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https://issues.apache.org/jira/browse/MAPREDUCE-7329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17311134#comment-17311134
 ] 

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 
36s{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: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} 33m 
40s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
41s{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}  0m 
36s{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 
35s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
44s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
24s{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 
21s{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 
20s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
14m 32s{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}  0m 
30s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
35s{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}  0m 
35s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
27s{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}  0m 
27s{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:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 26s{color} | 
[/results-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt|https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2775/2/artifact/out/results-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt]
 | {color:orange} 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core: 
The patch generated 2 new + 7 unchanged - 0 fixed = 9 total (was 7) {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} javadoc {color} | {color:green}  0m 
15s{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 
14s{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}  1m 
19s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
14m 23s{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 15s{color} 
| 
[/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt|https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2775/2/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:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
32s{color} |  | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 80m 27s{color} | 
 | {color:black}{color} |
\\
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|| Reason || Tests ||
| Failed junit tests | hadoop.mapred.TestJobEndNotifier |
\\
\\
|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2775/2/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 2bf8a2b04881 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28 
05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 5dcb6055edccc1f12c2531002b7b66a611d9761f |
| 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-2775/2/testReport/ |
| Max. process+thread count | 1557 (vs. ulimit of 5500) |
| modules | C: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core 
U: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core |
| Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2775/2/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.



> 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: 2h 10m
>  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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