format in SequenceFile's javadoc
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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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postedNov 23, '10 at 2:04p
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