Vinod Kone created MESOS-1807:
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Summary: Disallow executors with cpu only or memory only resources
Key: MESOS-1807
URL: https://issues.apache.org/jira/browse/MESOS-1807
Project: Mesos
Issue Type: Improvement
Reporter: Vinod Kone
Currently master allows executors to be launched with either only cpus or only
memory but we shouldn't allow that.
This is because executor is an actual unix process that is launched by the
slave. If an executor doesn't specify cpus, what should do the cpu limits be
for that executor when there are no tasks running on it? If no cpu limits are
set then it might starve other executors/tasks on the slave violating isolation
guarantees. Same goes with memory. Moreover, the current containerizer/isolator
code will throw failures when using such an executor, e.g., when the last task
on the executor finishes and Containerizer::update() is called with 0 cpus or 0
mem.
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