[jira] [Created] (MESOS-8631) Can't start a task with every CPU on a Windows machine

["Andrew Schwartzmeyer (JIRA)" <ji...@apache.org>]

Andrew Schwartzmeyer created MESOS-8631:
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             Summary: Can't start a task with every CPU on a Windows machine
                 Key: MESOS-8631
                 URL: https://issues.apache.org/jira/browse/MESOS-8631
             Project: Mesos
          Issue Type: Bug
    Affects Versions: 1.5.0
         Environment: Windows 10 using the CPU isolator
            Reporter: Andrew Schwartzmeyer
            Assignee: Andrew Schwartzmeyer
             Fix For: 1.5.1


We have an edge case that existing unit tests don't cover: starting a single task which consumes every reported CPU. The problem is that the executor overcommits by 0.1 CPUs, so when we go to set the CPU limit, on say a 12 core machine, we set it to 12.1/12 * 10000 CPU cycles, which results in an invalid number of cycles (10,083, but the max is 10,000).

We were bounds-checking the minimum (1 cycle) but not the maximum, as the function did not expect the user to request more CPUs than available.

We'll fix this by checking the max bound. So if, for example, 12.1 CPUs are requested, re set the limit to 10000 CPU cycles, no more.



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