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https://issues.apache.org/jira/browse/HDFS-16417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17469903#comment-17469903
 ] 

Hadoop QA commented on HDFS-16417:
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|| Vote || Subsystem || Runtime ||  Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 13m  
8s{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} {color} | {color:green}  0m  0s{color} 
| {color:green}test4tests{color} | {color:green} The patch appears to include 1 
new or modified test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 32m 
 2s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
42s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
40s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
28s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
45s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
20m 23s{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}  0m 
45s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
58s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue} 23m 
24s{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}  1m 
18s{color} | {color:green}{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
35s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
35s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
35s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
31s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
31s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
18s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
34s{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} 
18m 44s{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}  0m 
36s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
53s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  1m 
22s{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} 20m 
37s{color} | {color:green}{color} | {color:green} hadoop-hdfs-rbf in the patch 
passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
35s{color} | {color:green}{color} | {color:green} The patch does not generate 
ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}118m 33s{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-HDFS-Build/753/artifact/out/Dockerfile
 |
| JIRA Issue | HDFS-16417 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13038338/HDFS-16417.001.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient spotbugs checkstyle |
| uname | Linux d531cab34e9c 4.15.0-156-generic #163-Ubuntu SMP Thu Aug 19 
23:31:58 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / f64fda0f00b |
| Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
|  Test Results | 
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/753/testReport/ |
| Max. process+thread count | 2601 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs-rbf U: 
hadoop-hdfs-project/hadoop-hdfs-rbf |
| Console output | 
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/753/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.



> RBF: StaticRouterRpcFairnessPolicyController init fails with division by 0 if 
> concurrent ns handler count is configured
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-16417
>                 URL: https://issues.apache.org/jira/browse/HDFS-16417
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: rbf
>            Reporter: Felix N
>            Priority: Minor
>         Attachments: HDFS-16417.001.patch
>
>
> If {{dfs.federation.router.fairness.handler.count.concurrent}} is configured, 
> unassignedNS is thus empty and {{handlerCount % unassignedNS.size()}} will 
> throw a /0 exception.
> Changed it to assigning extra handlers to concurrent ns in case it's 
> configured.



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