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https://issues.apache.org/jira/browse/ACCUMULO-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437749#comment-15437749
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Christopher Tubbs commented on ACCUMULO-3948:
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I've got a patch I'm testing now to fix this.

> Enable A/B testing of scan iterators on a table
> -----------------------------------------------
>
>                 Key: ACCUMULO-3948
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3948
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: tserver
>            Reporter: Dave Marion
>            Assignee: Dave Marion
>            Priority: Blocker
>             Fix For: 1.8.0
>
>         Attachments: ACCUMULO-3948.1-6-3.patch, TestIterator.patch
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Classpath contexts are assigned to a table via the table configuration. You 
> can test at scale by cloning your table and assigning a new classpath context 
> to the cloned table. However, you would also need to change your application 
> to use the new table names and since we cannot disable compactions you would 
> start to consume more space in the filesystem for that table. We can support 
> users passing in a context name to use for the scan on existing tables. 



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