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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8648) Container cgroups are leaked when using docker
Date Tue, 04 Sep 2018 16:20:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603269#comment-16603269
] 

Hadoop QA commented on YARN-8648:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 19s{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: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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 18m 30s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 59s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 25s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 36s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 12m 10s{color}
| {color:green} branch has no errors when building and testing our client artifacts. {color}
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| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 54s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 24s{color} |
{color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 35s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 56s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  0m 56s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 56s{color} | {color:green}
the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  0m 21s{color}
| {color:orange} hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager:
The patch generated 1 new + 10 unchanged - 0 fixed = 11 total (was 10) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 32s{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} 12m 22s{color}
| {color:green} patch has no errors when building and testing our client artifacts. {color}
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| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m  2s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 22s{color} |
{color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 18m 20s{color} | {color:green}
hadoop-yarn-server-nodemanager in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 23s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 69m 19s{color} | {color:black}
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:ba1ab08 |
| JIRA Issue | YARN-8648 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12938265/YARN-8648.002.patch
|
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit
 shadedclient  findbugs  checkstyle  cc  |
| uname | Linux 5003ee282ea4 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 / 6e5ffb7 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.0-RC1 |
| checkstyle | https://builds.apache.org/job/PreCommit-YARN-Build/21755/artifact/out/diff-checkstyle-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-nodemanager.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-YARN-Build/21755/testReport/ |
| Max. process+thread count | 301 (vs. ulimit of 10000) |
| modules | C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager |
| Console output | https://builds.apache.org/job/PreCommit-YARN-Build/21755/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Container cgroups are leaked when using docker
> ----------------------------------------------
>
>                 Key: YARN-8648
>                 URL: https://issues.apache.org/jira/browse/YARN-8648
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jim Brennan
>            Assignee: Jim Brennan
>            Priority: Major
>              Labels: Docker
>         Attachments: YARN-8648.001.patch, YARN-8648.002.patch
>
>
> When you run with docker and enable cgroups for cpu, docker creates cgroups for all resources
on the system, not just for cpu.  For instance, if the {{yarn.nodemanager.linux-container-executor.cgroups.hierarchy=/hadoop-yarn}},
the nodemanager will create a cgroup for each container under {{/sys/fs/cgroup/cpu/hadoop-yarn}}.
 In the docker case, we pass this path via the {{--cgroup-parent}} command line argument.
  Docker then creates a cgroup for the docker container under that, for instance: {{/sys/fs/cgroup/cpu/hadoop-yarn/container_id/docker_container_id}}.
> When the container exits, docker cleans up the {{docker_container_id}} cgroup, and the
nodemanager cleans up the {{container_id}} cgroup,   All is good under {{/sys/fs/cgroup/hadoop-yarn}}.
> The problem is that docker also creates that same hierarchy under every resource under
{{/sys/fs/cgroup}}.  On the rhel7 system I am using, these are: blkio, cpuset, devices, freezer,
hugetlb, memory, net_cls, net_prio, perf_event, and systemd.    So for instance, docker creates
{{/sys/fs/cgroup/cpuset/hadoop-yarn/container_id/docker_container_id}}, but it only cleans
up the leaf cgroup {{docker_container_id}}.  Nobody cleans up the {{container_id}} cgroups
for these other resources.  On one of our busy clusters, we found > 100,000 of these leaked
cgroups.
> I found this in our 2.8-based version of hadoop, but I have been able to repro with current
hadoop.



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