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https://issues.apache.org/jira/browse/MAPREDUCE-7310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17240412#comment-17240412
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Hadoop QA commented on MAPREDUCE-7310:
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|| Vote || Subsystem || Runtime ||  Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
49s{color} | {color:blue}{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} || ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green}  0m  
0s{color} | {color:green}{color} | {color:green} No case conflicting files 
found. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green}{color} | {color:green} The patch does not contain any 
@author tags. {color} |
| {color:green}+1{color} | {color:green} {color} | {color:green}  0m  0s{color} 
| {color:green}test4tests{color} | {color:green} The patch appears to include 1 
new or modified test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m 
26s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
36s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
30s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
25s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
34s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m 24s{color} | {color:green}{color} | {color:green} branch has no errors when 
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
40s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
26s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  0m 
58s{color} | {color:blue}{color} | {color:blue} Used deprecated FindBugs 
config; considering switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 
56s{color} | {color:green}{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
34s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
30s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
30s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
26s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
26s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
23s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
30s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green}{color} | {color:green} The patch has no whitespace 
issues. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
14m 39s{color} | {color:green}{color} | {color:green} patch has no errors when 
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
25s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
24s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m  
5s{color} | {color:green}{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} || ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  8m 
36s{color} | {color:green}{color} | {color:green} hadoop-mapreduce-client-app 
in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
34s{color} | {color:green}{color} | {color:green} The patch does not generate 
ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 70m 59s{color} | 
{color:black}{color} | {color:black}{color} |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base: 
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/47/artifact/out/Dockerfile
 |
| JIRA Issue | MAPREDUCE-7310 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13016188/MAPREDUCE-7310.001.patch
 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle |
| uname | Linux 224b4ef8ae0c 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 68442b48c8a |
| Default Java | Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
|  Test Results | 
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/47/testReport/ |
| Max. process+thread count | 718 (vs. ulimit of 5500) |
| modules | C: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app U: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app |
| Console output | 
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/47/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=4.0.6 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |


This message was automatically generated.



> Fix flaky test TestJobHistoryEventHandler.testSigTermedFunctionality
> --------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7310
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7310
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Zhengxi Li
>            Priority: Minor
>         Attachments: MAPREDUCE-7310.001.patch
>
>
> The test 
> '{{org.apache.hadoop.mapreduce.jobhistory.TestJobHistoryEventHandler.testSigTermedFunctionality'}}
>  is not idempotent and fails if run twice in the same JVM, because it 
> pollutes state shared among tests. It may be good to clean this state 
> pollution so that some other tests do not fail in the future due to the 
> shared state polluted by this test.
> h3. Details
> Running `TestJobHistoryEventHandler.testSigTermedFunctionality` twice would 
> result in the second run failing due to `NullPointerException`shown in the 
> following:
> {noformat}
>  java.lang.NullPointerException
>  at 
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.serviceStop(JobHistoryEventHandler.java:460)
>  at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
>  at 
> org.apache.hadoop.mapreduce.jobhistory.TestJobHistoryEventHandler.testSigTermedFunctionality(TestJobHistoryEventHandler.java:933)
> {noformat}
> The root cause of this is that running 
> '{{TestJobHistoryEventHandler.testSigTermedFunctionality'}} results in some 
> entries to be added to the static '{{JobHistoryEventHandler.fileMap'}}. The 
> entries in the '{{fileMap'}} are not cleaned up when the test is done, 
> resulting in a NullPointerException in the second run as the stale 
> object(added in the first run) in the 'fileMap' is accessed.
>  
> PR link: https://github.com/apache/hadoop/pull/2499



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