+++ This bug was initially created as a clone of Bug #1218060 +++

Description of problem:
=======================
Initialising snap_scheduler from all nodes at the same time should fail with proper error message - "Another snap scheduler command is running"

Version-Release number of selected component (if applicable):
==============================================================
glusterfs 3.7.0beta1 built on May  1 2015

How reproducible:
=================
always

Steps to Reproduce:
===================
1.Create a dist rep volume and mount it.

2.Create another shared storage volume and mount it under /var/run/gluster/shared_storage

3.Initialise snap scheduler at the same time from all nodes 

NOde1: 
~~~~~
snap_scheduler.py init
snap_scheduler: Successfully inited snapshot scheduler for this node

Node2, Node3, Node4 : 
~~~~~~~~~~~~~~~~~~~~
snap_scheduler.py init
Traceback (most recent call last):
  File "/usr/sbin/snap_scheduler.py", line 574, in <module>
    sys.exit(main())
  File "/usr/sbin/snap_scheduler.py", line 544, in main
    os.makedirs(LOCK_FILE_DIR)
  File "/usr/lib64/python2.6/os.py", line 157, in makedirs
    mkdir(name, mode)
OSError: [Errno 17] File exists: '/var/run/gluster/shared_storage/snaps/lock_files/'

It should fail with error : 
snap_scheduler: Another snap_scheduler command is running. Please try again after some time.

Actual results:


Expected results:


Additional info:

--- Additional comment from  on 2015-05-20 01:17:37 EDT ---

Same issue seen while checking snap_scheduler.py status from all nodes at the same time 

Node1:
======
snap_scheduler.py status
snap_scheduler: Snapshot scheduling status: Disabled

Node2,Node3, Node4:
===================
 snap_scheduler.py status
Traceback (most recent call last):
  File "/usr/sbin/snap_scheduler.py", line 575, in <module>
    sys.exit(main())
  File "/usr/sbin/snap_scheduler.py", line 545, in main
    os.makedirs(LOCK_FILE_DIR)
  File "/usr/lib64/python2.6/os.py", line 157, in makedirs
    mkdir(name, mode)
OSError: [Errno 17] File exists: '/var/run/gluster/shared_storage/snaps/lock_files/'