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https://issues.apache.org/jira/browse/MAPREDUCE-7329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17316919#comment-17316919
 ] 

Hadoop QA commented on MAPREDUCE-7329:
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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 
48s{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  
0s{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 1 new or modified 
test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} || ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 14m 
11s{color} |  | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 22m 
42s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m 
34s{color} |  | {color:green} trunk passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m  
6s{color} |  | {color:green} trunk passed with JDK Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
56s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
10s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
42s{color} |  | {color:green} trunk passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
39s{color} |  | {color:green} trunk passed with JDK Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  1m 
56s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m 15s{color} |  | {color:green} branch has no errors when building and 
testing our client artifacts. {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
20s{color} |  | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
58s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m 
24s{color} |  | {color:green} the patch passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  2m 
24s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m  
2s{color} |  | {color:green} the patch passed with JDK Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  2m  
2s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} blanks {color} | {color:green}  0m  
0s{color} |  | {color:green} The patch has no blanks issues. {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
50s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
57s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
31s{color} |  | {color:green} the patch passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
29s{color} |  | {color:green} the patch passed with JDK Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  2m  
7s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m 19s{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}  7m 42s{color} 
| 
[/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt|https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2775/10/artifact/out/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt]
 | {color:red} hadoop-mapreduce-client-core in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}135m 17s{color} 
| 
[/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-jobclient.txt|https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2775/10/artifact/out/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-jobclient.txt]
 | {color:red} hadoop-mapreduce-client-jobclient in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
34s{color} |  | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}236m 19s{color} | 
 | {color:black}{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.mapred.TestJobEndNotifier |
|   | hadoop.mapreduce.TestMRJobClient |
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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-2775/10/artifact/out/Dockerfile
 |
| GITHUB PR | https://github.com/apache/hadoop/pull/2775 |
| JIRA Issue | MAPREDUCE-7329 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient spotbugs checkstyle codespell |
| uname | Linux 8a43060978c9 4.15.0-126-generic #129-Ubuntu SMP Mon Nov 23 
18:53:38 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 9d4443f5502d5ff82fedcdbc99571980404d1478 |
| Default Java | Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 |
|  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2775/10/testReport/ |
| Max. process+thread count | 1192 (vs. ulimit of 5500) |
| modules | C: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient
 U: hadoop-mapreduce-project/hadoop-mapreduce-client |
| Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2775/10/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.



> HadoopPipes task failed as a result of ping timeout exception
> -------------------------------------------------------------
>
>                 Key: MAPREDUCE-7329
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7329
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: chaoli
>            Priority: Major
>              Labels: patch, pull-request-available
>             Fix For: 2.6.0, 3.0.0
>
>         Attachments: 
> 0001-MAPREDUCE-7329-HadoopPipes-task-may-fail-when-linux-.patch, 
> image-2021-03-15-14-29-49-475.png, image-2021-03-15-14-37-32-184.png
>
>          Time Spent: 5h 40m
>  Remaining Estimate: 0h
>
> {color:#FF0000}*Hadoop Pipes Ping implement has a bug*{color}. Recently, we 
> upgrade linux kernel version from 3.x to 4.x. And we find hadoop pipe task 
> exit with connect timeout which is implemented by PingThread in 
> HadoopPipes.cc.
> !image-2021-03-15-14-37-32-184.png!
> After a deep research, we finally find that current ping server won't accept 
> ping client created socket, which may cause critical problem: 
>  *  it will cause tcp accept queue full(default 50)
>  *  when client close socket, server socket won't call close method, which 
> will leave too many CLOSE_WAIT socket fd existed(default 2h), and accept 
> queue never cleared.
>  * Even worse, in 4.x linux kernel version, it will cause tcp drop packet 
> directly which makes ping client connect time out. While In 3.x linux kernel 
> version, when accept queue full, client can also make half connection till 
> sync queue full (default 2048), so from client side, ping will aslo work till 
> sync queue full. And after 3 hours, task will also exit with connect timeout 
> exception.
> To fix this bug, we introduced a PingSocketCleaner thread, which will 
> continuously accept ping socket connect from ping client. When socket close 
> from client,  cleaner thread will detecte closed inputStream reading, then 
> finally close socket from sever side.
> Refrenced by linux kernel patch: 
> [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ea8ea2cb7]
>  



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