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https://issues.apache.org/jira/browse/ACCUMULO-1582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712595#comment-13712595
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Keith Turner commented on ACCUMULO-1582:
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For a scan session the tablet server keeps track of the continue key on the 
server side, the client never sees it.   The tablet server could ensure the 
server side continue key keeps increasing.  On the client side, the scanner 
could ensure the key it uses to start scan sessions increases.  I suppose you 
can assume that keys should increase because of ACCUMULO-1527.
                
> continueScan should never go backwards
> --------------------------------------
>
>                 Key: ACCUMULO-1582
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1582
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>            Reporter: Eric Newton
>
> Due to complex key transformations, a scanner kept handing the same start key 
> to continueScan. The tablet server should detect this and fail.

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