[jira] [Created] (MESOS-3029) Stout os::release returns unsortable version

["Paul Brett (JIRA)" <ji...@apache.org>]

Paul Brett created MESOS-3029:
---------------------------------

             Summary: Stout os::release returns unsortable version
                 Key: MESOS-3029
                 URL: https://issues.apache.org/jira/browse/MESOS-3029
             Project: Mesos
          Issue Type: Bug
            Reporter: Paul Brett
            Priority: Minor


When the Linux kernel version was incremented from 2.6.39 to 3.0.0 it was discovered that a few applications could not process kernel versions starting with anything but 2.x.  For compatibility, Red Hat and others mapped kernel version 3.n to 2.6.n+40.  

This introduces the interesting property that kernel 2.6.50 is later that kernel 3.9 but Version(2, 60, 50) is not greater that Version(3, 9, 0).  Since we want to be able to order kernel versions, we need to undo this mapping.

The following function is proposed for use in linux/perf.cpp to address this issue:

Version canonicalLinuxRelease(const Version& v) {
  if((v > Version(2, 6, 39)) && (v < Version(3, 0, 0))) {
    return Version(3, v.patchVersion-40, 0);
  }
  return v;
}

We could either add this to stout/os.hpp or add a custom sort order to Version (which we might need later when we generalize it).



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