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https://issues.apache.org/jira/browse/YARN-10216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17146197#comment-17146197
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Hadoop QA commented on YARN-10216:
----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  2m  
2s{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 1 new or modified test 
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  1m 
21s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 27m 
17s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 22m 
51s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  3m 
34s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  5m  
7s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
27m 40s{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}  3m 
23s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  2m 
14s{color} | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  8m 
42s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
27s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
33s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 24m 
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 24m 
25s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
3m 38s{color} | {color:orange} root: The patch generated 13 new + 289 unchanged 
- 0 fixed = 302 total (was 289) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  4m 
55s{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} 
17m  5s{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 
53s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  2m 
47s{color} | {color:red} hadoop-common-project/hadoop-common generated 1 new + 
0 unchanged - 0 fixed = 1 total (was 0) {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 12m 
12s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  1m 23s{color} 
| {color:red} hadoop-yarn-api in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 24m 
48s{color} | {color:green} hadoop-yarn-server-nodemanager in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 93m 
49s{color} | {color:green} hadoop-yarn-server-resourcemanager in the patch 
passed. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 
50s{color} | {color:red} The patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}296m 30s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:hadoop-common-project/hadoop-common |
|  |  Inconsistent synchronization of 
org.apache.hadoop.conf.ConfigurationManager.watchService; locked 75% of time  
Unsynchronized access at ConfigurationManager.java:75% of time  Unsynchronized 
access at ConfigurationManager.java:[line 281] |
| Failed junit tests | hadoop.yarn.conf.TestYarnConfigurationFields |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base: 
https://builds.apache.org/job/PreCommit-YARN-Build/26215/artifact/out/Dockerfile
 |
| JIRA Issue | YARN-10216 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13006481/YARN-10216.001.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle |
| uname | Linux b2ddf37e19b2 4.15.0-101-generic #102-Ubuntu SMP Mon May 11 
10:07:26 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 6a8fd73b273 |
| Default Java | Private Build-1.8.0_252-8u252-b09-1~18.04-b09 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-YARN-Build/26215/artifact/out/diff-checkstyle-root.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-YARN-Build/26215/artifact/out/new-findbugs-hadoop-common-project_hadoop-common.html
 |
| unit | 
https://builds.apache.org/job/PreCommit-YARN-Build/26215/artifact/out/patch-unit-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-api.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/26215/testReport/ |
| asflicense | 
https://builds.apache.org/job/PreCommit-YARN-Build/26215/artifact/out/patch-asflicense-problems.txt
 |
| Max. process+thread count | 1348 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common 
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-server/hadoop-yarn-server-resourcemanager
 U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/26215/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=3.1.0-RC1 |
| Powered by | Apache Yetus 0.12.0 https://yetus.apache.org |


This message was automatically generated.



> Utility to dynamically reload Configuration on the disk
> -------------------------------------------------------
>
>                 Key: YARN-10216
>                 URL: https://issues.apache.org/jira/browse/YARN-10216
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Cyrus Jackson
>            Assignee: Cyrus Jackson
>            Priority: Major
>         Attachments: YARN-10216.001.patch, image-2020-04-06-09-50-51-948.png
>
>
> There should be a way to dynamically reload the configuration properties from 
> the disk. The purpose of this feature is to let individual classes which are 
> interested in observing this configuration changes, to be notified when the 
> conf is reloaded from the disk. This is similar to how Hbase has done.
> *Class Diagram*
>                                           !image-2020-04-06-09-50-51-948.png!
>  
> *APPROACH DETAILS* 
> The approach is based on the adaption of Hbase Online Configuration. In this 
> case, the configuration file is monitored for any changes on the disk. If the 
> file has changed, the properties of Configuration is reloaded and all the 
> observers are notified. 
> The classes that implements the observers updates the necessary values if 
> required.
>  



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