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https://issues.apache.org/jira/browse/ACCUMULO-227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174383#comment-13174383
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John Vines commented on ACCUMULO-227:
-------------------------------------

Yes, mutations are a list of columns, not sets. This is useful for operations 
where you are doing aggregation and it's more efficient to reuse mutations.
                
> Improve isolation to provide cell level isolation instead of mutation level
> ---------------------------------------------------------------------------
>
>                 Key: ACCUMULO-227
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-227
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: tserver
>            Reporter: John Vines
>            Assignee: John Vines
>              Labels: isolation
>             Fix For: 1.5.0
>
>
> Currently for isolation we only isolate mutations. This doesn't allow 
> mutations with identical cells within it. We should increase the scope of 
> isolation to account for each individual cell instead of each mutation.

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