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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9754) Consider eliminating threadlocals from MVCC code
Date Wed, 16 Oct 2013 14:01:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13796811#comment-13796811
] 

Ted Yu commented on HBASE-9754:
-------------------------------

In ZooKeeperScanPolicyObserver#preCompactScannerOpen(), currently store.getSmallestReadPoint()
is passed.
My change is in accordance with existing code.

> Consider eliminating threadlocals 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-rp-0.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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