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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5285) Flatten INodeFile hierarchy
Date Thu, 03 Oct 2013 15:38:44 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE updated HDFS-5285:
-----------------------------------------

    Attachment: h5285_20131002.patch

h5285_20131002.patch: fixes compilation errors.

> Flatten INodeFile hierarchy
> ---------------------------
>
>                 Key: HDFS-5285
>                 URL: https://issues.apache.org/jira/browse/HDFS-5285
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h5285_20131001.patch, h5285_20131002.patch
>
>
> For files, there are INodeFile, INodeFileUnderConstruction, INodeFileWithSnapshot and
INodeFileUnderConstructionWithSnapshot for representing whether a file is under construction
or whether it is in some snapshot.  The following are two major problems of the current approach:
> - Java class does not support multiple inheritances so that INodeFileUnderConstructionWithSnapshot
cannot extend both INodeFileUnderConstruction and INodeFileWithSnapshot.
> - The number of classes is exponential to the number of features.  Currently, there are
only two features, UnderConstruction and WithSnapshot.  The number of classes is 2^2 = 4.
 It is hard to add one more feature since the number of classes will become 2^3 = 8.



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