This hardens the code with respect to a race condtion if the
  slurmctld restarts and a burts buffer creation for a job is
  in progress. Eliminate the possibility of a duplicate job
  allocation record.

No change in functionality, just moved function call and added
  comment

Only execute the DataWarp real_size function if there is a job burst buffer. Calling the function if the job only references persistent buffers generates an error that is not useful

Wrong argument type

Preserve variable resp_msg for use in error message and use a different
  variable for temporary storage.

Fix gang scheduling and license release logic if single node job killed on
    bad node. Notifying gang and releasing licences is normally done when
    the epilog completion happens, but if the node(s) assigned to a job are
    all down, that does not happen. This results in the licenses being
    reserved indefinitely and the gang scheduler being left with a bad
    (old) job pointer that can result in various failure modes
bug 2867

Add hotels. Other minor changes.

anyway to attempt to log the backtraces of the potential
unkillable processes.

667f1105.

Used wrong symbol name in commit c4e34cb9
a few hours ago

Match sessions and instances using new DataWarp data format

correction to logic in commit c0919263

Move the real_size function to after the buffer has been setup
  per cray documentation

We have decided to go back to the way 15.08 called NHC instead of calling
it first before sending a SIGKILL to the steps tasks.  With this patch we
only start the NHC early when we have to resend the SIGKILL for unkillable
processes.  This will hopefully get us the backtrace of the unkillable
processes which was the reason we did it this way in the first place :).

processes.

job array scripts were not being found in some cases

Don't treat an old version of dw_wlm_cli which does not support the
  real_size function as an error. Just log it using debug.

The Cray burst buffer (DataWarp) API syntax has changed. Modify test
  to work with new syntax.

Test system with old kernel doesn't define O_CLOEXEC, so partially
  revert commit b1ca7526

Bug 2892.

Bug 2874

We will most likely redo this logic (as it appears to be duplicated) in
a following patch.

bug 1884

No changes in logic

Don't generate an error when a batch job is submitted that must wait
  for stage-in before starting.

Bug 2886

Add new SchedulerParameters option of bb_array_stage_cnt=# to indicate
    how many pending tasks of a job array should be made available for burst
    buffer resource allocation.
bug 1884