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https://issues.apache.org/jira/browse/HADOOP-1766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HADOOP-1766:
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Attachment: blockInfo.patch
> Merging Block and BlockInfo classes on name-node.
> -------------------------------------------------
>
> Key: HADOOP-1766
> URL: https://issues.apache.org/jira/browse/HADOOP-1766
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.14.0
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: 0.15.0
>
> Attachments: blockInfo.patch
>
>
> In current implementation
> - BlocksMap references BlockInfo
> - INode references Block
> - BlockInfo contains a reference to the corresponding Block
> It would be better to incorporate Block into BlockInfo and reference the
> latter everywhere in name-node structures.
> This saves 24 bytes per block on a 64-bit jvm as stated in HADOOP-1687 (5).
> I retained the Block class as a structure for external (client and data-node)
> communication.
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