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Posted to dev@accumulo.apache.org by "Eric Newton (JIRA)" <ji...@apache.org> on 2012/06/07 14:02:22 UTC
[jira] [Created] (ACCUMULO-625) consider augmenting session state
with "breadcrumbs"
Eric Newton created ACCUMULO-625:
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Summary: 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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[jira] [Commented] (ACCUMULO-625) consider augmenting session state
with "breadcrumbs"
Posted by "Keith Turner (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ACCUMULO-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291153#comment-13291153 ]
Keith Turner commented on ACCUMULO-625:
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One thing I have considered for making iterators more stateful is HTTP cookie like mechanism. Some state could be returned to clients. When a client continues a scan, it returns this state. One reason for doing this is making the handling across faults easier.
> 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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