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https://issues.apache.org/jira/browse/HBASE-14549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14942867#comment-14942867
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Lars Hofhansl commented on HBASE-14549:
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See HBASE-5121 (and my _own_ suggestion to simplify fix there :) ).
> 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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