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https://issues.apache.org/jira/browse/HDFS-2006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13980598#comment-13980598
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Yi Liu commented on HDFS-2006:
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Thanks Chris.
For maximum limit of XAtters number per inode, agree with [~apurtell]. Refer to 
 http://wiki.linuxquestions.org/wiki/Extended_attributes, we can get "maximum 
number of attributes on each file/directory is limited by the implementation of 
the filesystem".
In HDFS, our thought is to have a configuration property for maximum limit.

> 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, 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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