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https://issues.apache.org/jira/browse/HADOOP-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989810#comment-15989810
 ] 

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 
19s{color} | {color:blue} Docker mode activated. {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:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
25s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  5m 
43s{color} | {color:green} branch-2.7 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  5m 
15s{color} | {color:green} branch-2.7 passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 
11s{color} | {color:green} branch-2.7 passed with JDK v1.7.0_121 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
19s{color} | {color:green} branch-2.7 passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  8m 
10s{color} | {color:green} branch-2.7 passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  1m 
25s{color} | {color:green} branch-2.7 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} 
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| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  1m 
33s{color} | {color:red} hadoop-common-project/hadoop-common in branch-2.7 has 
3 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  5m 
22s{color} | {color:green} branch-2.7 passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  8m  
0s{color} | {color:green} branch-2.7 passed with JDK v1.7.0_121 {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
13s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  6m 
44s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  5m 
27s{color} | {color:green} the patch passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  5m 
27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 
14s{color} | {color:green} the patch passed with JDK v1.7.0_121 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  6m 
14s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  8m  
6s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
43s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  
1s{color} | {color:red} The patch has 6104 line(s) that end in whitespace. Use 
git apply --whitespace=fix <<patch_file>>. Refer 
https://git-scm.com/docs/git-apply {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  3m 
13s{color} | {color:red} The patch 70 line(s) with tabs. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Skipped patched modules with no Java source: . {color} 
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| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
44s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  5m 
20s{color} | {color:green} the patch passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  7m 
54s{color} | {color:green} the patch passed with JDK v1.7.0_121 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 25m 27s{color} 
| {color:red} root in the patch failed with JDK v1.7.0_121. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 
22s{color} | {color:red} The patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}143m 52s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| JDK v1.8.0_131 Failed junit tests | hadoop.util.bloom.TestBloomFilters |
| JDK v1.8.0_131 Timed out junit tests | 
org.apache.hadoop.conf.TestConfiguration |
| JDK v1.7.0_121 Failed junit tests | hadoop.util.bloom.TestBloomFilters |
| JDK v1.7.0_121 Timed out junit tests | 
org.apache.hadoop.conf.TestConfiguration |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:c420dfe |
| JIRA Issue | HADOOP-14313 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12865661/HADOOP-14313.branch-2.7.002.patch
 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux b2f327b05cab 3.13.0-106-generic #153-Ubuntu SMP Tue Dec 6 
15:44:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | branch-2.7 / 8ad9efb |
| Default Java | 1.7.0_121 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_131 
/usr/lib/jvm/java-7-openjdk-amd64:1.7.0_121 |
| findbugs | v3.0.0 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12211/artifact/patchprocess/branch-findbugs-hadoop-common-project_hadoop-common-warnings.html
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12211/artifact/patchprocess/whitespace-eol.txt
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| whitespace | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12211/artifact/patchprocess/whitespace-tabs.txt
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| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12211/artifact/patchprocess/patch-unit-root-jdk1.7.0_121.txt
 |
| JDK v1.7.0_121  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12211/testReport/ |
| asflicense | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12211/artifact/patchprocess/patch-asflicense-problems.txt
 |
| modules | C: hadoop-common-project/hadoop-common . U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/12211/console |
| Powered by | Apache Yetus 0.5.0-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.branch-2.7.001.patch, 
> HADOOP-14313.branch-2.7.002.patch, HADOOP-14313.master.001.patch, 
> HADOOP-14313.master.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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