hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12751) Allow RowLock to be reader writer
Date Tue, 07 Apr 2015 09:28:13 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Elliott Clark updated HBASE-12751:
----------------------------------
    Attachment: HBASE-12751-v2.patch

Latest patch on phabricator. This will likely fail most tests.

Just putting this up to show some progress and get some early feedback. It removes on atomic
long, and one allocation on every write so it should be a win (testing needed here).

> Allow RowLock to be reader writer
> ---------------------------------
>
>                 Key: HBASE-12751
>                 URL: https://issues.apache.org/jira/browse/HBASE-12751
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>         Attachments: HBASE-12751-v1.patch, HBASE-12751-v2.patch, HBASE-12751.patch
>
>
> Right now every write operation grabs a row lock. This is to prevent values from changing
during a read modify write operation (increment or check and put). However it limits parallelism
in several different scenarios.
> If there are several puts to the same row but different columns or stores then this is
very limiting.
> If there are puts to the same column then mvcc number should ensure a consistent ordering.
So locking is not needed.
> However locking for check and put or increment is still needed.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message