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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9754) Eliminate threadlocal from MVCC code
Date Sun, 20 Oct 2013 05:27:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13800084#comment-13800084
] 

stack commented on HBASE-9754:
------------------------------

On 0.96, looks good but are there numbers on the improvement?  If nothing definitive, lets
hold off (This is the new 'Stack', the one that only wants bug fixes and definite perf improvement
committed to 0.96; let the new stuff happen in the next release, 0.98).

> Eliminate threadlocal from MVCC code
> ------------------------------------
>
>                 Key: HBASE-9754
>                 URL: https://issues.apache.org/jira/browse/HBASE-9754
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Ted Yu
>             Fix For: 0.98.0
>
>         Attachments: 9754-0.94.txt, 9754-0.94-v2.txt, 9754-rp-0.txt, 9754-rp-1.txt, 9754-rp-hregion.txt,
9754-rp-hregion-v2.txt, 9754-rp-hregion-v3.txt
>
>
> Brought up by [~vrodionov] and [~yuzhihong@gmail.com].
> Currently we use ThreadLocals to communicate the current readpoint between a RegionScanner
and the Store\{File}Scanner's down the stack.
> Since ThreadLocals are not cheap we should consider whether it is possible to pass the
readpoint through the call stack instead.



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