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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2014/12/28 03:47:13 UTC

[jira] [Commented] (HBASE-12751) Allow RowLock to be reader writer

    [ https://issues.apache.org/jira/browse/HBASE-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14259554#comment-14259554 ] 

Lars Hofhansl commented on HBASE-12751:
---------------------------------------

Interesting. Are you saying we do not need the rowlock at all?

> 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
>
> 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.



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