[jira] [Commented] (ACCUMULO-625) consider augmenting session state with "breadcrumbs"

["Keith Turner (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ACCUMULO-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13633015#comment-13633015 ] 

Keith Turner commented on ACCUMULO-625:
---------------------------------------

I thought someone had create a ticket to add a close method to iterators, but I did not find it.  I was thinking this would be a natural place to return state that is sent back to the client.
                
> 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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