crowbar/barclamp-crowbar — pull request #920 by bkutil (2014-02-07 21:26:26+00:00)
Title: Fix potential race condition in node update

Refs BNC#861527

Processes:

A | B
------------------------------ | ---------------------
Enters locked block | Spins on the lock
Loads node info X |
Modifies node info X+a |
Exits locked block | Enters locked block
| Loads node info X
Saves node info X+a | Modifies node info X+b
| Exits locked block
|Saves node info X+b

Expected behavior is that B already works with updated info X+a.