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https://issues.apache.org/jira/browse/HADOOP-16543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16936149#comment-16936149
 ] 

Hadoop QA commented on HADOOP-16543:
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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}  0m 
45s{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 2 new or modified test 
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
41s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m 
42s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 10m  
8s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
19s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  3m  
9s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m 55s{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 
52s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  0m 
33s{color} | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
33s{color} | {color:blue} 
branch/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site no findbugs output file 
(findbugsXml.xml) {color} |
| {color:orange}-0{color} | {color:orange} patch {color} | {color:orange}  1m 
18s{color} | {color:orange} Used diff version of patch file. Binary files and 
potentially other changes not applied. Please rebase and squash commits if 
necessary. {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
18s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  2m 
 2s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  7m 
35s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  7m 
35s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
1m 24s{color} | {color:orange} hadoop-yarn-project/hadoop-yarn: The patch 
generated 15 new + 215 unchanged - 0 fixed = 230 total (was 215) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
57s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  
0s{color} | {color:red} The patch has 8 line(s) that end in whitespace. Use git 
apply --whitespace=fix <<patch_file>>. Refer https://git-scm.com/docs/git-apply 
{color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green}  0m  
1s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
13m 24s{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 
44s{color} | {color:green} the patch passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
30s{color} | {color:blue} hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site has 
no data from findbugs {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m  
3s{color} | {color:green} hadoop-yarn-api in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  4m  
9s{color} | {color:green} hadoop-yarn-common in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 27m  
3s{color} | {color:green} hadoop-yarn-client in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
28s{color} | {color:green} hadoop-yarn-site in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
49s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}131m 36s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.1 Server=19.03.1 base: 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1399/11/artifact/out/Dockerfile
 |
| GITHUB PR | https://github.com/apache/hadoop/pull/1399 |
| JIRA Issue | HADOOP-16543 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle xml |
| uname | Linux 65e5f32fab29 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / c30e495 |
| Default Java | 1.8.0_222 |
| checkstyle | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1399/11/artifact/out/diff-checkstyle-hadoop-yarn-project_hadoop-yarn.txt
 |
| whitespace | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1399/11/artifact/out/whitespace-eol.txt
 |
|  Test Results | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1399/11/testReport/ |
| Max. process+thread count | 554 (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-client 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site U: 
hadoop-yarn-project/hadoop-yarn |
| Console output | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1399/11/console |
| versions | git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1 |
| Powered by | Apache Yetus 0.10.0 http://yetus.apache.org |


This message was automatically generated.



> Cached DNS name resolution error
> --------------------------------
>
>                 Key: HADOOP-16543
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16543
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 3.1.2
>            Reporter: Roger Liu
>            Priority: Major
>
> In Kubernetes, the a node may go down and then come back later with a 
> different IP address. Yarn clients which are already running will be unable 
> to rediscover the node after it comes back up due to caching the original IP 
> address. This is problematic for cases such as Spark HA on Kubernetes, as the 
> node containing the resource manager may go down and come back up, meaning 
> existing node managers must then also be restarted.



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