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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9754) Eliminate threadlocal from MVCC code
Date Sat, 19 Apr 2014 07:11:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974762#comment-13974762

Jeffrey Zhong commented on HBASE-9754:

Thanks [~saint.ack@gmail.com] for looking this! You're so quick. Actually I was just asking
the possibility of back porting this JIRA but you already have the patch. 
 I'm not a fan of backporting this. Could we do something narrower to get you what you need
I agree. At least this is needed when I looked at the issue last time. Let me run some tests
early next week with your addendum patch and get back to you. Thanks.

> 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, 0.99.0
>         Attachments: 9754-0.94-v2.txt, 9754-0.94.txt, 9754-addendum.txt, 9754-rp-0.txt,
9754-rp-1.txt, 9754-rp-hregion-v2.txt, 9754-rp-hregion-v3.txt, 9754-rp-hregion.txt, 9754_plus_addendum_096.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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