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https://issues.apache.org/jira/browse/HBASE-15451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15192455#comment-15192455
 ] 

Hadoop QA commented on HBASE-15451:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} patch {color} | {color:blue} 0m 0s 
{color} | {color:blue} The patch file was not named according to hbase's naming 
conventions. Please see 
https://yetus.apache.org/documentation/0.2.0/precommit-patchnames for 
instructions. {color} |
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green} 0m 
0s {color} | {color:green} Patch does not have any anti-patterns. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s 
{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 
0s {color} | {color:green} The patch appears to include 2 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 3m 
5s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 41s 
{color} | {color:green} master passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 32s 
{color} | {color:green} master passed with JDK v1.7.0_79 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 4m 
35s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
16s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 
50s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 27s 
{color} | {color:green} master passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 32s 
{color} | {color:green} master passed with JDK v1.7.0_79 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
41s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 37s 
{color} | {color:green} the patch passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 37s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 31s 
{color} | {color:green} the patch passed with JDK v1.7.0_79 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 31s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 4m 
8s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
15s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 
0s {color} | {color:green} Patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
24m 38s {color} | {color:green} Patch does not cause any errors with Hadoop 
2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.1 2.6.2 2.6.3 2.7.1. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 7s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 26s 
{color} | {color:green} the patch passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 32s 
{color} | {color:green} the patch passed with JDK v1.7.0_79 {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 89m 29s 
{color} | {color:green} hbase-server in the patch passed with JDK v1.8.0. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 88m 15s 
{color} | {color:green} hbase-server in the patch passed with JDK v1.7.0_79. 
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
22s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 224m 23s {color} 
| {color:black} {color} |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12793194/HBASE-15451.test |
| JIRA Issue | HBASE-15451 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux asf907.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
 |
| git revision | master / b6b9910 |
| Default Java | 1.7.0_79 |
| Multi-JDK versions |  /home/jenkins/tools/java/jdk1.8.0:1.8.0 
/usr/local/jenkins/java/jdk1.7.0_79:1.7.0_79 |
| findbugs | v3.0.0 |
| JDK v1.7.0_79  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/949/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/949/console |
| Powered by | Apache Yetus 0.2.0   http://yetus.apache.org |


This message was automatically generated.



> Remove unnecessary wait in MVCC
> -------------------------------
>
>                 Key: HBASE-15451
>                 URL: https://issues.apache.org/jira/browse/HBASE-15451
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0, 1.2.0
>            Reporter: Yu Li
>            Assignee: Yu Li
>         Attachments: HBASE-15451.patch, HBASE-15451.test
>
>
> Currently the return value of MVCC#complete indicates whether readPoint 
> already advanced over write number of the given WriteEntry:
> {code}
> return readPoint.get() >= writeEntry.getWriteNumber();
> {code}
> While in MVCC#checkAndWait we never take usage of this but always call 
> waitForRead which will acquire and release lock on {{readWaiters}} and cause 
> additional context switch. This JIRA will improve this logic and remove the 
> unnecessary wait. 



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