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https://issues.apache.org/jira/browse/HDFS-10336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15353183#comment-15353183
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Hadoop QA commented on HDFS-10336:
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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 
29s{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} 10m 
 1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
5s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
39s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
14s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
15s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
59s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
4s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
 3s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
2s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  
2s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
10s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
12s{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} findbugs {color} | {color:green}  2m 
13s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
9s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 84m 38s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
30s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}110m 49s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | 
hadoop.hdfs.tools.offlineEditsViewer.TestOfflineEditsViewer |
|   | hadoop.hdfs.server.namenode.TestFsck |
|   | hadoop.hdfs.TestCrcCorruption |
|   | hadoop.hdfs.server.datanode.TestDataNodeVolumeFailure |
|   | hadoop.hdfs.server.namenode.TestEditLog |
|   | hadoop.hdfs.server.datanode.TestDataNodeHotSwapVolumes |
|   | hadoop.hdfs.server.namenode.TestCacheDirectives |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:85209cc |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12814117/HDFS-10336.002.patch |
| JIRA Issue | HDFS-10336 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux 394be24a9414 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 | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / 23c3ff8 |
| Default Java | 1.8.0_91 |
| findbugs | v3.0.0 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/15933/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/15933/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/15933/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> TestBalancer failing intermittently because of not reseting 
> UserGroupInformation completely
> -------------------------------------------------------------------------------------------
>
>                 Key: HDFS-10336
>                 URL: https://issues.apache.org/jira/browse/HDFS-10336
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: HDFS-10336.001.patch, HDFS-10336.002.patch
>
>
> The unit test {{TestBalancer}} failed sometimes. 
> I looked for the reason. I found two main reasons causing this.
> * 1st. The test {{TestBalancer#testBalancerWithKeytabs}} executed timeout.
> {code}
> org.apache.hadoop.hdfs.server.balancer.TestBalancer
> testBalancerWithKeytabs(org.apache.hadoop.hdfs.server.balancer.TestBalancer)  
> Time elapsed: 300.41 sec  <<< ERROR!
> java.lang.Exception: test timed out after 300000 milliseconds
>       at java.lang.Thread.sleep(Native Method)
>       at 
> org.apache.hadoop.hdfs.server.balancer.Dispatcher.waitForMoveCompletion(Dispatcher.java:1122)
>       at 
> org.apache.hadoop.hdfs.server.balancer.Dispatcher.dispatchBlockMoves(Dispatcher.java:1096)
>       at 
> org.apache.hadoop.hdfs.server.balancer.Dispatcher.dispatchAndCheckContinue(Dispatcher.java:1060)
>       at 
> org.apache.hadoop.hdfs.server.balancer.Balancer.runOneIteration(Balancer.java:635)
>       at 
> org.apache.hadoop.hdfs.server.balancer.Balancer.run(Balancer.java:689)
>       at 
> org.apache.hadoop.hdfs.server.balancer.TestBalancer.testUnknownDatanode(TestBalancer.java:1098)
>       at 
> org.apache.hadoop.hdfs.server.balancer.TestBalancer.access$000(TestBalancer.java:125)
> {code}
> * 2nd. The test {{TestBalancer#testBalancerWithKeytabs}} reset the {{UGI}} 
> not completely sometimes in the finally block. And this affected the other 
> unit tests threw {{IOException}}, like this:
> {code}
> testBalancerWithNonZeroThreadsForMove(org.apache.hadoop.hdfs.server.balancer.TestBalancer)
>   Time elapsed: 0 sec  <<< ERROR!
> java.io.IOException: Running in secure mode, but config doesn't have a keytab
>       at org.apache.hadoop.security.SecurityUtil.login(SecurityUtil.java:300)
> {code}
> And there were not only one test will be affected by this. We should add a 
> line to do before doing reset {{UGI}} operation and can avoid the potenial 
> exception happens.
> {code}
> UserGroupInformation.reset();
> {code}



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