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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12751) Allow RowLock to be reader writer
Date Wed, 22 Jul 2015 20:23:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14637558#comment-14637558
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Elliott Clark commented on HBASE-12751:
---------------------------------------

Do we want to make the locking fair? or should normal puts be able to starve check and mutates?
Fairness will increase the size of the read write lock. However it will keep things from starving.

> 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
>    Affects Versions: 2.0.0, 1.3.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: HBASE-12751-v1.patch, HBASE-12751-v10.patch, HBASE-12751-v10.patch,
HBASE-12751-v11.patch, HBASE-12751-v12.patch, HBASE-12751-v13.patch, HBASE-12751-v14.patch,
HBASE-12751-v15.patch, HBASE-12751-v2.patch, HBASE-12751-v3.patch, HBASE-12751-v4.patch, HBASE-12751-v5.patch,
HBASE-12751-v6.patch, HBASE-12751-v7.patch, HBASE-12751-v8.patch, HBASE-12751-v9.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.



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