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https://issues.apache.org/jira/browse/ACCUMULO-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573697#comment-13573697
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Keith Turner commented on ACCUMULO-164:
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bq. We've already extended the original idea behind locality groups, by 
allowing users to specify more than one column family for a locality group.

Accumulo did not extend it.  The Big Table paper described a locality group as 
a set of column families.   In Hbase each col fam is a locality group.  
Accumulo may differ from Big Table in that it allows user to change what col 
fams are in a locality group, not sure about this.  It also differs by having a 
default locality group.
                
> Add support for wildcards/regexes in locality group setting.
> ------------------------------------------------------------
>
>                 Key: ACCUMULO-164
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-164
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client, master, tserver
>            Reporter: John Vines
>             Fix For: 1.6.0
>
>
> We should look into adding the ability to specify locality group columns as 
> either wildcarding or regexes. I'm unsure of the feasibility of this, hence 
> the lack of fix date.

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