You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2013/10/12 06:58:42 UTC

[jira] [Assigned] (HBASE-9751) Excessive readpoints checks in MemStoreScanner and StoreFileScanner

     [ https://issues.apache.org/jira/browse/HBASE-9751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl reassigned HBASE-9751:
------------------------------------

    Assignee: Lars Hofhansl

> Excessive  readpoints checks in MemStoreScanner and StoreFileScanner
> --------------------------------------------------------------------
>
>                 Key: HBASE-9751
>                 URL: https://issues.apache.org/jira/browse/HBASE-9751
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0, 0.94.12, 0.96.0
>            Reporter: Vladimir Rodionov
>            Assignee: Lars Hofhansl
>
> It seems that usage of skipKVsNewerThanReadpoint in StoreFileScanner can be greatly reduced or even eliminated all together (HFiles are immutable and no new KVs can be inserted after scanner instance is created). The same is true for MemStoreScanner which checks readpoint on every next() and seek(). Each readpoint check is ThreadLocal.get() and it is quite expensive.  



--
This message was sent by Atlassian JIRA
(v6.1#6144)