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From "Till Toenshoff (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-7429) Allow isolators to inject task-specific environment variables.
Date Thu, 27 Apr 2017 21:43:04 GMT

    [ https://issues.apache.org/jira/browse/MESOS-7429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15987753#comment-15987753
] 

Till Toenshoff commented on MESOS-7429:
---------------------------------------

[~jpeach@apache.org] Custom executors currently have no way of receiving task specific environments
injected by isolators - isolators do no mutate the {{TaskInfo}}. What we do for them already
is passing the {{ContainerLaunchInfo}} returned {{environment}} on to the executor command
environment {{execvpe}}.

> Allow isolators to inject task-specific environment variables.
> --------------------------------------------------------------
>
>                 Key: MESOS-7429
>                 URL: https://issues.apache.org/jira/browse/MESOS-7429
>             Project: Mesos
>          Issue Type: Improvement
>    Affects Versions: 1.2.0
>            Reporter: Till Toenshoff
>            Assignee: Till Toenshoff
>              Labels: containerizer, isolator, mesosphere
>
> For command tasks, we currently have no way for isolators to inject task specific environments
into data path.
> Isolators in their {{prepare}} implementation can return a {{ContainerLaunchInfo}} which
currently supports setting the member {{environment}} - but that is effective for the executor
already and will get inherited by the task environment.
> Given that the command-executor is active in the host-fs context but the task may be
running in a container-fs context ({{has_rootfs=true}}), using the above will possibly cause
failures, depending on the nature of the variables set -- consider e.g. {{LD_LIBRARY_PATH}}
as a fatal one.
> The command-executor does support the flag {{task_environment}} to receive environment
variables which are meant exclusively for the task itself but not the executor.
> Runtime isolators (docker/runtime, appc/runtime) already make use of this flag. However,
they do it in a way that is a bit unfortunate as it does not allow for other isolators to
make use of it - there is no merging taking place in the containerizer.



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