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https://issues.apache.org/jira/browse/HDFS-11242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15747564#comment-15747564
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Hadoop QA commented on HDFS-11242:
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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 
23s{color} | {color:blue} Docker mode activated. {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:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
29s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  8m 
12s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
22s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
36s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
27s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
25s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m 
11s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
59s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m  
7s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red}  0m 
26s{color} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red}  0m 
47s{color} | {color:red} hadoop-hdfs-project in the patch failed. {color} |
| {color:red}-1{color} | {color:red} cc {color} | {color:red}  0m 47s{color} | 
{color:red} hadoop-hdfs-project in the patch failed. {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  0m 47s{color} 
| {color:red} hadoop-hdfs-project in the patch failed. {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 33s{color} | {color:orange} hadoop-hdfs-project: The patch generated 26 new 
+ 576 unchanged - 1 fixed = 602 total (was 577) {color} |
| {color:red}-1{color} | {color:red} mvnsite {color} | {color:red}  0m 
33s{color} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
24s{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 1 line(s) that end in whitespace. Use git 
apply --whitespace=fix <<patch_file>>. Refer https://git-scm.com/docs/git-apply 
{color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  0m 
16s{color} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
7s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m  
2s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  0m 33s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 
21s{color} | {color:red} The patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 27m 30s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:a9ad5d6 |
| JIRA Issue | HDFS-11242 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12843164/HDFS-11242.patch |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  cc  |
| uname | Linux f9f3d4c91937 3.13.0-103-generic #150-Ubuntu SMP Thu Nov 24 
10:34:17 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / 1f14f6d |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| mvninstall | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/patch-mvninstall-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| compile | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/patch-compile-hadoop-hdfs-project.txt
 |
| cc | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/patch-compile-hadoop-hdfs-project.txt
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| javac | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/patch-compile-hadoop-hdfs-project.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project.txt
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| mvnsite | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/patch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/whitespace-eol.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/patch-findbugs-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/testReport/ |
| asflicense | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/artifact/patchprocess/patch-asflicense-problems.txt
 |
| modules | C: hadoop-hdfs-project/hadoop-hdfs-client 
hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/17854/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Add refresh cluster network topology operation to dfs admin
> -----------------------------------------------------------
>
>                 Key: HDFS-11242
>                 URL: https://issues.apache.org/jira/browse/HDFS-11242
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Reid Chan
>            Priority: Minor
>         Attachments: HDFS-11242.patch
>
>
> The network topology and dns to switch mapping are initialized at the start 
> of the namenode.
> If admin wants to change the topology because of new datanodes added, he has 
> to stop and restart namenode(s), otherwise those new added datanodes are 
> squeezed under /default-rack.
> It is a low frequency operation, but it should be operated appropriately, so 
> dfs admin should take the responsibility.



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