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https://issues.apache.org/jira/browse/ACCUMULO-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13548828#comment-13548828
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Keith Turner commented on ACCUMULO-625:
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I think the batch scanner could support isolation. It would need to be
refactored such that you could handle isolation exceptions on a per tablet
server basis and retry just for that tablet server.
> consider augmenting session state with "breadcrumbs"
> ----------------------------------------------------
>
> Key: ACCUMULO-625
> URL: https://issues.apache.org/jira/browse/ACCUMULO-625
> Project: Accumulo
> Issue Type: Improvement
> Components: tserver
> Reporter: Eric Newton
> Assignee: Keith Turner
>
> Presently, the iterator stack can be created and destroyed at the whim of the
> tserver and its buffering needs. In complex iterations, lower-level
> iterators can make significant progress which is not inherently obvious in
> any returned key. When the iterator stack is re-created to continue a query,
> the last key returned is used to {{seek()}} the iterators. Lower-level
> iterators must re-scan their data to move back to the old position.
> Consider a mechanism to save progress beyond the last key returned.
>
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