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https://issues.apache.org/jira/browse/YARN-8569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16609755#comment-16609755
 ] 

Hadoop QA commented on YARN-8569:
---------------------------------

| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
25s{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 4 new or modified test 
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
13s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 17m 
33s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  9m  
1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 9s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
21s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
14m 12s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Skipped patched modules with no Java source: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m  
1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
43s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
12s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  8m 
52s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  8m 
52s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  8m 
52s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
1m 17s{color} | {color:orange} hadoop-yarn-project/hadoop-yarn: The patch 
generated 4 new + 147 unchanged - 1 fixed = 151 total (was 148) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
17s{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 10s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Skipped patched modules with no Java source: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m 
23s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
48s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
49s{color} | {color:green} hadoop-yarn-api in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 18m 
58s{color} | {color:green} hadoop-yarn-server-nodemanager in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 12m 
25s{color} | {color:green} hadoop-yarn-services-core in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
16s{color} | {color:green} hadoop-yarn-site in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
29s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}112m  1s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:ba1ab08 |
| JIRA Issue | YARN-8569 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12939132/YARN-8569.008.patch |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  cc  |
| uname | Linux 63306dfe7683 4.4.0-133-generic #159-Ubuntu SMP Fri Aug 10 
07:31:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 8fe4062 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.0-RC1 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-YARN-Build/21799/artifact/out/diff-checkstyle-hadoop-yarn-project_hadoop-yarn.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/21799/testReport/ |
| Max. process+thread count | 758 (vs. ulimit of 10000) |
| modules | C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core
 hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site U: 
hadoop-yarn-project/hadoop-yarn |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/21799/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Create an interface to provide cluster information to application
> -----------------------------------------------------------------
>
>                 Key: YARN-8569
>                 URL: https://issues.apache.org/jira/browse/YARN-8569
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>            Priority: Major
>              Labels: Docker
>         Attachments: YARN-8569 YARN sysfs interface to provide cluster 
> information to application.pdf, YARN-8569.001.patch, YARN-8569.002.patch, 
> YARN-8569.003.patch, YARN-8569.004.patch, YARN-8569.005.patch, 
> YARN-8569.006.patch, YARN-8569.007.patch, YARN-8569.008.patch
>
>
> Some program requires container hostnames to be known for application to run. 
>  For example, distributed tensorflow requires launch_command that looks like:
> {code}
> # On ps0.example.com:
> $ python trainer.py \
>      --ps_hosts=ps0.example.com:2222,ps1.example.com:2222 \
>      --worker_hosts=worker0.example.com:2222,worker1.example.com:2222 \
>      --job_name=ps --task_index=0
> # On ps1.example.com:
> $ python trainer.py \
>      --ps_hosts=ps0.example.com:2222,ps1.example.com:2222 \
>      --worker_hosts=worker0.example.com:2222,worker1.example.com:2222 \
>      --job_name=ps --task_index=1
> # On worker0.example.com:
> $ python trainer.py \
>      --ps_hosts=ps0.example.com:2222,ps1.example.com:2222 \
>      --worker_hosts=worker0.example.com:2222,worker1.example.com:2222 \
>      --job_name=worker --task_index=0
> # On worker1.example.com:
> $ python trainer.py \
>      --ps_hosts=ps0.example.com:2222,ps1.example.com:2222 \
>      --worker_hosts=worker0.example.com:2222,worker1.example.com:2222 \
>      --job_name=worker --task_index=1
> {code}
> This is a bit cumbersome to orchestrate via Distributed Shell, or YARN 
> services launch_command.  In addition, the dynamic parameters do not work 
> with YARN flex command.  This is the classic pain point for application 
> developer attempt to automate system environment settings as parameter to end 
> user application.
> It would be great if YARN Docker integration can provide a simple option to 
> expose hostnames of the yarn service via a mounted file.  The file content 
> gets updated when flex command is performed.  This allows application 
> developer to consume system environment settings via a standard interface.  
> It is like /proc/devices for Linux, but for Hadoop.  This may involve 
> updating a file in distributed cache, and allow mounting of the file via 
> container-executor.



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