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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 Tue, 13 May 2014 15:41:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13996507#comment-13996507
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Tsz Wo Nicholas Sze commented on HDFS-2006:
-------------------------------------------

The latest design looks good.

For a XAttr with large value, writing it to editlog may be a problem.  Do we plan to have
a size limit on the size of XAttr values?

> 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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