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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2006) ability to support storing extended attributes per file
Date Wed, 14 May 2014 02:26:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997202#comment-13997202

Tsz Wo Nicholas Sze commented on HDFS-2006:

Thanks [~cnauroth] for showing me the pointer.  I will look at the code in more details.

Although large value is not yet supported in the current phase, the "XAttr with large value"
section in the design doc should mention that if  large value is supported, the large values
should not be written to edit log.  Otherwise, edit log will grow very fast.

Also, I think we should have different limits for different XAttr namespaces (user, trusted,
security and system) since we may want to put a smaller limit for the user visible namespaces.
 How does it sound?

> ability to support storing extended attributes per file
> -------------------------------------------------------
>                 Key: HDFS-2006
>                 URL: https://issues.apache.org/jira/browse/HDFS-2006
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: HDFS XAttrs (HDFS-2006)
>            Reporter: dhruba borthakur
>            Assignee: Yi Liu
>         Attachments: HDFS-XAttrs-Design-1.pdf, HDFS-XAttrs-Design-2.pdf, HDFS-XAttrs-Design-3.pdf,
Test-Plan-for-Extended-Attributes-1.pdf, xattrs.1.patch, xattrs.patch
> It would be nice if HDFS provides a feature to store extended attributes for files, similar
to the one described here: http://en.wikipedia.org/wiki/Extended_file_attributes. 
> The challenge is that it has to be done in such a way that a site not using this feature
does not waste precious memory resources in the namenode.

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