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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12751) Allow RowLock to be reader writer
Date Thu, 27 Aug 2015 16:41:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14717019#comment-14717019
] 

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/12752796/12751v23.txt
  against master branch at commit 8f95318f6252c1c0b7a073619525eae6d991f47b.
  ATTACHMENT ID: 12752796

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

    {color:green}+1 tests included{color}.  The patch appears to include 84 new or modified
tests.

		    {color:red}-1 Anti-pattern{color}.  The patch appears to have anti-pattern where BYTES_COMPARATOR
was omitted:
             -        getRegionInfo(), -1, new TreeMap<byte[], List<Path>>());.

    {color:red}-1 javac{color}.  The patch appears to cause mvn compile goal to fail with
Hadoop version 2.4.0.

    Compilation errors resume:
    [ERROR] Error invoking method 'get(java.lang.Integer)' in java.util.ArrayList at META-INF/LICENSE.vm[line
1619, column 22]
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-remote-resources-plugin:1.5:process
(default) on project hbase-assembly: Error rendering velocity resource. Error invoking method
'get(java.lang.Integer)' in java.util.ArrayList at META-INF/LICENSE.vm[line 1619, column 22]:
InvocationTargetException: Index: 0, Size: 0 -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following
articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :hbase-assembly
    

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/15297//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: 12751v22.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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