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From "Christopher Hunt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-1718) Command executor can overcommit the slave.
Date Fri, 22 Jul 2016 09:45:20 GMT

    [ https://issues.apache.org/jira/browse/MESOS-1718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15389230#comment-15389230
] 

Christopher Hunt commented on MESOS-1718:
-----------------------------------------

I realise that this is an old comment, but I'm curious to learn whether always adding an executor's
resources can be avoided.

I have a situation where my executor requires 1.0 cpu. This means that every task it runs
will require at least 1.0 cpu, and we'll quickly use up the cpu count for a given node. On
a large EC2 instance of 4 cpus, I can probably run just two tasks with my executor.

> Command executor can overcommit the slave.
> ------------------------------------------
>
>                 Key: MESOS-1718
>                 URL: https://issues.apache.org/jira/browse/MESOS-1718
>             Project: Mesos
>          Issue Type: Bug
>          Components: slave
>            Reporter: Benjamin Mahler
>
> Currently we give a small amount of resources to the command executor, in addition to
resources used by the command task:
> https://github.com/apache/mesos/blob/0.20.0-rc1/src/slave/slave.cpp#L2448
> {code: title=}
> ExecutorInfo Slave::getExecutorInfo(
>     const FrameworkID& frameworkId,
>     const TaskInfo& task)
> {
>   ...
>     // Add an allowance for the command executor. This does lead to a
>     // small overcommit of resources.
>     executor.mutable_resources()->MergeFrom(
>         Resources::parse(
>           "cpus:" + stringify(DEFAULT_EXECUTOR_CPUS) + ";" +
>           "mem:" + stringify(DEFAULT_EXECUTOR_MEM.megabytes())).get());
>   ...
> }
> {code}
> This leads to an overcommit of the slave. Ideally, for command tasks we can "transfer"
all of the task resources to the executor at the slave / isolation level.



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