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https://issues.apache.org/jira/browse/YARN-9927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17314467#comment-17314467
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Hadoop QA commented on YARN-9927:
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|| Vote || Subsystem || Runtime ||  Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  1m 
19s{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 2 
new or modified test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} || ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  1m 
43s{color} | {color:blue}{color} | {color:blue} Maven dependency ordering for 
branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 22m 
11s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 10m  
0s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  8m 
17s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
44s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
42s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
20m  6s{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}  2m 
13s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 
26s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue} 30m 
38s{color} | {color:blue}{color} | {color:blue} Both FindBugs and SpotBugs are 
enabled, using SpotBugs. {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  5m 
58s{color} | {color:green}{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
21s{color} | {color:blue}{color} | {color:blue} Maven dependency ordering for 
patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  2m 
 6s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  9m 
14s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  9m 
14s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  8m 
16s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  8m 
16s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
1m 39s{color} | 
{color:orange}https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/892/artifact/out/diff-checkstyle-hadoop-yarn-project_hadoop-yarn.txt{color}
 | {color:orange} hadoop-yarn-project/hadoop-yarn: The patch generated 2 new + 
276 unchanged - 0 fixed = 278 total (was 276) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
33s{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} 
15m 18s{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}  2m  
9s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 
20s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  6m 
32s{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}  0m 
57s{color} | {color:green}{color} | {color:green} hadoop-yarn-api in the patch 
passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  4m 
39s{color} | {color:green}{color} | {color:green} hadoop-yarn-common in the 
patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}114m 
38s{color} | {color:green}{color} | {color:green} 
hadoop-yarn-server-resourcemanager in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
43s{color} | {color:green}{color} | {color:green} The patch does not generate 
ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}248m 57s{color} | 
{color:black}{color} | {color:black}{color} |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/892/artifact/out/Dockerfile
 |
| JIRA Issue | YARN-9927 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13023383/YARN-9927.003.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle spotbugs |
| uname | Linux 87c7a78c2b33 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28 
05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 96e410a1275 |
| Default Java | Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 |
|  Test Results | 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/892/testReport/ |
| Max. process+thread count | 823 (vs. ulimit of 5500) |
| modules | C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
 U: hadoop-yarn-project/hadoop-yarn |
| Console output | 
https://ci-hadoop.apache.org/job/PreCommit-YARN-Build/892/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |


This message was automatically generated.



> RM multi-thread event processing mechanism
> ------------------------------------------
>
>                 Key: YARN-9927
>                 URL: https://issues.apache.org/jira/browse/YARN-9927
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>    Affects Versions: 3.0.0, 2.9.2
>            Reporter: hcarrot
>            Assignee: Qi Zhu
>            Priority: Major
>         Attachments: RM multi-thread event processing mechanism.pdf, 
> YARN-9927.001.patch, YARN-9927.002.patch, YARN-9927.003.patch
>
>
> Recently, we have observed serious event blocking in RM event dispatcher 
> queue. After analysis of RM event monitoring data and RM event processing 
> logic, we found that
> 1) environment: a cluster with thousands of nodes
> 2) RMNodeStatusEvent dominates 90% time consumption of RM event scheduler
> 3) Meanwhile, RM event processing is in a single-thread mode, and It results 
> in the low headroom of RM event scheduler, thus performance of RM.
> So we proposed a RM multi-thread event processing mechanism to improve RM 
> performance.



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