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https://issues.apache.org/jira/browse/MESOS-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15037152#comment-15037152
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Klaus Ma commented on MESOS-4049:
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I like {{replacement task}} feature :). Just want to confirm: in this JIRA,
Mesos only provide a new state about connection glitch ({{UNKNOWN}} or
{{WANDERING}}); "replacement task" is handled by framework.
> Allow user to control behavior of partitioned agents/tasks
> ----------------------------------------------------------
>
> Key: MESOS-4049
> URL: https://issues.apache.org/jira/browse/MESOS-4049
> Project: Mesos
> Issue Type: Improvement
> Components: master, slave
> Reporter: Neil Conway
> Labels: mesosphere
>
> At present, if an agent is partitioned away from the master, the master waits
> for a period of time (see MESOS-4048) before deciding that the agent is dead.
> Then it marks the agent as lost, sends {{TASK_LOST}} messages for all the
> tasks running on the agent, and instructs the agent to shutdown.
> Although this behavior is desirable for some/many users, it is not ideal for
> everyone. For example:
> * Some users might want to aggressively start a new replacement task (e.g.,
> after one or two ping timeouts are missed); then when the old copy of the
> task comes back, they might want to make an intelligent decision about how to
> reconcile this situation (e.g., kill old, kill new, allow both to continue
> running).
> * Some frameworks might want different behavior from other frameworks, or to
> treat some tasks differently from other tasks. For example, if a task has a
> huge amount of state that would need to be regenerated to spin up another
> instance, the user might want to wait longer before starting a new task to
> increase the chance that the old task will reappear.
> To do this, we'd need to change task state so that a task can go from
> {{RUNNING}} to a new state (say {{UNKNOWN}} or {{WANDERING}}), and then from
> that state back to {{RUNNING}} (or perhaps we could keep the current
> "mark-lost-after-timeout" behavior as an option, in which case {{UNKNOWN}}
> could also transition to {{LOST}}). The agent would also keep its old
> {{slaveId}} when it reconnects.
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