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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14268) Improve KeyLocker
Date Thu, 27 Aug 2015 03:31:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14716012#comment-14716012
] 

Hadoop QA commented on HBASE-14268:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12752646/HBASE-14268-V6.patch
  against master branch at commit 56890d9fe148dd192520fab349a66aa3f688e232.
  ATTACHMENT ID: 12752646

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

    {color:green}+1 tests included{color}.  The patch appears to include 5 new or modified
tests.

    {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/15283//console

This message is automatically generated.

> Improve KeyLocker
> -----------------
>
>                 Key: HBASE-14268
>                 URL: https://issues.apache.org/jira/browse/HBASE-14268
>             Project: HBase
>          Issue Type: Improvement
>          Components: util
>            Reporter: Hiroshi Ikeda
>            Assignee: Hiroshi Ikeda
>            Priority: Minor
>         Attachments: 14268-V5.patch, HBASE-14268-V2.patch, HBASE-14268-V3.patch, HBASE-14268-V4.patch,
HBASE-14268-V5.patch, HBASE-14268-V5.patch, HBASE-14268-V6.patch, HBASE-14268.patch, KeyLockerPerformance.java
>
>
> 1. In the implementation of {{KeyLocker}} it uses atomic variables inside a synchronized
block, which doesn't make sense. Moreover, logic inside the synchronized block is not trivial
so that it makes less performance in heavy multi-threaded environment.
> 2. {{KeyLocker}} gives an instance of {{RentrantLock}} which is already locked, but it
doesn't follow the contract of {{ReentrantLock}} because you are not allowed to freely invoke
lock/unlock methods under that contract. That introduces a potential risk; Whenever you see
a variable of the type {{RentrantLock}}, you should pay attention to what the included instance
is coming from.



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