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https://issues.apache.org/jira/browse/HDFS-8801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14635682#comment-14635682
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Tsz Wo Nicholas Sze commented on HDFS-8801:
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INodeFile has many different features such as FileWithSnapshotFeature,
AclFeature, XAttrFeature so that it needs a Feature class. But BlockInfo only
has two features. So we may not want to covert BlockInfoUnderConstruction as a
feature since it increases memory usage.
Also, BlockInfoUnderConstruction may not be a common feature between contiguous
and striping blocks since they have different uc implementation.
> Convert BlockInfoUnderConstruction as a feature
> -----------------------------------------------
>
> Key: HDFS-8801
> URL: https://issues.apache.org/jira/browse/HDFS-8801
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.7.1
> Reporter: Zhe Zhang
>
> Per discussion under HDFS-8499, with the erasure coding feature, there will
> be 4 types of {{BlockInfo}} forming a multi-inheritance:
> {{complete+contiguous}}, {{complete+striping}}, {{UC+contiguous}},
> {{UC+striped}}. We had the same challenge with {{INodeFile}} and the solution
> was building feature classes like {{FileUnderConstructionFeature}}. This JIRA
> aims to implement the same idea on {{BlockInfo}}.
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