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https://issues.apache.org/jira/browse/HDFS-13388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16433934#comment-16433934
 ] 

genericqa commented on HDFS-13388:
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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 
41s{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:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  
0s{color} | {color:red} The patch doesn't appear to include any new or modified 
tests. Please justify why no new tests are needed for this patch. Also please 
list what manual steps were performed to verify this patch. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 27m 
36s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
41s{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 
48s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
11m 26s{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}  1m 
43s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
26s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
42s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
38s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
38s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
17s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
39s{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} shadedclient {color} | {color:green} 
11m 22s{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 
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
24s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m 
34s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
24s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 61m 53s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:8620d2b |
| JIRA Issue | HDFS-13388 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12918556/HADOOP-13388.0007.patch
 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  shadedclient  findbugs  checkstyle  |
| uname | Linux 15f6d0da70f3 3.13.0-143-generic #192-Ubuntu SMP Tue Feb 27 
10:45:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 7eb783e |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_162 |
| findbugs | v3.1.0-RC1 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/23880/testReport/ |
| Max. process+thread count | 301 (vs. ulimit of 10000) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs-client U: 
hadoop-hdfs-project/hadoop-hdfs-client |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/23880/console |
| Powered by | Apache Yetus 0.8.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> RequestHedgingProxyProvider calls multiple configured NNs all the time
> ----------------------------------------------------------------------
>
>                 Key: HDFS-13388
>                 URL: https://issues.apache.org/jira/browse/HDFS-13388
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>            Reporter: Jinglun
>            Assignee: Jinglun
>            Priority: Major
>             Fix For: 2.10.0, 3.2.0, 3.1.1
>
>         Attachments: HADOOP-13388.0001.patch, HADOOP-13388.0002.patch, 
> HADOOP-13388.0003.patch, HADOOP-13388.0004.patch, HADOOP-13388.0005.patch, 
> HADOOP-13388.0006.patch, HADOOP-13388.0007.patch
>
>
> In HDFS-7858 RequestHedgingProxyProvider was designed to "first 
> simultaneously call multiple configured NNs to decide which is the active 
> Namenode and then for subsequent calls it will invoke the previously 
> successful NN ." But the current code call multiple configured NNs every time 
> even when we already got the successful NN. 
>  That's because in RetryInvocationHandler.java, ProxyDescriptor's member 
> proxyInfo is assigned only when it is constructed or when failover occurs. 
> RequestHedgingProxyProvider.currentUsedProxy is null in both cases, so the 
> only proxy we can get is always a dynamic proxy handled by 
> RequestHedgingInvocationHandler.class. RequestHedgingInvocationHandler.class 
> handles invoked method by calling multiple configured NNs.



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