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https://issues.apache.org/jira/browse/HBASE-12839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14274128#comment-14274128
 ] 

Hadoop QA commented on HBASE-12839:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12691713/HBASE-12839.patch
  against master branch at commit e52d8f85c48adc772dfe99e1f5cebb814e89c16c.
  ATTACHMENT ID: 12691713

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include 
any new or modified tests.
                        Please justify why no new tests are needed for this 
patch.
                        Also please list what manual steps were performed to 
verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any 
warning messages.

                {color:red}-1 checkstyle{color}.  The applied patch generated 
2074 checkstyle errors (more than the master's current 2073 errors).

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines 
longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
     

Test results: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//testReport/
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Checkstyle Errors: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//artifact/patchprocess/checkstyle-aggregate.html

                Console output: 
https://builds.apache.org/job/PreCommit-HBASE-Build/12424//console

This message is automatically generated.

> Remove synchronization in ServerStatisticsTracker
> -------------------------------------------------
>
>                 Key: HBASE-12839
>                 URL: https://issues.apache.org/jira/browse/HBASE-12839
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: HBASE-12839.patch
>
>
> Remove synchronization in ServerStatisticTracker. We can use putIfAbsent 
> instead of a synchronized block to add ServerStatistic objects to the 
> concurrent statistics hashmap. 



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