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https://issues.apache.org/jira/browse/HDFS-16200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17411600#comment-17411600
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Hadoop QA commented on HDFS-16200:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime ||  Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  1m  
0s{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} No case conflicting files found. {color} |
| {color:blue}0{color} | {color:blue} codespell {color} | {color:blue}  0m  
1s{color} |  | {color:blue} codespell was not available. {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} 33m 
55s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
23s{color} |  | {color:green} trunk passed with JDK 
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
14s{color} |  | {color:green} trunk passed with JDK Private 
Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 1s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
23s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
55s{color} |  | {color:green} trunk passed with JDK 
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
22s{color} |  | {color:green} trunk passed with JDK Private 
Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  3m 
19s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
19m  8s{color} |  | {color:green} branch has no errors when building and 
testing our client artifacts. {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
14s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
20s{color} |  | {color:green} the patch passed with JDK 
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  1m 20s{color} 
| 
[/results-compile-javac-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04.txt|https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3364/2/artifact/out/results-compile-javac-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04.txt]
 | {color:red} 
hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 with 
JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 generated 1 new + 468 unchanged - 0 
fixed = 469 total (was 468) {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
9s{color} |  | {color:green} the patch passed with JDK Private 
Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  1m  9s{color} 
| 
[/results-compile-javac-hadoop-hdfs-project_hadoop-hdfs-jdkPrivateBuild-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10.txt|https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3364/2/artifact/out/results-compile-javac-hadoop-hdfs-project_hadoop-hdfs-jdkPrivateBuild-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10.txt]
 | {color:red} 
hadoop-hdfs-project_hadoop-hdfs-jdkPrivateBuild-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
 with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 generated 1 new 
+ 452 unchanged - 0 fixed = 453 total (was 452) {color} |
| {color:green}+1{color} | {color:green} blanks {color} | {color:green}  0m  
0s{color} |  | {color:green} The patch has no blanks issues. {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 55s{color} | 
[/results-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt|https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3364/2/artifact/out/results-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt]
 | {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch generated 10 new + 
467 unchanged - 0 fixed = 477 total (was 467) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
16s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
48s{color} |  | {color:green} the patch passed with JDK 
Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
18s{color} |  | {color:green} the patch passed with JDK Private 
Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  3m 
24s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
19m 14s{color} |  | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
|| || || || {color:brown} Other Tests {color} || ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}357m 58s{color} 
| 
[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt|https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3364/2/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt]
 | {color:red} hadoop-hdfs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  1m 
46s{color} |  | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}452m 34s{color} | 
 | {color:black}{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.tools.TestHdfsConfigFields |
|   | hadoop.hdfs.TestSnapshotCommands |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3364/2/artifact/out/Dockerfile
 |
| GITHUB PR | https://github.com/apache/hadoop/pull/3364 |
| JIRA Issue | HDFS-16200 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient spotbugs checkstyle codespell |
| uname | Linux 1b0e05feab0d 4.15.0-143-generic #147-Ubuntu SMP Wed Apr 14 
16:10:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 2d5afe17da9ecf3b57ab3a2f2b579954354e46c2 |
| Default Java | Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10 |
|  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3364/2/testReport/ |
| Max. process+thread count | 1988 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
| Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3364/2/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |


This message was automatically generated.



> Improve NameNode failover
> -------------------------
>
>                 Key: HDFS-16200
>                 URL: https://issues.apache.org/jira/browse/HDFS-16200
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: namanode
>    Affects Versions: 2.8.2
>            Reporter: Aihua Xu
>            Assignee: Aihua Xu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> In a busy cluster, we are noticing the NameNode failover takes longer time 
> (over 10 minutes) and it causes cluster down time during the time period.
> One bottleneck locates in resolving the client host's topology when the 
> cluster is not colocated with the computing hosts. NameNode resolves the 
> client host's topology and uses it to sort the hosts where the blocks locate 
> in. Such topology will be cached so the next access will be efficient, while 
> if the standby NameNode is newly restarted, then all the client hosts, e.g., 
> YARN hosts need to be resolved.
> Solutions can be: 1) we can expose an API in DFSAdmin to load topology cache, 
> or 2) we can add a new configuration in HDFS cluster to skip resolving 
> topology for non-colocated HDFS cluster. Since client hosts and HDFS hosts 
> are not colocated, it's unnecessary to sort the DataNodes for the clients.    
>  



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