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https://issues.apache.org/jira/browse/HDFS-14090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928364#comment-16928364
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Hadoop QA commented on HDFS-14090:
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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 
42s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 18m 
26s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
30s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
23s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
37s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
13m 15s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 
59s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
40s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
33s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
19s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
31s{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} xml {color} | {color:green}  0m  
2s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
14m 16s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
12s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
38s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 25m 30s{color} 
| {color:red} hadoop-hdfs-rbf in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
31s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 80m 29s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | 
hadoop.hdfs.server.federation.security.TestRouterHttpDelegationToken |
|   | hadoop.hdfs.server.federation.router.TestRouterWithSecureStartup |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.1 Server=19.03.1 Image:yetus/hadoop:bdbca0e53b4 |
| JIRA Issue | HDFS-14090 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12980165/HDFS-14090.013.patch |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  xml  |
| uname | Linux 6d24e9689582 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 | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 68612a0 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_222 |
| findbugs | v3.1.0-RC1 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/27852/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs-rbf.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/27852/testReport/ |
| Max. process+thread count | 1610 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs-rbf U: 
hadoop-hdfs-project/hadoop-hdfs-rbf |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/27852/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> RBF: Improved isolation for downstream name nodes. {Static}
> -----------------------------------------------------------
>
>                 Key: HDFS-14090
>                 URL: https://issues.apache.org/jira/browse/HDFS-14090
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: CR Hota
>            Assignee: CR Hota
>            Priority: Major
>         Attachments: HDFS-14090-HDFS-13891.001.patch, 
> HDFS-14090-HDFS-13891.002.patch, HDFS-14090-HDFS-13891.003.patch, 
> HDFS-14090-HDFS-13891.004.patch, HDFS-14090-HDFS-13891.005.patch, 
> HDFS-14090.006.patch, HDFS-14090.007.patch, HDFS-14090.008.patch, 
> HDFS-14090.009.patch, HDFS-14090.010.patch, HDFS-14090.011.patch, 
> HDFS-14090.012.patch, HDFS-14090.013.patch, RBF_ Isolation design.pdf
>
>
> Router is a gateway to underlying name nodes. Gateway architectures, should 
> help minimize impact of clients connecting to healthy clusters vs unhealthy 
> clusters.
> For example - If there are 2 name nodes downstream, and one of them is 
> heavily loaded with calls spiking rpc queue times, due to back pressure the 
> same with start reflecting on the router. As a result of this, clients 
> connecting to healthy/faster name nodes will also slow down as same rpc queue 
> is maintained for all calls at the router layer. Essentially the same IPC 
> thread pool is used by router to connect to all name nodes.
> Currently router uses one single rpc queue for all calls. Lets discuss how we 
> can change the architecture and add some throttling logic for 
> unhealthy/slow/overloaded name nodes.
> One way could be to read from current call queue, immediately identify 
> downstream name node and maintain a separate queue for each underlying name 
> node. Another simpler way is to maintain some sort of rate limiter configured 
> for each name node and let routers drop/reject/send error requests after 
> certain threshold. 
> This won’t be a simple change as router’s ‘Server’ layer would need redesign 
> and implementation. Currently this layer is the same as name node.
> Opening this ticket to discuss, design and implement this feature.
>  



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