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https://issues.apache.org/jira/browse/YARN-10421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17194282#comment-17194282
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Hadoop QA commented on YARN-10421:
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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}  1m 
18s{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} No case conflicting files found. {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}  1m 
10s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 21m 
53s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m 
29s{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m 
49s{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 2s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
24s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
15m 36s{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}  1m  
7s{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
2s{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  0m 
45s{color} | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 
31s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
29s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
16s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m 
19s{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  3m 
19s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m 
44s{color} | {color:green} the patch passed with JDK Private 
Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  2m 
44s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 57s{color} | {color:orange} 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server: The patch generated 2 new + 
16 unchanged - 0 fixed = 18 total (was 16) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
12s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} shellcheck {color} | {color:green}  0m 
 0s{color} | {color:green} There were no new shellcheck issues. {color} |
| {color:green}+1{color} | {color:green} shelldocs {color} | {color:green}  0m 
15s{color} | {color:green} The patch generated 0 new + 104 unchanged - 132 
fixed = 104 total (was 236) {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} shadedclient {color} | {color:red} 15m 
41s{color} | {color:red} patch has errors when building and testing our client 
artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
0s{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
55s{color} | {color:green} the patch passed with JDK Private 
Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 
41s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 92m 44s{color} 
| {color:red} hadoop-yarn-server-resourcemanager in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  2m 
36s{color} | {color:green} hadoop-yarn-server-router in the patch passed. 
{color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 
32s{color} | {color:red} The patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}182m  2s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | 
hadoop.yarn.server.resourcemanager.scheduler.fair.TestFairSchedulerPreemption |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base: 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/173/artifact/out/Dockerfile
 |
| JIRA Issue | YARN-10421 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13011396/YARN-10421.002.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle shellcheck shelldocs |
| uname | Linux 82622d07b065 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 
23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 89428f142fe |
| Default Java | Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 |
| checkstyle | 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/173/artifact/out/diff-checkstyle-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server.txt
 |
| unit | 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/173/artifact/out/patch-unit-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager.txt
 |
|  Test Results | 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/173/testReport/ |
| asflicense | 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/173/artifact/out/patch-asflicense-problems.txt
 |
| Max. process+thread count | 897 (vs. ulimit of 5500) |
| modules | C: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
 hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router 
U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server |
| Console output | 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/173/console |
| versions | git=2.17.1 maven=3.6.0 shellcheck=0.4.6 findbugs=4.0.6 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |


This message was automatically generated.



> Create YarnDiagnosticsService to serve diagnostic queries 
> ----------------------------------------------------------
>
>                 Key: YARN-10421
>                 URL: https://issues.apache.org/jira/browse/YARN-10421
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Benjamin Teke
>            Assignee: Benjamin Teke
>            Priority: Major
>         Attachments: YARN-10421.001.patch, YARN-10421.002.patch
>
>
> YarnDiagnosticsServlet should run inside ResourceManager Daemon. The servlet 
> forks a separate process, which executes a shell/Python/etc script. Based on 
> the use-cases listed below the script collects information, bundles it and 
> sends it to UI2. The diagnostic options are the following:
>  # Application hanging: 
>  ** Application logs
>  ** Find the hanging container and get multiple Jstacks
>  ** ResourceManager logs during job lifecycle
>  ** NodeManager logs from NodeManager where the hanging containers of the 
> jobs ran
>  ** Job configuration from MapReduce HistoryServer, Spark HistoryServer, Tez 
> History URL
>  # Application failed: 
>  ** Application logs
>  ** ResourceManager logs during job lifecycle.
>  ** NodeManager logs from NodeManager where the hanging containers of the 
> jobs ran
>  ** Job Configuration from MapReduce HistoryServer, Spark HistoryServer, Tez 
> History URL.
>  ** Job related metrics like container, attempts.
>  # Scheduler related issue:
>  ** ResourceManager Scheduler logs with DEBUG enabled for 2 minutes.
>  ** Multiple Jstacks of ResourceManager
>  ** YARN and Scheduler Configuration
>  ** Cluster Scheduler API _/ws/v1/cluster/scheduler_ and Cluster Nodes API 
> _/ws/v1/cluster/nodes response_
>  ** Scheduler Activities _/ws/v1/cluster/scheduler/bulkactivities_ response 
> (YARN-10319)
>  # ResourceManager / NodeManager daemon fails to start:
>  ** ResourceManager and NodeManager out and log file
>  ** YARN and Scheduler Configuration
> Two new endpoints should be added to the RM web service: one for listing the 
> available diagnostic options (_/common-issue/list_), and one for calling a 
> selected option with the user provided parameters (_/common-issue/collect_). 
> The service should be transparent to the script changes to help with the 
> (on-the-fly) extensibility of the diagnostic tool. To split the changes to 
> smaller chunks the implementation behind _collect_ endpoint is to be provided 
> in YARN-10433.



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