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https://issues.apache.org/jira/browse/MESOS-8342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vishnu Mohan updated MESOS-8342:
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Component/s: docker
> Make the Docker containerizer exhibit the same behavior as Mesos/UCR which
> sets `memory.memsw.limit_in_bytes` to be equal to `memory.limit_in_bytes`
> when `MESOS_CGROUPS_LIMIT_SWAP=true`
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MESOS-8342
> URL: https://issues.apache.org/jira/browse/MESOS-8342
> Project: Mesos
> Issue Type: Improvement
> Components: containerization, docker
> Affects Versions: 1.4.1
> Reporter: Vishnu Mohan
>
> Please add support for the functionality afforded by the {{\--memory-swap}}
> and {{\--memory-swappiness}} {{docker run}} options to the Docker
> Containerizer:
> https://github.com/apache/mesos/blob/1.4.x/src/docker/docker.hpp#L193-L194
> ATM the Docker containerizer does not honor
> {{MESOS_CGROUPS_LIMIT_SWAP=true}}, and depending on the OS {{swappiness}}
> configuration, the Docker Engine will (typically) set
> {{memory.memsw.limit_in_bytes}} to twice the value of
> {{memory.limit_in_bytes}}
> This means that all Docker containers can/will swap up to 2x their allocation
> before being OOM-killed by the Docker Engine which can cause a huge
> performance problem.
> The only real workaround, for now, is to ensure that all apps that are
> launched by the Docker containerizer (at least those that are launched via
> Marathon) also pass {{\--memory-swap=<memory_allocation>}} and/or pass
> {{\--memory-swappiness=0}}, depending on the version of the Docker Engine,
> ({{docker run --help}}), as arbitrary Docker params, assuming the scheduler
> supports it, which is operationally cumbersome.
> Ideally, the Docker containerizer would exhibit the same behavior as
> Mesos/UCR which sets {{memory.memsw.limit_in_bytes}} to be equal to
> {{memory.limit_in_bytes}} when {{MESOS_CGROUPS_LIMIT_SWAP=true}}
> Ref:
> https://docs.docker.com/engine/admin/resource_constraints/#prevent-a-container-from-using-swap
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