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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:
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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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