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https://issues.apache.org/jira/browse/HBASE-18251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16092993#comment-16092993
 ] 

Hadoop QA commented on HBASE-18251:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
16s{color} | {color:blue} Docker mode activated. {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:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  
0s{color} | {color:red} 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} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
33s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
43s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
49s{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:red}-1{color} | {color:red} findbugs {color} | {color:red}  2m 
53s{color} | {color:red} hbase-server in master has 9 extant Findbugs warnings. 
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
30s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
41s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
41s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
50s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
16s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
30m 46s{color} | {color:green} Patch does not cause any errors with Hadoop 
2.6.1 2.6.2 2.6.3 2.6.4 2.6.5 2.7.1 2.7.2 2.7.3 or 3.0.0-alpha4. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m  
3s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
31s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}120m  
6s{color} | {color:green} hbase-server in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
17s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}166m 37s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.12.3 Server=1.12.3 Image:yetus/hbase:757bf37 |
| JIRA Issue | HBASE-18251 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12877950/HBASE-18251-v2.patch |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux 8c6c2a5021c8 3.13.0-119-generic #166-Ubuntu SMP Wed May 3 
12:18:55 UTC 2017 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 / 6b7ebc0 |
| Default Java | 1.8.0_131 |
| findbugs | v3.1.0-RC3 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7711/artifact/patchprocess/branch-findbugs-hbase-server-warnings.html
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7711/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7711/console |
| Powered by | Apache Yetus 0.4.0   http://yetus.apache.org |


This message was automatically generated.



> Remove unnecessary traversing to the first and last keys in the CellSet
> -----------------------------------------------------------------------
>
>                 Key: HBASE-18251
>                 URL: https://issues.apache.org/jira/browse/HBASE-18251
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Anastasia Braginsky
>            Assignee: Toshihiro Suzuki
>         Attachments: HBASE-18251.patch, HBASE-18251-v2.patch
>
>
> The implementation of finding the first and last keys in the CellSet is as 
> following:
> {code}
>  public Cell first() {
>     return this.delegatee.get(this.delegatee.firstKey());
>   }
>   public Cell last() {
>     return this.delegatee.get(this.delegatee.lastKey());
>   }
> {code}
> Recall we have Cell to Cell mapping, therefore the methods bringing the 
> first/last key, which allready return Cell. Thus no need to waist time on the 
> get() method for the same Cell.
> Fix: return just the first/lastKey(), should be at least twice more effective.



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