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https://issues.apache.org/jira/browse/MESOS-1871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Rukletsov updated MESOS-1871:
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Description:
{{CommandExecutor}} launches tasks wrapping them into {{sh -c}}. That means
signals are sent to the top process—that is {{sh -c}}—and not to the task
directly. Though {{SIGTERM}} is propagated by {{sh -c}} down the process tree,
if the task is unresponsive to {{SIGTERM}}, {{sh -c}} terminates reporting
success to the {{CommandExecutor}}, rendering the task detached from the parent
process and still running. Because the {{CommandExecutor}} thinks the command
terminated normally, its OS process exits normally and may not trigger
containerizer's escalation which destroys cgroups.
Here is the test related to this issue:
[https://gist.github.com/rukletsov/3f19ecc7389fa51e65c0].
was:
{{CommandExecutor}} launches tasks wrapping them into {{sh -c}}. That means
signals are sent to the top process—that is {{sh -c}}—and not to the task
directly. Though {{SIGTERM}} is propagated by {{sh -c}} down the process tree,
if the task is unresponsive to {{SIGTERM}}, {{sh -c}} terminates reporting
success to the {{CommandExecutor}}, rendering the task detached from the parent
process and still running. Because the {{CommandExecutor}} thinks the command
terminated normally, its OS process exits normally and may not trigger
containerizer's escalation which destroys cgroups.
Here is the test related to this issue:
[https://gist.github.com/rukletsov/3f19ecc7389fa51e65c0]. As expected, it fails
on Linux, but surprisingly, it works on Mac OS 10.9.4.
> Sending SIGTERM to a task command may render it orphaned
> --------------------------------------------------------
>
> Key: MESOS-1871
> URL: https://issues.apache.org/jira/browse/MESOS-1871
> Project: Mesos
> Issue Type: Bug
> Components: slave
> Reporter: Alexander Rukletsov
>
> {{CommandExecutor}} launches tasks wrapping them into {{sh -c}}. That means
> signals are sent to the top process—that is {{sh -c}}—and not to the task
> directly. Though {{SIGTERM}} is propagated by {{sh -c}} down the process
> tree, if the task is unresponsive to {{SIGTERM}}, {{sh -c}} terminates
> reporting success to the {{CommandExecutor}}, rendering the task detached
> from the parent process and still running. Because the {{CommandExecutor}}
> thinks the command terminated normally, its OS process exits normally and may
> not trigger containerizer's escalation which destroys cgroups.
> Here is the test related to this issue:
> [https://gist.github.com/rukletsov/3f19ecc7389fa51e65c0].
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