Merging Block and BlockInfo classes on name-node.
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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
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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