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https://issues.apache.org/jira/browse/MAPREDUCE-7017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17250943#comment-17250943
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Hadoop QA commented on MAPREDUCE-7017:
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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}  0m 
36s{color} | {color:blue}{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}{color} | {color:green} No case conflicting files 
found. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green}{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}{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} 40m 
 6s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
41s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
37s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
34s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
40s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
21m 14s{color} | {color:green}{color} | {color:green} branch has no errors when 
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
34s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
27s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  1m 
14s{color} | {color:blue}{color} | {color:blue} Used deprecated FindBugs 
config; considering switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
11s{color} | {color:green}{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
41s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
35s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
35s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
25s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
25s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 25s{color} | 
{color:orange}https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-309/6/artifact/out/diff-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-app.txt{color}
 | {color:orange} 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app: 
The patch generated 2 new + 264 unchanged - 0 fixed = 266 total (was 264) 
{color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
30s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  
0s{color} | 
{color:red}https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-309/6/artifact/out/whitespace-eol.txt{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:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
14m 49s{color} | {color:green}{color} | {color:green} patch has no errors when 
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
27s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
24s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m  
2s{color} | {color:green}{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} || ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  8m 21s{color} 
| 
{color:red}https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-309/6/artifact/out/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-app.txt{color}
 | {color:red} hadoop-mapreduce-client-app in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
32s{color} | {color:green}{color} | {color:green} The patch does not generate 
ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 97m  8s{color} | 
{color:black}{color} | {color:black}{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.mapreduce.v2.app.job.impl.TestTaskAttempt |
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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-309/6/artifact/out/Dockerfile
 |
| GITHUB PR | https://github.com/apache/hadoop/pull/309 |
| JIRA Issue | MAPREDUCE-7017 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle |
| uname | Linux ee78a2583feb 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 | dev-support/bin/hadoop.sh |
| git revision | trunk / 4c033bafa02 |
| Default Java | Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
|  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-309/6/testReport/ |
| Max. process+thread count | 707 (vs. ulimit of 5500) |
| modules | C: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app U: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app |
| Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-309/6/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=4.0.6 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |


This message was automatically generated.



> Too many times of meaningless invocation in TaskAttemptImpl#resolveHosts
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7017
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7017
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mr-am
>    Affects Versions: 3.0.0-alpha4
>            Reporter: jiayuhan-it
>            Assignee: jiayuhan-it
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: MAPREDUCE-7017.001.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
>   MRAppMaster uses {{TaskAttemptImpl::resolveHosts}} to determine the 
> dataLocalHosts for each task when the location of data split is IP, which 
> will call a lot of times ( taskNum * dfsReplication) of function 
> {{InetAddress::getByName}} and most of the funcition calls are redundant.  
> When the job has a great number of tasks and the speed of DNS resolution is 
> not fast enough, it will take a lot of time at this stage before the job 
> running.



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