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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14549) Simplify scanner stack reset logic
Date Sun, 04 Oct 2015 22:04:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14942825#comment-14942825
] 

Lars Hofhansl commented on HBASE-14549:
---------------------------------------

There is a slight performance improvement too.

> Simplify scanner stack reset logic
> ----------------------------------
>
>                 Key: HBASE-14549
>                 URL: https://issues.apache.org/jira/browse/HBASE-14549
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>         Attachments: 14549-0.98.txt
>
>
> Looking at the code, I find that the logic is unnecessarily complex.
> We indicate in updateReaders that the scanner stack needs to be reset. Then almost all
store scanner (and derived classes) methods need to check and actually reset the scanner stack.
> Compaction are rare, we should reset the scanner stack in update readers, and hence avoid
needing to check in all methods.
> Patch forthcoming.



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