There's a recent change regarding the picking of which launcher (Linux or Posix) to use
In our environment, cgroups are not auto-mounted after reboot. We rely on Mesos itself to mount all relevant cgroups hierachies.
After the reboot, the above patch detects that 'freezer' hierarchy is not mounted, therefore, decided to use the Posix launcher (if --launcher is not specified explictly).
Port mapping isolator requires network namespace to be created for each container (thus requires Linux launcher). But we don't have a check to verify that launcher and isolators are compatible.
Slave thus starts fine and task failed with weird error like:
It does take us quite a few time to figure out the root cause.