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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5285) Optimize upper / lower byte range for key range scan on windowed stores
Date Thu, 15 Feb 2018 22:11:02 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16366331#comment-16366331
] 

ASF GitHub Bot commented on KAFKA-5285:
---------------------------------------

guozhangwang opened a new pull request #4576: KAFKA-5285: Use optimized upper and lower bound
for window key schema [WIP]
URL: https://github.com/apache/kafka/pull/4576
 
 
   *More detailed description of your change,
   if necessary. The PR title and PR message become
   the squashed commit message, so use a separate
   comment to ping reviewers.*
   
   *Summary of testing strategy (including rationale)
   for the feature or bug fix. Unit and/or integration
   tests are expected for any behaviour change and
   system tests should be considered for larger changes.*
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
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> Optimize upper / lower byte range for key range scan on windowed stores
> -----------------------------------------------------------------------
>
>                 Key: KAFKA-5285
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5285
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Xavier Léauté
>            Assignee: Xavier Léauté
>            Priority: Major
>              Labels: performance
>
> The current implementation of {{WindowKeySchema}} / {{SessionKeySchema}} {{upperRange}}
and {{lowerRange}} does not make any assumptions with respect to the other key bound (e.g.
the upper byte bound does not depends on lower key bound).
> It should be possible to optimize the byte range somewhat further using the information
provided by the lower bound.
> More specifically, by incorporating that information, we should be able to eliminate
the corresponding {{upperRangeFixedSize}} and {{lowerRangeFixedSize}}, since the result should
be the same if we implement that optimization.



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