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https://issues.apache.org/jira/browse/HADOOP-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16104363#comment-16104363
 ] 

Hadoop QA commented on HADOOP-14313:
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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 
24s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  1m 
21s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 13m 
28s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 14m  
2s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
 1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 11m 
45s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Skipped patched modules with no Java source: . {color} 
|
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
23s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  5m 
26s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
16s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 15m 
52s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 20m  
2s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 20m  
2s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
29s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 15m  
4s{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:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Skipped patched modules with no Java source: . {color} 
|
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 
11s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  6m 
44s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 21m 54s{color} 
| {color:red} root in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
52s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}155m 41s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.security.TestRaceWhenRelogin |
|   | hadoop.security.TestGroupsCaching |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:14b5c93 |
| JIRA Issue | HADOOP-14313 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12867062/HADOOP-14313.001.patch
 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux 97a6f86ef168 3.13.0-116-generic #163-Ubuntu SMP Fri Mar 31 
14:13:22 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / c6330f2 |
| Default Java | 1.8.0_131 |
| findbugs | v3.1.0-RC1 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12880/artifact/patchprocess/patch-unit-root.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12880/testReport/ |
| modules | C: hadoop-common-project/hadoop-common . U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12880/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Replace/improve Hadoop's byte[] comparator
> ------------------------------------------
>
>                 Key: HADOOP-14313
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14313
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: common
>    Affects Versions: 2.7.4
>            Reporter: Vikas Vishwakarma
>             Fix For: 2.7.4
>
>         Attachments: HADOOP-14313.001.patch, 
> HADOOP-14313.branch-2.7.001.patch, HADOOP-14313.branch-2.7.002.patch
>
>
> Hi,
> Recently we were looking at the Lexicographic byte array comparison in HBase. 
> We did microbenchmark for the byte array comparator of HADOOP ( 
> https://github.com/hanborq/hadoop/blob/master/src/core/org/apache/hadoop/io/FastByteComparisons.java#L161
>  ) , HBase Vs the latest byte array comparator from guava  ( 
> https://github.com/google/guava/blob/master/guava/src/com/google/common/primitives/UnsignedBytes.java#L362
>  ) and observed that the guava main branch version is much faster. 
> Specifically we see very good improvement when the byteArraySize%8 != 0 and 
> also for large byte arrays. I will update the benchmark results using JMH for 
> Hadoop vs Guava. For the jira on HBase, please refer HBASE-17877. 



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