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https://issues.apache.org/jira/browse/YARN-9667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16900225#comment-16900225
 ] 

Hadoop QA commented on YARN-9667:
---------------------------------

| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
21s{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: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:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 19m 
20s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
3s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
40s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
31m 43s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
35s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
6s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  1m  
6s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  
6s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
37s{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} shadedclient {color} | {color:green} 
11m 52s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 21m 
12s{color} | {color:green} hadoop-yarn-server-nodemanager in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
41s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 68m 47s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.1 Server=19.03.1 Image:yetus/hadoop:bdbca0e |
| JIRA Issue | YARN-9667 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12976707/YARN-9667-001.patch |
| Optional Tests |  dupname  asflicense  compile  cc  mvnsite  javac  unit  |
| uname | Linux 1e7d18c37fb5 4.4.0-138-generic #164-Ubuntu SMP Tue Oct 2 
17:16:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 71aad60 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_212 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/24470/testReport/ |
| Max. process+thread count | 446 (vs. ulimit of 10000) |
| modules | C: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 U: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/24470/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Container-executor.c duplicates messages to stdout
> --------------------------------------------------
>
>                 Key: YARN-9667
>                 URL: https://issues.apache.org/jira/browse/YARN-9667
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager, yarn
>    Affects Versions: 3.2.0
>            Reporter: Adam Antal
>            Assignee: Peter Bacsko
>            Priority: Major
>         Attachments: YARN-9667-001.patch
>
>
> When a container is killed by its AM we get a similar error message like this:
> {noformat}
> 2019-06-30 12:09:04,412 WARN 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.privileged.PrivilegedOperationExecutor:
>  Shell execution returned exit code: 143. Privileged Execution Operation 
> Stderr:
> Stdout: main : command provided 1
> main : run as user is systest
> main : requested yarn user is systest
> Getting exit code file...
> Creating script paths...
> Writing pid file...
> Writing to tmp file 
> /yarn/nm/nmPrivate/application_1561921629886_0001/container_e84_1561921629886_0001_01_000019/container_e84_1561921629886_0001_01_000019.pid.tmp
> Writing to cgroup task files...
> Creating local dirs...
> Launching container...
> Getting exit code file...
> Creating script paths...
> {noformat}
> In container-executor.c the fork point is right after the "Creating script 
> paths..." part, though in the Stdout log we can clearly see it has been 
> written there twice. After consulting with [~pbacsko] it seems like there's a 
> missing flush in container-executor.c before the fork and that causes the 
> duplication.
> I suggest to add a flush there so that it won't be duplicated: it's a bit 
> misleading that the child process writes out "Getting exit code file" and 
> "Creating script paths" even though it is clearly not doing that.
> A more appealing solution could be to revisit the fprintf-fflush pairs in the 
> code and change them to a single call, so that the fflush calls would not be 
> forgotten accidentally. (It can cause problems in every place where it's 
> used).
> Note: this issue probably affects every occasion of fork(), not just the one 
> from {{launch_container_as_user}} in {{main.c}}.



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