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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12751) Allow RowLock to be reader writer
Date Sat, 12 Sep 2015 05:49:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741913#comment-14741913
] 

Hadoop QA commented on HBASE-12751:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12755538/12751.rebased.v35.txt
  against master branch at commit 36675c81fb2803418191e44c7eb9560a92a23411.
  ATTACHMENT ID: 12755538

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 99 new or modified
tests.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/15571//console

This message is automatically generated.

> 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: 12751.rebased.v25.txt, 12751.rebased.v26.txt, 12751.rebased.v26.txt,
12751.rebased.v27.txt, 12751.rebased.v29.txt, 12751.rebased.v31.txt, 12751.rebased.v32.txt,
12751.rebased.v32.txt, 12751.rebased.v33.txt, 12751.rebased.v34.txt, 12751.rebased.v35.txt,
12751.rebased.v35.txt, 12751.rebased.v35.txt, 12751v22.txt, 12751v23.txt, 12751v23.txt, 12751v23.txt,
12751v23.txt, 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-v16.patch, HBASE-12751-v17.patch, HBASE-12751-v18.patch, HBASE-12751-v19 (1).patch,
HBASE-12751-v19.patch, HBASE-12751-v2.patch, HBASE-12751-v20.patch, HBASE-12751-v20.patch,
HBASE-12751-v21.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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