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https://issues.apache.org/jira/browse/YARN-10863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17452717#comment-17452717
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LuoGe commented on YARN-10863:
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@chaosju please help to review it, thanks
> CGroupElasticMemoryController is not work
> -----------------------------------------
>
> Key: YARN-10863
> URL: https://issues.apache.org/jira/browse/YARN-10863
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Affects Versions: 3.3.1
> Reporter: LuoGe
> Priority: Major
> Attachments: YARN-10863.001-1.patch, YARN-10863.002.patch,
> YARN-10863.004.patch, YARN-10863.005.patch, YARN-10863.006.patch,
> YARN-10863.007.patch
>
>
> When following the
> [documentation|https://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/NodeManagerCGroupsMemory.html]
> configuring elastic memory resource control,
> yarn.nodemanager.elastic-memory-control.enabled set true,
> yarn.nodemanager.resource.memory.enforced set to false,
> yarn.nodemanager.pmem-check-enabled set true, and
> yarn.nodemanager.resource.memory.enabled set true to use cgroup control
> memory, but elastic memory control is not work.
> I see the code ContainersMonitorImpl.java, in checkLimit function, the skip
> logic have some problem. The return condition is strictMemoryEnforcement is
> true and elasticMemoryEnforcement is false. So, following the document set
> use elastic memory control, the check logic will continue, when container
> memory used over limit will killed by checkLimit.
> {code:java}
> if (strictMemoryEnforcement && !elasticMemoryEnforcement) {
> // When cgroup-based strict memory enforcement is used alone without
> // elastic memory control, the oom-kill would take care of it.
> // However, when elastic memory control is also enabled, the oom killer
> // would be disabled at the root yarn container cgroup level (all child
> // cgroups would inherit that setting). Hence, we fall back to the
> // polling-based mechanism.
> return;
> }
> {code}
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