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https://issues.apache.org/jira/browse/YARN-4757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318674#comment-15318674
 ] 

Hadoop QA commented on YARN-4757:
---------------------------------

| (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 29s 
{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 4 new or modified test 
files. {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 12s 
{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m 
16s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 6m 24s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m 
20s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 28s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
21s {color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m 0s 
{color} | {color:blue} Skipped patched modules with no Java source: 
hadoop-project {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 
23s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 22s 
{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 14s 
{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
21s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 6m 24s 
{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 6m 24s {color} 
| {color:red} root generated 1 new + 697 unchanged - 0 fixed = 698 total (was 
697) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 1m 21s 
{color} | {color:red} root: The patch generated 2 new + 1 unchanged - 46 fixed 
= 3 total (was 47) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 27s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
21s {color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m 0s 
{color} | {color:red} The patch 12 line(s) with tabs. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green} 0m 2s 
{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m 0s 
{color} | {color:blue} Skipped patched modules with no Java source: 
hadoop-project {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 0m 34s 
{color} | {color:red} hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry 
generated 3 new + 0 unchanged - 0 fixed = 3 total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 22s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 9s 
{color} | {color:green} hadoop-project in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 54s 
{color} | {color:green} hadoop-yarn-registry in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
20s {color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 28m 30s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry |
|  |  Exceptional return value of 
java.util.concurrent.ExecutorService.submit(Callable) ignored in 
org.apache.hadoop.registry.server.dns.RegistryDNS.addNIOTCP(InetAddress, int)  
At RegistryDNS.java:ignored in 
org.apache.hadoop.registry.server.dns.RegistryDNS.addNIOTCP(InetAddress, int)  
At RegistryDNS.java:[line 720] |
|  |  Exceptional return value of 
java.util.concurrent.ExecutorService.submit(Callable) ignored in 
org.apache.hadoop.registry.server.dns.RegistryDNS.addNIOUDP(InetAddress, int)  
At RegistryDNS.java:ignored in 
org.apache.hadoop.registry.server.dns.RegistryDNS.addNIOUDP(InetAddress, int)  
At RegistryDNS.java:[line 746] |
|  |  Exceptional return value of 
java.util.concurrent.ExecutorService.submit(Callable) ignored in 
org.apache.hadoop.registry.server.dns.RegistryDNS.serveNIOTCP(ServerSocketChannel,
 InetAddress, int)  At RegistryDNS.java:ignored in 
org.apache.hadoop.registry.server.dns.RegistryDNS.serveNIOTCP(ServerSocketChannel,
 InetAddress, int)  At RegistryDNS.java:[line 672] |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:2c91fd8 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12808691/YARN-4757.001.patch |
| JIRA Issue | YARN-4757 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  xml  findbugs  checkstyle  |
| uname | Linux 391c769ced55 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed 
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / e620530 |
| Default Java | 1.8.0_91 |
| findbugs | v3.0.0 |
| javac | 
https://builds.apache.org/job/PreCommit-YARN-Build/11879/artifact/patchprocess/diff-compile-javac-root.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-YARN-Build/11879/artifact/patchprocess/diff-checkstyle-root.txt
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-YARN-Build/11879/artifact/patchprocess/whitespace-tabs.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-YARN-Build/11879/artifact/patchprocess/new-findbugs-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-registry.html
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/11879/testReport/ |
| modules | C: hadoop-project 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/11879/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> [Umbrella] Simplified discovery of services via DNS mechanisms
> --------------------------------------------------------------
>
>                 Key: YARN-4757
>                 URL: https://issues.apache.org/jira/browse/YARN-4757
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Jonathan Maron
>         Attachments: 
> 0001-YARN-4757-Initial-code-submission-for-DNS-Service.patch, YARN-4757- 
> Simplified discovery of services via DNS mechanisms.pdf, 
> YARN-4757-YARN-4757.001.patch, YARN-4757-YARN-4757.002.patch, 
> YARN-4757-YARN-4757.003.patch, YARN-4757.001.patch
>
>
> [See overview doc at YARN-4692, copying the sub-section (3.2.10.2) to track 
> all related efforts.]
> In addition to completing the present story of service­-registry (YARN-913), 
> we also need to simplify the access to the registry entries. The existing 
> read mechanisms of the YARN Service Registry are currently limited to a 
> registry specific (java) API and a REST interface. In practice, this makes it 
> very difficult for wiring up existing clients and services. For e.g, dynamic 
> configuration of dependent end­points of a service is not easy to implement 
> using the present registry­-read mechanisms, *without* code-changes to 
> existing services.
> A good solution to this is to expose the registry information through a more 
> generic and widely used discovery mechanism: DNS. Service Discovery via DNS 
> uses the well-­known DNS interfaces to browse the network for services. 
> YARN-913 in fact talked about such a DNS based mechanism but left it as a 
> future task. (Task) Having the registry information exposed via DNS 
> simplifies the life of services.



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