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Posted to common-issues@hadoop.apache.org by "Jingguo Yao (JIRA)" <ji...@apache.org> on 2010/11/23 15:05:14 UTC
[jira] Updated: (HADOOP-7048) Wrong description of Block-Compressed
SequenceFile Format in SequenceFile's javadoc
[ https://issues.apache.org/jira/browse/HADOOP-7048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jingguo Yao updated HADOOP-7048:
--------------------------------
Attachment: HADOOP-7048.patch
Patch available.
> 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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