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https://issues.apache.org/jira/browse/HADOOP-9749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15864567#comment-15864567
 ] 

Hadoop QA commented on HADOOP-9749:
-----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 13m 
34s{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:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  6m 
40s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  5m 
31s{color} | {color:green} branch-2 passed with JDK v1.8.0_121 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 
30s{color} | {color:green} branch-2 passed with JDK v1.7.0_121 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
28s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
58s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
16s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
39s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
45s{color} | {color:green} branch-2 passed with JDK v1.8.0_121 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
57s{color} | {color:green} branch-2 passed with JDK v1.7.0_121 {color} |
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red}  0m 
35s{color} | {color:red} hadoop-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  5m 
27s{color} | {color:green} the patch passed with JDK v1.8.0_121 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  5m 
27s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red}  0m 
57s{color} | {color:red} root in the patch failed with JDK v1.7.0_121. {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  0m 57s{color} 
| {color:red} root in the patch failed with JDK v1.7.0_121. {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 27s{color} | {color:orange} hadoop-common-project/hadoop-common: The patch 
generated 7 new + 140 unchanged - 4 fixed = 147 total (was 144) {color} |
| {color:red}-1{color} | {color:red} mvnsite {color} | {color:red}  0m 
42s{color} | {color:red} hadoop-common in the patch failed. {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} The patch has no whitespace issues. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  0m 
28s{color} | {color:red} hadoop-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
44s{color} | {color:green} the patch passed with JDK v1.8.0_121 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
57s{color} | {color:green} the patch passed with JDK v1.7.0_121 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  0m 44s{color} 
| {color:red} hadoop-common in the patch failed with JDK v1.7.0_121. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
21s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 67m 54s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| JDK v1.8.0_121 Timed out junit tests | 
org.apache.hadoop.http.TestHttpServerLifecycle |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:b59b8b7 |
| JIRA Issue | HADOOP-9749 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12852419/HADOOP-9749.branch-2.patch
 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux bb28b03b6fd8 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 / 30ff5bf |
| Default Java | 1.7.0_121 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_121 
/usr/lib/jvm/java-7-openjdk-amd64:1.7.0_121 |
| findbugs | v3.0.0 |
| mvninstall | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/artifact/patchprocess/patch-mvninstall-hadoop-common-project_hadoop-common.txt
 |
| compile | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/artifact/patchprocess/patch-compile-root-jdk1.7.0_121.txt
 |
| javac | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/artifact/patchprocess/patch-compile-root-jdk1.7.0_121.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/artifact/patchprocess/diff-checkstyle-hadoop-common-project_hadoop-common.txt
 |
| mvnsite | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/artifact/patchprocess/patch-mvnsite-hadoop-common-project_hadoop-common.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/artifact/patchprocess/patch-findbugs-hadoop-common-project_hadoop-common.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common-jdk1.7.0_121.txt
 |
| JDK v1.7.0_121  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/testReport/ |
| modules | C: hadoop-common-project/hadoop-common U: 
hadoop-common-project/hadoop-common |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/11617/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Remove synchronization for UGI.getCurrentUser
> ---------------------------------------------
>
>                 Key: HADOOP-9749
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9749
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: security
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0-alpha1
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HADOOP-9749.branch-2.patch, HADOOP-9749.trunk.patch
>
>
> HADOOP-7854 added synchronization to {{getCurrentUser}} due to 
> {{ConcurrentModificationExceptions}}.  This degrades NN call handler 
> performance.
> The problem was not well understood at the time, but it's caused by a 
> collision between relogin and {{getCurrentUser}} due to a bug in 
> {{Krb5LoginModule}}.  Avoiding the collision will allow removal of the 
> synchronization.



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